resonant circuits and introduction to vacuum tubes
TRANSCRIPT
DOCUMENT RESUME
ED 095 351 CE 001 908
TITLE Resonant Circuits and Introduction to Vacuum Tubes,Industrial Electronics 2: 9325.03. Course Outline.
INSTITUTION Dade County Public Schools, Miami, Fla.PUB DATE 71NOTE 36p.; An Authorized Course of Instruction for the
Quinmester Program
EPPS PPICE MF-$0.75 HC-$1.85 PLUS POSTAGEDESCRIPTORS Behavioral Objectives; *Course Content; Course
Organization; *Curriculum Guides; *Electric Circuits;*Electronics; Grade 11; Secondary Grades; TechnicalEducation
IDENTIFIERS *Quinmester Program; Vacuum Tubes
ABSTRACTThe 135 clock-hour course for the 11th year consists
of outlines for blocks of instruction on series resonant circuits,parallel resonant circuits, transformer theory and application,vacuum tube fundamentals, diode vacuum tubes, triode tubeconstruction and parameters, vacuum tube tetrodes and pentodes,beam-power and multisection tubes, and multigrid and special purposetubes. Behavioral obpctives are listed. A 19-item bibliography ofreferences and films is included together with a posttest sample.(AG)
I ;
SCSI-
AUTHORIZED COURSE OF INSTRUCTION FOR THE Q U
0)000
Course OutlineRESONANT CIRCUITS AND INTRODUCTION
TO VACUUM TUBES(Industrial Electronics 2 - 9325)Department 48 - Course 9325.03
U S DEPARTMENT OF HEALTH.EDUCATION I. WELFARENATIONAL INSTITUTE OF
EDUCATION-I, tiNtl NT HAS At- F N UFPUOOWt O f xiar ti r AS WFCEIVI O f WO*THE Pf W,ONOu OucoNt4i/ATION ORIGINATING IT POINTS v1FNOR OPINIONSSTATFD DO NOT NECESSAPIL v REPPESENT Or r IC,Pt NATIONAL INSTITUTE OFF tP,t' At ION P0',!T ION OP POt
DIVISION OF INSTRUCTION1971
r-4
Pr\LCNCT ADE COUNTY PUBLIC SCHOOLS
1 4 1 0 NORTHEAST SECOND AVENUELLi
p
MIAMI, FLORIDA 33132
Course Outline
INDUSTRIAL ELECTRONICS 2 - 9325(Resonant Circuits and Introduction to Vacuum Tubes)
Department 48 - Course 9325.03
*"
I; :
; , . :
the division of
VOCATIONAL, TECHNICAL AND ADULT EDUCATION
DADE COUNTY SCHOOL BOARD
Mr. William Lehman, ChairmanMr. G. Holmes Braddock, Vice-Chairman
Mrs. Ethel BeckhamMrs. Crutcher Harrison
Mrs. Anna Brenner MeyersDr. Ben Sheppard
Mr. William H. Turner
Dr. E. L. Whigham, Superintendent of SchoolsDade County Public Schools
Miami. Florida 33132
Published by the Dade County School Board
Course Description
Resonant Circuits and9325 48 9325.03 Introduction to Vacuum Tubes
NEWe Category County Dept. County Course Course TitleNumber Number Number
This course of study includes Series Resonant Circuits, Parallel ResonantCircuits, Transformer Theory and Application, Vacuum Tube Fundamentals,The Diode Vacuum Tube, Triode Tube Construction and Static Characteristics,Triode Tube Parameters, Vacuum Tube Tetrodes and Pentodes, Beam-Power andMultisection Tubes, and Multigrid and Special Purpose Tubes.
The Laboratory Experiments .elating to the text material will be covered.
Clock Hours: 135
PREFACE
The following pages contain a course outline entitled
Resonance Circuits and Introduction to Vacuum Tubes. This is
the third quinmester course of the eleventh year course No.
9325. There will be four more quinmesters as follows:
9325.01 Basic ElJotrical Concepts and D.C. Circnits9325.02 D. C. Circuits and Introduction to A. C.9325.04 Semiconductors9325.05 Independent Study in Electronics
This quinmester course will be available to all students
who satisfactorily complete the post test of quinmester 9325.
02.
This course material is presented to the student in 135
hours of classroom-laboratory instruction. The content of
this course will be covered in ten blocks and concluded by a
post test.
Upon completion of this course the student will be well
grounded in the areas of resonant circuits, transformers, and
vacuum tube fundamentals.
The teaching methods will vary according to the ability
of the individual student. As the content of the course
varies, teaching techniques which lend themselves to each
particular situation are employed. The instructor uses demon-
strations and lectures which are supplemented by the perfor-
mance of laboratory experiments and assignments by the student.
The instruction is further developed by the use of films, in-
formation sheets, diagrams, and other aids which make the
instruction more meaningful.
Me outline wls developed throe: ;11 the cooperative efforts
of eli.:ctronic instructors, supervisory rersonnel, the Quin-
mester Advisory Committee, and the Teacher Training Service,
Dade County Public Schools, Division of Vocational, Technical
and Adult Education, and has been approved by the Dade County
Vocational Curriculum Committee.
ii
TA BL:: OF CONTEETSwith Suggested Hourly Breakdown
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Page
PREFACE. . ********** ******** iCOALS. . 0 ******** vSPECIFIC BLOCK OBJECTIVES. OOOOO viBIBLIOCRAPHY OOOOOO 7
9 BLOCK
a
I.
II.
SERIES RESONANT CIRCUIT (12 Hours)The Series Tuned CircuitQuality OOOOO OOOOO OOOOOBandwidth OOOOOAnalysis of Series Resonant Circuits . . .
Series Resonant Circuit Applications
PARALLEL RESONANT CIRCUITS (12 Hours)Parallel L-C CircuitsCirculatin7, Current in an Ideal Parallel
Resonant Circuit OOOOO
.
.
1
1
1
1
1
1
1Practical Tuned Circuit Anelysis .
Parallel Resonant Circuit q and Bandwidth .
Applications of Series and Parallel TunetlCircuits in Combin tion OOOOO 2
III. TRANSFORMER THEORY AED APPLICATION (15 Hours)Transformer Action -)
,.
Turns Ratio . OOOOOOOOO . OOOOO 2Impedance Matchinv,Transformer Losses and Transformer
2
Ratings OOOOOOOOOOOOOO 2Power Transformers OOOOO . 2Audio Transformers 2Radio-Frequency Transformers . ?Special Applications of Transformers . . 3
IV. VACUUM TUBE FUNDAMENTALS (6 Hours)Electron Emission OOOOOOO 3The Emitter OOOOOOOONsitter Construction . OOOOOO 3
V. THE DIODE VACUUM TUBE (12 Hours)Physical Construction *******Theory of OperationStatic CharacteristicsDynamic Characteristics
iii
33
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VI. TRIODE Tilh CON3TWICTIOV AND STATIC CiiAitMTWRI3TICS(15 hour;:)Triode Construction and Plato Currant
Control 4Grid Control ******** 4Static Characteristics . 4Bias In A Triode Tube Circuit . 4Types of Bias *** ** 4.
VII . TRIODE TUBE PARAI.MTERS (18 Hours)The Triode Amplifier Circuit 4Tube Constants ***** 4Dynamic Characteristics OOOOO 4The Dynamic Transfer Curve 4Classes of Operation OOOO 4
IIIII. VACUUM TUBE TETRODES AND PENTODES (12 Hours)Tetrodes ******* 5Tetrode Tube Constants OOOOOO 5Pentodes 5
Ix. BEAM-POWER AND MULTISECTION TUBES (9 Hours)Beam Power Tubes . . . . . . . . O 5The Duo -diode 5The Diode-Triode OOOOO 5The Dial Triode OOOOO 5
A. MULTIGRID AND SPECIAL PURPOSE TUBES (24 Hours)Multigrid Tubes 5Subminiature, Gas-filled and Thyratron
Tubes OOOOOOOOOO 5Phototubes and Electron -Ray Indicators . . 6The Cathode Ray TubeHigh-frequency Tubes
XI. IIINKESTER POST TEST
APPEUDL. - POST TEST SAMPLE .
iv
. 6
. 6
10
C. ALS
he student technici will be able to:BEST COPY AVAILABLE
1. Demonstrate an underst!:ndinj of tuned circuits.
2. Demonstrate an under:: tending of transfcrner theory andnpplication.
Demonstr9te undrIlt!tnding of the b,sic fundamentalsof vacuum tubes including, the diode, triode, and pentode.
4. Demonstrote an understanding of vacuum tube characteris-tic curves and parameters.
Demonstrate an understanding of special purpose tubessuch as tubes, thyraton tubes, phototubes, cathode-lfytubes, and high frequency tubes.
6. Satisfactorily comtlete the post test.
sr nIFIc AOC:. OV.Trri:E3
:31 0C!. 1 CTIO: 1T3 IN COPY AMULABLE
Thf! ntmlent will 1n rible to:
1. the Ihnor:' of aeries Heaonnnce In terma orrenetnnce, resistance, voltage and current.
2. Demonstrate In understandiw. of 1, its effect onbandwidth, voltages, and current.Explain nprlications of Series Resonant circuits nstunic. ; - devices, band pass and band-reject filters.
14. Calculnte resonant frequency, reactances, bandwidthand 1.
BLOW: II - PARALLEL 11%3OLANT CLICUITS
The student will be able to:
1. amain the theory of Parnliel Resonance in terms ofreactance, resistance, voltage and current.
2. Demonstrate tIn understanding of Q, its effect on band-width, voltages, and current.
applications of Parnllel Resonant circuits -ntuning devices, band pass and band-reject filters.
4. Calculate resonant frequency, reactances, bandwidthand 0.
5. Demonstrate an understanding of prnetical applicationof Parallel Resonant circuits and combination series -parallel reeonnnt circuits.
BLOCK III - TR;14SFORMER THEORY AND APPLIC:.TIOL
The student will be able to:
1. Demonstrate an understanding of transformer °porn-tion and solve problems related to turns, voltni...e,current, and impedance ratio.Identify and explain applications of various typesof transformers and their construction.
BLOCE IV - VACUUM TUBE FUNDAMELTALS
The stuuent will be able to:
1. List four types of electron emission, and two typesof commonly used cathodes for thermionic emission.
vi
es1 f cii;
ntwk:nt. '411' Lu i,Lo tO:
1 E in Lt f t'Oet.1041 I'MtilOtit! V' Clitit tube.. ...;:r.erimontal 1 y dor ive :;i. tintic curves raid A.C. 'lid D.C.
. Demonstrate nn understardinrrectifier emplicstions.
LAST COPY AVAILABLE
nif,101 C1:1:111
ind (ijretrLie uivieteri -pll te resistnnce.of the use of diodes in
mocK ' :1 - TRICD2 TU3E CO::STRUCTIO:: ALL) S'1ATIC CHARCTI:LiISTICS
The student will be able to:
1. 1.;:::..01nin the construction .and theor:7 ofeoperntiori ofa triode vacuum tube.f. 11;perimentally derive static charcterictic curvesof a triode vacuum tube.
";. Demonstrate an understandin-: of bias and list tilre,methods of obtaining; bias.
71';. TUBE P1RW7TE11S
studert will be able to:
1. ,x.rlain the operation of a triode implifier includinginput and output relationships.Explain, derive, and solve problems related to thethree triode tube parameters.Construct load lines, dynamic transfer curves, indr:raphically predict the operation of triode vcuumtube amplifiers.
h. tist the four classes of amplifier operntioneach.
BfOIK 7T11 - VACUUM TUBE IETROZES AND PENTODES
The student will be able to:
1. the construction Ind theory of operation oftetrode and pentode vacuum tube.
2. :xrlain, derive and solve problems. related to thethree tetrode and pentode parameters.3. Construct load lines, dynamic transfer curves, andgraphically product the operation of a pentodevacuum tube.
vii
BEST COPY AVAILABLE
1.. - TC1.11.::: AND Nil:,TI:3::CT101:
The otutient will be ^bl o to:
I. :.4.)1 ..in t.:(1, construction nnd thoor of oVbenm rower tube.Use fe=mi1 7 of curves to solve beer: power !mintier-roblems.
. Demonstrate to understandinc of multisection tubes.
BLOU - Sr-ICIAL PURPOSE TUBES
The student will be .ble to:
1, azpletin the construction and theory of operation ofmulti7rid tubes, subminiature tubes, VR tubes,thyrnton tubes, phototubes, electron -ray indicatortabes, cathode-ray tubes, and high frequency tubes.
viii
Course OutlineBEST COPY AVAILABLE
INDUSTRIAL ELRCTRONICS 2 . 9325(Resonant Circuits and Introduction to Vacuum Tubes)
Department 48 - Course 9325.03
I. SER1'.:3 &ZOnECE CIRCUIT
A. %he Series Tuned Circuit1. hesonnnce
The reaonnnce curveslenern1 rule for A-L-C circuit
it.. The series reson:nce circuit current curves
B. ,).tality
1. Sample calculation of2. "unity nnd the series resonant circuit current
curve
C. 3.tndwidth1. Frequency and bandwidth
end bandwidthFormula for bandwidth
D. !.nalysis of Series Resonant Circuits1. The resonant frequency
The ". of the circuitThe bandwidth
4. Voltage rain7arintion in circuit properties
Series -iesonant Circuit Applications1. The b:nd-pPss series resonant network2. Thu Land-reject series resonant network
II. Pit<-L hESOYALT CIRCUITS
Isrrllel L-C Circuits1. Circuit analysis
Resonance curvesReactance curves
4. Line current curve5. Impedance curve
r:. Circulating current in an Ideal ParIllel ResonantCircuit1. Ideal cirauit analysis at resonance!?. Ideal circuit analysis at frequencies other than
resonPnce
-1
,..,ctier.1 Tuned v:Irnuit1. :tesist.Lnce in vrncticr.1 BEST COPY AVAILABLE
Anrlysis
Hesonnt Circuit .;rd .Indwidth1. Circuit -2. Circuit bandwidth
Apnlicettions of Seri cu and Parallel Tuned Circuitsin Conbination1. "mplications of parrAlel tuned circuits
.'.pplications of series and parallel tuned cir-cuits in combinition
*/. ..;:ample of a series and parallel tuned circuit
ill. TRAL3FORM:13 Tnaltr: AND APPLICATION
A. Trnnsformer action1. Coefficient of couplinr:2. Phase relationships3. Effects of the secondary on tho primnry of -
transformerI. Phase angles in n transformer
Turns Ratio1. Relationship between voltage and turns ratio?. Relationship between power in the primary *nd
power in the secondary?. Relationship between current and turns ratio
Inredance Matchin!'1. Reflected impedance
Reflectod capacitance and inductance
D. Iransforner Tosses and Trnnsformer Rstinrs1. Copper loss
Hystersis loss3. S!,turation lossh. Eddy current lose
lower Transformers1. Filament transformers
Mpred winding transformers3. windin- transformerE. ,iltetransformer
itclio Transformers1. Input transformer
Interstage transformerCutput transformer
:-d10-?roouerc:7 REST CORY AVAILABLE1. interct2:.0 trnnsfortrrnsformor
%ntenn:1 u:Z.h 3 tr:Ansformers
Le vIntic-tiona of Trnnsformers1. Isolation trrnsformers71. instrument transforl.:erc
Potential trrnsformers4. Current transformer
riaturable rector41
nr. V tin: ri7 PLTDA11:IITATS
. ';lectron emission1. 'Zhermionic fission'7'. Cold-cathode emission
rhotoelectric emission3econdar emissior.
3. The .emitter
C. .sitter Construction1. Directly heated cathode2. Indirectly hosted onthode
DIO DT: T:CrUli TT 61::
A. Physlcal Construction1. 3ase
CrthodePrto
h. .11velope
Theor7 of Orerntion1. Space Chtrce
CurrentPeak Inverse Plate Volta7e
P Static Characteristics1. Static curver". Saturation
D-C plate resistanceA-C resistance
D721-mic Characteristics1. Diode load resistor
Dynamic curveDynamic operation .nd rnrlications
. Half-wave rectifierb. 21111-wave rectifier
VY. TWIOD; COEXIWCTICV ALD Tr TIC CIIARACT::AlfAiC6
Triode Construction and pl.:%tc Curroi.t Control1. rhysienl construction
(:id control.:ero
b. ;:o connectionc. Positive volt ": e
BEST COPY AVAILAbud. Ne:;ative voltnce
3trstic Characteristics1. Tinte family of curves2. Crid fetmily of curves
C. :Arts In A Triode Tube Circuit
D. Types of 7ias1. 171::od
P. Cathode3. :rid-loniz1!.. Contr,ct
VII. TSIOD: TU7;2. PA.HAMETELQ,
*k. The Triode Amplifier Circuit1, Amplificntion2. Input and output signals3. Phase4. VoltaGe gain
Tube Constants1. Anplification factor2. Transconductance3. Plate resistance
C. Dynamic Characteristics
D. The Dynamic Trnnsfor Curve1. Construction of the curve2. Slope of tho curve1. Linearity of the curve4. Cain formulas
Classes of Amplifier Operation1. Class A2. Class B
Class ABL. Class C
VIII. VP434U1-: TIM.; Tfri-101X.3 PELTOMS
. Tetrodes1. Construction
Voltirc connections3. Acctrostatic fields4. Plato characteristic curves
B. Tetrode Tube Constants1. 1-C plate resistnnee2. Anplification factor7. Trnnsconductance
C. Pentodes1. Construction2. Plate characteristic curve3. Dynamic characteristics4. Clr.ssification
BnE-POIT21.1 AKD MULTISECTION TUBES
isEST COPY AVAILABLE
A. Beam power tubes1. Construction2. The virtual cathode-. Dynamic load lines md transfer curves
Distortion5. Applications
B. The Duo-diode
C. The Diode-Triode
The Dual Triode
I'ULTIGRID AED SP2CIAL PURPOSE TUBES
A. rulti3rid Tubes1. Structure of pentagrid tubes2. Frequency conversion
a. The pentagrid mixerb. The pentagrid converter
B. Subminiature, ('as- filled and Thyratron Tubes1. Subminiature tubes2. Gas-filled rezlulator tubes". VR tubes4. Thyratron tubes
f 6 :lototubon -nd _Joctron-;t ^;;
1. IllototubouConstruction
b. 3onsitIvityc. DistortionU. Photomultip!lorsG. !1pplio7.tions
indientors
The C!:thodo arty Tub()1, ::Itrvoture
Yocusin.7 d nocolorntin thu beanDoneotion
'2ootrostnticb. 7nootromnotic
Hi:h-froquoncy Tubes1. '.corn tubes2. ..1rhtliouse tubes3. Tho ystron
. I: :
BEST COPY AVAILABLE
0.3(.1r. r.::
.ric
BEST COPY AVAILABLE
1. ::\Anci%mentrls : . _3at ....ralck C', CircuitzVol. IIIL.co Corporation, 19u6.
r. ::iunlenent to 7-`uncinr.entz.1z of A. C. rend C. Cir-cultz Vol...nrl.rs.Ln. 7.1. 11 1rde1thi:4:-e57,77711on, 1963.
`.'.1'a ca Seniconducto :Aandmentnis. Vol. .J1.rhInTOTFEE771inG7777553;11717719 9.
3.4nnlenent to Vaculwl Tube :zd Semiconductor Pundn-yelE31.1. von III. Pi...ao..nneicocor-por.71"Mn, 196c..
K. Coo::e, Lolson !:e.thematics for i0.ectronic:.:.2nd ou. "7ork: 300k Company, irc .
1960. Fn. 617.
u. :,thaticr.. for illectronico. :.st od. Count::.iublic : :shoo =s, 1970.
7. :student 2cetro _co :Eandbook. Da- do County PublicSe.lools, 19.9.
Supplementary References:
8. Suffern, Vaurice n. 3nsic Electrical and ElectronicPrinciples. 3rd ed.NetW-HI3ockCompany, Inc., 1962. Pp. 604.
7*t.Departement of the Air Force. FUndamentis oVElectronics (Af) Manual 101-8) Waratun, D. C.:U. S. Government Printing Office, 1957.
'. °p Ip 1.148.
IC. United States Department of the Army. Basic Theoryand 4pplication of Elq9tron :ubes. (TN 11,661).Washington, D. C. : United7States C;overnment Print-ing Office, 1952. Fp. 215.
RFST Cnny AV AILAI3LE
:11T1 Or der']
!umber
Pilmr:
11. .;.trinut.: Tubc: iiow It 1
-----17717777717---Sound. 190. UnItPdWorld Film, Inc.
12. Diode Principles and Applications. 16 mm.17 min. B/W Sound. 1-945. UnitedWorld Films, Inc.
1-12974
1-129d
11 Electromagnetic Cathode 42yTube. Theora.of Operation. 16 mm. 20 min. B/WSound. 1958. United World Fi]ms, Inm.1-11'07
lh. Frincioles of r;as Filled Tubes. 16 mm.15 min. B/W. Sound. United worldFilms, Inc.
15. Ihotoelectric Effect. 16 mm. 30 min.Big. Sound. 1962. ncyclopediaBritannica Films, Inc.
16. Television Picture Tube Lm losions. 16 mm.10 min. B W. Sound. 19 IowaState College, Visual InstructionService.
1-107-17
1-05587
17. T'Aned Circuits. 16 mm. 28 min. B/W.Sound. 1543. United World Films, Inc.1-.
Ifacuum Tubes: Electron Theor and DiodeTubes. 1 mm. 1 n. B W. Sound.9477 United World Films, Inc. 1 -1 -J1 74
1c. Vacuum Tubes: rlriode and Multi u oseTubes. 1 mm. 1 m n. B W. Sound.TWf: United World Films, Inc. 1-1"-192
fkFIQulnmester Post Test Sample
POST TESTfor
C1:1CMS %2D INT;i0DUC5ici9325.0
1. At the resonant frequency, - series R-L-C circuit appearsas a (nn)a. or.en circuitb. resistive circuitc. short circuitd. reactive circuit
2. In n series-resonant circuit the capncitive reactance i:::a. maximumb. minimumc. eclual to the inductive reactanced. in phase with the inductive reactance
3. A series resonant circuit contains an of 100 ohms, anof 100 ohms, and an R of 10 ohms. Its the applied vol-
tage is 100 volts, what is the voltage across the induc-tor':
a. erk-) voltsb. 1G0 voltsc. 141 voltsd. 1000 volts
L. The current at resonance in a series R-L-C circuit is oneampere. The current at the half-power points is:a. 1.5 amperesb. 1.414 amneresc. 500 milliamperesd. 707 milliamperes
5. If the . of a circuit is 12 and the resonant frequency is9.6 mc, whit is the bandwidth?a. 10.L mcb. 800 kcc. 8.8 mcd. kc
6. the effect of adding resistance to a series resonant cir-cuit is to:f-l decrease the resonant frequencyb. increase the discrimination of the circuitc. broaden the frequency responsed. increase the voltage across the circuit
7. The bandwidth of a series resonant R-L-C circuit:n. vflries directly asb. v,Iriec inversely as the resistancec. is not related tod. vr%ries directly as the resistance
-10-
8. in wirallel circuit, one branch nontnins nr or 9Johms, the second branch an :4, of 90 ullms, and the thirdbranch is resistive.The total circuit impedance is:a. inductiveb. resistivec. inductive and resistived. capacitive and resistive
9. At parallel resonance:a. circuit impedance is minimumb. circuit current is minimumc. the circuit is inductived. the circuit is capacitive
8tCOPY
AVAILABLE
10. A pnrallel resonant circuit is often referred to as:a. an ideal circuitb. a tank circuitc. a complex circuitd. a reflex circuit
11. In a parallel resonant circuit, at resonance, the impe-dance is:a. maximumb. minimumc. equal to the resistance of the circuitd. equal to the reactance of the circuit
12. In a parallel resonant circuit, at resonance, the linecurrent is:a. maximumb. minimumc. 180° out of phase with applied voltaged. 900 out of phase with the applied voltage
1=. In a parallel resonant circuit, at resonance, the circu-latinr current is:a. maximumb. minimumc. equal to the line currentd. there is no circulating current
14. A parallel circuit at resonance is characterized by:n. high circuit currentb. high branch currentc. hi!her voltage than applied voltaged. low branch voltage
15. Mn a parallel tank circuit, the generator is tuned belowits resonant frequency, the total impedance is:a. decreased and inductiveb. increased and capacitivec. decreased and capacitived. increased and inductive
circuit
AVAILABLE
16. Circuit current in a practien1 parallel resonant cis never ;:ero because:a. rrictical circuits are never resonant BEST OPY
b. every circuit component has some resistancec. current is constantly bein exchanged between T. and C(I. reactc.neo never reaches nn absolute minimum
17. In n 11.)rallel resonant circuit, the ;enerator Is operatingabove resonance, the phase angle is positive because thecircuit nets like (an):a. inductance in series with a resistorb. resistorc. capacitor in series with a resistord. inductance
18. In tunin7; a hich-r1 parallel tank circuit from the pointof resonance, the line- current meter would:a. h-ve n sharpe rise in readingb. have no change in reading:c. read zerod. have a sharp drop in readinc
19. The inductive reactance of n parallel resonant circuit is4800 ohms. If the resistance of the coil is 160 ohms,what is the q of the circuit?a. T3b. 20c. 76.5d. 130
?O. A parallel circuit resonant at 115 mc has a bandwidth of300 kc. In order to double the bandwidth, the q of thecircuit should be:n.
b. 72c. 92d. 144
21. What is the resonant frequency of a parallel cir-cuit if the capacitance is 1 micro-microfarad and theinductance is 1 microbenry?-. 61 mc.b. 159 mc.c. 1000 mc.a. 6250 me.
22. A parnllel circuit is resonant at 98 megacycles. If theof the circuit is 56, how wide is the bank of frequen-
cies it rejects?n. 99.75 mc.b. 0.57 me.c. 1.75 mc.d. 96.25 mc.
-12-
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21. in aeries circuit, = a.5 nh, .11 ufd,a - 46 ohms, frn. '11.9 Minb. -14 iii ,,,
c.d. 15.7 LII:;
24. In a nlrallel circuit;, .1 ufd, Cr = 1.77 KHz,R = 150 ohms, Ln. ,3("i mh
b. mhc. 2.":1 mh
d. 126 uh
25. In a parallel R-L-C circuit, F. = 20 uh, C = 43.1 uufd,R = /1. ohms, fr =a. 160 nizb. 2360c. 1600 KHnd. 2.1 MHz
26. If the phase angles between the voltnCe Pild current areHero in a transformer, the transformer is connected to r:no resistive and capacitive loadb. resistive and inductive loadc. resistive to <dd. capacitive bid
; ?7. The major difference between an autotransformer and n
conventional transformer is:the use of an iron core
b. step-wo possibilitiesc. copper lossesd. the use of only one windinc
23. In a conventional transformer, power is transferred fromthe primary to the secondary by:n. self-inductionb. conductionc. mutual-inductiond. transconductance
29. A center-tapped transformer secondary is usually used to:rto obtain a high and low value of secondary voltailt
from a single-voltage sourceb. deliver two equal voltages of opposite phasec. double the voltage available at the secondary of thc;
transformerd. deliver two equal in-phase voltages
30. ener7y is transferred from one circuit to onotherMien impedance of the source:f). oqu!As the impodnnce of the 'loadb. Is ,.renter tirin the imnednnce of the lor,0c. lc '(%;t; tLin the imedance of the le!!li 8E,Si COPY AVAILABLEd. twist ton tirloo tilt' impethince or ti o
M. Copper looses !Ire:n . losses due to the corn materinlb. losses due to magneti7.in!: effectsc. D. C. resistance lossesd. A. C. resistance losses
.;c1cly currents are:9. currents set up in the core of the transformerb. out of rhase currents in the secondaryc. current flowin in the primary when the secondnry is
unlodedd. current flowim; in the secondary when no current flow:,
in the primnry
iTysteresis is:n . heat loss in a transformerb. loss due to loose laminationsc. 1-:;cin7 of the density behind the magnet:U..1,n.:
forced. loss due to use of wire too smell to handle current
31L. autotransformer is:. rs..n automatic transformer
b. designed to be used only in automobilesc. r transformer designed with only one windircd. n trinsformer with multiple windings
K. The nowor r-tiir of trnnsformers is Oxen ir either tvq.t:or voltnmneres. Power in watts is equal to
b. cos 00. sin 0d.
16. If the resistance in the secondary of a power transformcris decronced, the current in the nrimary will:n . rennin the sameb. decreasec. increased. shift in phase from the volts fie
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37. A power :,1101fier hns nr imr,cdrinee of V6(!0 ohms. For amAimiun rower tr.,nsfer to rt voice voil_ of rt 6-ohm speaker,the riltchim tv,nsformr should hnve turns ratio of:
':' to 1b. 4C to 1c. 96 to 1d. 3100
3. A transformer no -load h.:s 110 volts rcres2 the primary,12 turns in the primary, and k0 turns in the secondary.The second:1'7 terminal voltage
voltsb. 3.66 voltsc. lac) voltsd. 146 volts
39. A transformer with no lossJs has 100 volts at 5 amperesnp-olied to the primary. With 250 volts output in thesecondary, what is the output current?n. 2 amperesb. 10 amperesc. 12 amperesd. 25 amperes
40. A transofission line has an output impedance of 2500 ohms.For ma;:imum rower transfer to a 100-ohm load, the matchingtransformer should have a:a. 5 to 1 step-down ratiob. 5 to 1 step-up ratioc. 25 to 1 step-down ratiod. 25 to 1 step-up ratio
41. The primary of a power transformer draws 4.6 amperes at110 volts from the line, while the secondary has a loadconsuming; 2 amperes at 235 volts. What is the efficiencyof the transformer::ft. 93;;
b. 9.29%c. 955d. 1.075;
42. ! filter passes signals from nero to 150C cps and from7000 ens upward. The filter is called a:n. low-pass filterb. hi: II-pass filterc. band-Pass filterd. band-rejection filter
43. TIi imnednnce in the series-Inesonant br. 1:cl: of a band-p-ssfilter is:n. low in the rejection bandsb. low in the sass bandc. the same in the pass band as the impedance of the
parallel-reson-mt branch in the pass band.d. high in the pass band
44. What type of filter is usually used to eliminate the rip-ple from a rectifier power supply?a. low-pass filterb. high-pass filterc. band-mtss filterd. band-reject filter
45. Emission of electrons through the application of heat isknown as:a. photoelectric emissionb. cold cathode emissionc. secondary emissiond. thermionic emission
46. anission of electrons through the application of a hillnotential is known as:a. photoelectric emissionb. cold cathode emissionc. secondary emissiond. thermionic emission
47. Emission of electrons by the application of li:ht isknown as:a. thermionic emissionb. cold cathode missionc. photoelectric emissiond. secondary emission
46. Eiission of electrons through impact is known as:a. secondary emissionb. photoelectric emissionc. cold cathode emissiond. thermionic emission
49. The element within the v-cutup tube which emits electronsis called the:n. anodeb. getterc. cathoded. heater
5C. Me most efficient tyna of cathode is tile:a. tum.stenb. o;dde coatedc. thoriated tungstend. pure nickel
51. In a directly heated cathode:a. heatinc, must be with A. C. currentb. the heater and cathode are one and the samec. only tungsten may be usedd. the cathode is a metal cylinder
52. An indirectly heated cathode:n. requires longer warm up timeb. is usually mode of tungstenc. must use D. C. current onlyd. is seldom used in receiving type tubes
53. lunrsten and thoriated tungsten cathodes are usuallyused:a. in low power requirementsb. in hi,11 power requirementsc. in indirectly heated cathodesd. in tubes for uortable radios
54. A two element tube is called a:a. duo tubeb. diodec. rectifierd. static tube
55. In a vacuum tube, current is considered to flow from:a. rlate to cathodeb. heater to cathodec. cathode to plate
56. Flottin: variation in plate current vs. variation inplate voltage with the tube operating with no load willproduce a:a. dynamic characteristic curveb. static characteristic curvec. straight lined. e:Kponential curve
57. The D. C. plate resistance of a tube is:a. always constantb. expressed in ohm'sc. Ep/Ind.
58. Me A. C. r1::te resistince of !, tube is:1wnys constant
b. Et)/InC. De/did. linonr
1 As the load on a vacuum tubecharacteristic curve:a. becomes more curvedb. becomes strni.7-hterc. MA;:iMUM v!lue of currentd. causes a [Tent change in
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is increased, the dynamic
drawn increaseslord voltage
60. The ripple frequenc of a half-w'nve rectifier is:n. twice the input frequencyb. four tines the input frequencyc. equal to the innut frequent;;d. a sine wave
6. Rectification is:n. changini; D. C. to A. C.b. chancing A. C. to D. C.c. chanrin:- one frequency to another frequencyd. reactivatine the cathode to produce more electrons
62. A vacuum tube is said to be nefatively biased when:a. the control grid is positive with respect to the
cathodeb. the control grid is negative with respect to the
cathode.c. the control grid and the cathode are the same
rotentiald, the control grid is positive with respect to the
pTate
6. A vacuum tube will draw grid current when:. the control grid is negative with respect to the
cathodeb. the rlate is positive with respect to the enthodec. the plate is positive with respect to the control criud. the control grid is positive with respect to the
cathode
6b.. If the plate voltage of a triode is made more positive:n1.1te current will increase
b. plate current will decreesec. 7rid current will increased. there will be no effect on pl%te current
65. If the bins on the grid of a triode vacuum tube is mademore negative:a. the grid will draw currentb. pl :te current will decreasec. plate current will increased. there will be no effect at all
66. When the bias on a vacuum tube is increased to a pointwhere plate current no longer flows, this point is called:a. roint of no returnb. saturation pointc. cutoff pointd. limitinF point
67. The curves of a triode that show the relationship betweenplate voltage and plate current for constant values of agrid voltage are called:a. EgI curvesb. grid characteristic curvesc. static transfer characteristic curvesd. E -I. curves
68. Bias, obtained by returning the grid to a fixed source ofpotential, is called:a. grid-leak biasb. cathode biasc. fixed biasd. semiautomatic bias
69. A type of bias obtained by placing a resistor in thecathode circuit to make the cathode positive with rescectto the grid is called:a. grid -3eak biasb. cathode biasc. fixed biasd. resistor bias
70. The load resistance of an amplifier:a. controls the plate supply voltageb. controls the grid voltage signalc. has no effect on the gain of an amplifierd. has a marked effect on amplifier gain
71. The ratio of a change in plate voltage, which causes achange in plate current, to the change in grid voltagethat will cause the same change in plate current, iscalled:a. amplification factorb. transconductancec. plate resistanced. conversion transconductance
72. Amplification factor is also known as:a. gmb. rpc. mud. gain
7 . The ratio of a change in plate current to the change ingrid voltage, causing it at constant plate voltage, iscalled:a. amplification factorb. plate resistancec. transconductanced. conversion transconductance
74. The ratio of a change in pltite voltage to a correspondingchange in plate current is called:a. amplification factorb. transconductancec. conversion transconductanced. plate resistance
75. Transconductance is also known as:a. gmb. rpc. mud. gain
76. A graphical representation of the plate load resistancevalue drawn on the plate family of characteristic curvesis called:R. a tangent curveb. a load linec. a schematic diagramd. Ep - ip curve
77. A vacuum tube biased at approximately cutoff would beoperating:a. class Ab. class Bc. class Cd. class D
78. In a class A amplifier, current flows for:a. 180° of the cycleb. 3600 of the cyclec. 90° of the cycled. 100 of the cycle
79. A class C amplifier is biased:a. in the center of a linear portion of the curveb. at or near cutoffc. 1.5 to 4 times cutoffd. at zero
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80. The gain of an R C coupled vacuum tube amplifiera. is always greater than the mu of the tubeb. is always equal to the mu of the tubec. can never exceed the mu of the tubed. can never be less than one
81. The effect of the suppressor grid is achieved in a beampower tetrode by:a. the beam forming platesb. the virtual cathodec. using lower plate voltaged. using a suppressor grid but calling it another name
82. In a beam powerwhen:a. the load isb. the load isc. the load isd. the voltage
tube, maximum power output is obtained
equal to r,less than f,3 times r,amplification is greater than 100
83. A tube containing two diodes and one triode is called:a. duodiodeb. two diode-triodesc. duodiode-trioded. multipurpose tube
81. Limitations of the triode tube used as an amplifier athigh frequencies is caused by:a. insufficient emission from the cathodeb. interelectrode capacitancec. too small a grid structured. two low a mu
85. A four element tube is called a:a. triodeb. pentodec. dioded. tetrode
86. The region on the characteristic curve where an increasein plate voltage produces a decrease in plate current, iscalled:a. the setback regionb. the quiescent pointc. the dynatron regiond. the dynamic region
87. In comparison with a triode, the plate resistance of atetrode is:a. highb. lowc. the samed. none of the above.
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88. In comparison with a triode, the amplification factor of apentode is:a. highb. lowc. the samed. none of the above
89. The main drawback to a tetrode tube is:a. too hard to control plate currentb. too low a mu to be practicalc. secondary emissiond. all of the above
90. The effects of secondary emission are minimized by theaddition of an additional grid in the tube. This gridis called:a. screen gridb. secondary gridc. control gridd. suppressor grid
91. Remote cutoff is a term associated with:a. diodesb. triodesc. tetrodesd. pentodes
92. In a sharp cutoff tube, the grid wires are:a. unevenly spacedb. evenly spacedc. heavier than in other tubesd. made from electron emitting material
93. The screen gria of a vacuum tube is operated at:a. R negative potential with respect to cathodeb. a positive potential with respect to cathodec. a positive potential with respect to the plated. a negative potential with respect to the suppressor
grid
9L.. How does the action of the control grid in a thyratrondiffer from that of a high vacuum triode:a. when the discharge starts, the thyratron grid loses
controlb. the thyratron grid retains control throughout the cyclec. the thyratron grid gains control when the arc dis-
charge beginsd. the thyratron grid voltage is used to stop the arc
discharge
95. The klystron tube uses which principle of modulation forits operation:n. nmnlitudeb. velocityc. frequencyd. phase
96. Another name for a lighthouse tube is:a. an acorn tubeb. a planar tubec. pentode tubed. a VR tube
97. What is the purp se of the conductive coating within thecathode ray tube:a. return path for electrons striking the deflection
platesb. return path for secondary emitted electronsc. acts as a magnetic shieldd. provides a uniform area for light distribution
98. Which element i3 referred to as the first electronic lensof a cathode ray tube:A. control gridb. screen gridc. focusing anoded. accelerating anode
99. How does the control grid of a cathode ray tube differfrom the control grid of an amplifier tube:a. it is t.sed to control the amount of currentb. it is always negative with respect to the cathodec. it is solid with the exception of one small openingd. it cannot completely cut off the flow of electrons
100. An advantage of gas filled rectifiers over high vacuumdiode rectifiers is that they:a. convert A. C. to pulsating D. C.b. convert D. C. to A. C.c. also emit a glowd. are capable of handling large currents
1. B
2. C
3. D
4. D
5. B
6. C
7. D
8. D
9. B
10. B
11. A
12. B
1 ?. A
114.. B
15. A
16. 13
17. C
18. A
19. B
20. B
21. B
22. C
23. A
24.. 3
25. C
4.1; sWEit le. EY BEST COPY AVAILABLEfor
POST Ti: Win'ilESON4r!T CI?CUITS Vve,D INTRODUr.iloN TO VACLTITT.'
9325.0;16. c
27. D
28. C
29. B
A
31. C
32. A
33. C
C
B
36. C
37. B
B
39. A
14.0. A
14.1. A
/4.2. D
143. B
4414-5. D
B
14.7. C
14.8. A
14.9. C
50. B
51. B
52. A
53. B
54, 13
55. c
56. B
57. C
58. C
59. B
60. C
61. B
62. B
63. D
614.. A
65. B
66. C
67. D
68. C
69. B
70. D
71. A
72. C
73. C
714.. D
75. A
(6. ta
77. B
73. B
79. C
80. C
81.
82.
c
614..
d6. C
87. i3
88. A
89. C
90. 1)
9.1. 1.)
92. _-
93. 3
95.
96.
97.
9e.
99. C
100. D