ee_phys_012_final_exam

8/12/2019 EE_Phys_012_Final_Exam

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KING FAHD UNIVERSITY OF PETROLEUM AND MINERALSUniversity Diplo ! Pro"r! sPHYS #$%& Soli' St!te P(ysi)s

Fin!l E*! in!tionS!t+r'!y, -!n+!ry $., %##/

St+'ent N! e& ID 0&

1+estion No2 Points S)ore$2 $#%2 $#/2 $#

32 $#42 $#52 $#62 $#.2 472 4

$#2 4$$2 $4

Tot!l $##


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Q.1 Write the device name, or its abbreviation, under each of the followingsymbols. Label each symbol with its appropriate terminal designations.

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Q.2 Write the device name, the fully qualified name, under each of the followingsymbols. Label each symbol with its appropriate terminal designations.

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Q.3 ircle the most accurate answer for each of the following questions!

". # thyristor has!

$a% two pn &unction,$b% three pn &unctions,$c% four pn &unctions,$d% only two terminals.

"". 'nce it is conducting, a ()layer diode can be turned off by!

$a% reducing the current below a certain value,$b% disconnecting the anode voltage,

$c% answers $a% and $b%,$d% neither answer $a% nor $b%.

""". #n * + can be turned off by!

$a% forced commutation,$b% a negative pulse on the gate,$c% anode current interruption,$d% answers $a%, $b%, and $c%,$e% answers $a% and $c%.

" . -he specified value of holding current for an * + means that!

$a% the device will turn on when the anode current e ceeds this value,$b% the device will turn off when the anode current falls below this value,$c% the device may be damaged if the anode current e ceeds this value,$d% the gate current must equal or e ceed this value to turn the device on.

. -he diac is!

$a% a thyristor,$b% a bilateral, two)terminal device,$c% li/e two parallel ()layer diodes in reverse directions,$d% answers $a%, $b%, and $c%.

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Q.( ircle the most accurate answer for each of the following questions!

". -he triac is!

$a% li/e a bidirectional * +,$b% a four)terminal device,$c% not a thyristor,$d% answers $a% and $b%.

"". -he * * differs from the * + because!

$a% it does not have a gate terminal,$b% its holding current is less,

$c% it can handle much higher currents,$d% it has two gate terminals.

""". -he * * can be turned on by!

$a% an anode voltage that e ceeds forward)brea/over voltage,$b% a positive pulse on the cathode gate,$c% a negative pulse on the anode gate,$d% either $b% or $c%.

" . -he * * can be turned off by!

$a% a negative pulse on the cathode gate and a positive pulse on theanode gate,

$b% reducing the anode current to below the holding value,$c% answers $a% and $b%,$d% a positive pulse on the cathode gate and a negative pulse on the

anode gate.

. Which of the following is not a characteristic of the 0 - !

$a% intrinsic standoff ratio,$b% negative resistance,$c% pea/)point voltage,$d% bilateral conduction.

(Page 5 of 13)


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Q. ircle the most accurate answer for each of the following questions!

". #n amplifier that operates in the linear region at all times is!

$a% lass #,$b% lass #4,$c% lass 4,$d% lass .

"". # certain class # power amplifier delivers W to a load with an inputsignal power of 155 mW. -he power gain is!

$a% 155,

$b% 5,$c% 2 5,$d% .

""". -he pea/ current a class # power amplifier can deliver to a loaddepends on the!

$a% ma imum rating of the power supply,$b% quiescent current,$c% current in the bias resistors,$d% si6e of the heat sin/.

" . -he transistors in a class 4 amplifier are biased!

$a% into cutoff,$b% in saturation,$c% at midpoint of the load line,

$d% right at cutoff.

. -he 70- is!

$a% much li/e the 0 -,$b% not a thyristor,$c% triggered on and off by the gate)to)anode voltage,$d% not a four)layer device.

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Q.8 #nswer the following questions!

a. # 9:- has a specified pinch)off voltage of ( . When V ;* < 5, what isV =* at the point where the drain current becomes constant

b. # certain 9:- data sheet gives V ;$off% < )> and I =**


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Q.> #nswer the following questions!

a. What is the role of the * + in the following circuit

b. What is the role of the 0 - in the following circuit */etch the outputvoltage, V +2 .

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Q.? =etermine I 4 , I , and V : for a base)biased transistor circuit with thefollowing values! = < @5,V


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Q.@ # collector)feedbac/ circuit uses an npn transistor with V


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Q.15 #naly6e the circuit in the following figure to determine the correct voltagesat the transistor terminals with respect to ground. #ssume = < 255.

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$4lan/ page for Q.11%

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ee_phys_012_final_exam

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