- · pdf filean operational amplifier ic 741 consist of a) 20resistor 11transistor...

K.S ACADEMY, SALEM-QUESTION PAPER
K.S ACADEMY, SALEM PG TRB, POLYTECHNIC TRB & TNSET COACHING CENTRE FOR PHYSICS CELL:9042976707 Page 1
PG TRB , POLYTECHNIC TRB & TNSET COACHING CENTRE FOR PHYSICS
Slip test:OP-AMP
Time:1/2 Hour Marks: 25
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Answer all the question:
1. The function of amplitude limiter circuit is that it
a) Clips off all signals above positive reference voltage
b) clips off all signals below positive reference voltage
c) clips off all signals above negative reference voltage
d) clips off all signals below positive reference voltage
2. The following property denotes the ability of an op-Amp to handle varing
signal
a) CMRR b) Open loop gain c)Slew rate d) Zero drift
3. The operational amplifier is a
a) RC coupled amplifier b) Transformer coupled amplifier
c) Direct coupled amplifier d) Either a or b
4. Drift of op-amp is defined as
a)Change is offset current and voltage due to external noise
b) change in offset current and voltage due to temperature
c) change in offset current and voltage due to power supply
d) all the above
5. In op-Amp overall response characteristic controlled by
a) Input
b) Output
c) Feed back
d) Supply voltage
6. An operational amplifier IC 741 consist of
a) 20resistor 11transistor 1capacitor
a) 22registor 11transitor 1capacitor
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b) 20transitor 11resistor 1capacitor
c) 20capacitor 11resistor 1transistor
7. The feedback component of integrator is
a) Inductor
b) Resistor
c) No feed back component
d) Capacitor
8. An oscillator of the LC type that has a split capacitor in the circuit is
a) Hartley oscillator
b) Colpitts oscillator
c) Weinbridge oscillator
d) R-C phase shift oscillator
9. The output voltage of a integrator is
a) 0 = 1
+ 0 +
0
b) 0 = 1
+ 0
0
c) 0 =
d) 0 =
10. Wien bridge oscillator is
a) AF oscillator
b) Quadrature oscillator
c) Phase shift oscillator
d) Square wave generator
11. Schmitt trigger converts irregular waveforms to
a) Saw tooth
b) Triangular
c) Square
d) Sine
12.Multivibrators belong to the category of
a) Square wave oscillators b) Triangular wave oscillators
c) Ramp wave oscillators d) Sinusoidal oscillators
13. The important feature of instrumentation amplifier
a) High CmRR b) high gain accuracy
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c) high gain stability d)all of the above
14. The feedback of a multivibrator is
a)-ve b) +ve
c) both +ve & -ve d) none of these
15. The use of crystal in a tunable oscillator
a) Improves frequency stability.
b) Increases the gain of the oscillator.
c) Helps to obtain optimum output impedance.
d) Facilitates generation of wide range of frequencies.
16. A ve clipper removes the ---------- half cycles of the i/p voltage
a) rms value of input voltage b) +ve
c) both +ve & -ve d) ve
17. If the input to a differentiating circuit is a saw-tooth wave, then output will
be
a) square b) rectangular
c) triangular d) sine
18. Ina phase shift oscillator the frequency determining elements are
a) L and C b) R, C & C
c) R and C d) super capacitor
19. An ideal OP-AMP is an ideal
a) Current controlled Current source
b) Current controlled Voltage source
c) Voltage controlled Voltage source
d) Voltage controlled Current source
20. If the input signal is V=sin in an operational differentiator, the output
a) Cos b) Cos c) RC cos d) cos
PROBLEM FOR POLYTECHNIC & PG TRB
21. A monostable multivibrator has R = 120k and the time delay T = 1000ms,
calculate the value of C?
a) 9 b) 9.5 c) 6.5 d) 7.5
22 The most commonly used amplifier in sample and hold circuit is
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a) a unity gain inverting amplifier b) a unity gain non inverting amplifier
c.)an inverting amplifier with a gain of 10 d) an inverting amplifier with a gain of 100
23. Find the maximum frequency for a sine output voltageof 10 V peak with
op-amp whose slew rate is 1 V/
a)12 kHz b) 15 kHz c) 14 kHz d) 16 kHz
24. The maximum frequency at which we can obtain an undistorted
output voltage with peak value of is determined by slew rate in accordance
with
a) = /6.28 b) =
c) = 6.28 d) = /6.28
25. The circuit in Fig.1 represents
a) comparator b) zero-crossing detector
c) window detector d) waveform generator-square waveform
ANSWER IS ON THE LAST PAGE:
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&
K .S ! ( &
)
TRB
TRB .
UNIT SLIP TEST , UNIT TEST .
UNIT 400 . 1/3 rd PORTION TEST , HALF PORTION TEST .
(TEN FULL TEST) . 4000
. 2001 PG TRB
. 2006 , DIET
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(Polytechnic , DIET & Engineering TRB ) .
TNPSC (BT SCHOOL ASST ) PG TRB SYLLABUS .
TNSET , DIET LECTURER TRB & ENGINEERING ASSISTANT PROFESSOR TRB,
SCIENTIFIC ASSISTANT (TNPSC ), DEO (TNPSC MAINS PAPER -3) , TNPSC
SCHOOL ASSISTANT . EDUCATION , PSYCHOLOGY & GK
PG - TRB 51 PG TRB 11.05.2017
Your time is limited, so dont waste it.
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11.5.2017
K.S ACADEMY
(STC )
-1
. .........
Answer key
Q.NO ANS Q.NO ANS Q.NO ANS Q.NO ANS Q.NO ANS 1 A 11 C 21 D 2 C 12 A 22 B 3 C 13 D 23 D 4 B 14 A 24 A 5 C 15 A 25 B 6 A 16 D 7 D 17 B 8 B 18 C 9 B 19 C 10 A 20 C
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- · pdf filean operational amplifier ic 741 consist of a) 20resistor 11transistor...

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