McqMate
Chapters
1. |
LED starts to conduct when voltage is about |
A. | 1 V |
B. | 4 V |
C. | 3 V |
D. | 2 V |
Answer» D. 2 V |
2. |
For non-inverting amplifier the input and output is |
A. | out of phase |
B. | in phase |
C. | have phase difference of 180° |
D. | have phase difference of 90° |
Answer» B. in phase |
3. |
A sensing device is also called |
A. | transistor |
B. | thermistor |
C. | sensor |
D. | transducer |
Answer» D. transducer |
4. |
Op-amp can provide maximum output current of |
A. | 25 mA |
B. | 30 mA |
C. | 35 mA |
D. | 40 mA |
Answer» A. 25 mA |
5. |
Output resistance of an actual op-amp is |
A. | 45Ω |
B. | 46Ω |
C. | 70Ω |
D. | 75Ω |
Answer» D. 75Ω |
6. |
Impedance of ideal op-amp is |
A. | zero |
B. | 1 |
C. | infinite |
D. | 2 |
Answer» C. infinite |
7. |
Change in length and cross-sectional area of metal wire changes |
A. | current |
B. | voltage |
C. | resistance |
D. | magnetic effect |
Answer» C. resistance |
8. |
Amplifier produces output with more |
A. | power only |
B. | voltage only |
C. | current only |
D. | power and voltage |
Answer» D. power and voltage |
9. |
Number of power supplies required to get output of op-amp is |
A. | two |
B. | four |
C. | six |
D. | three |
Answer» A. two |
10. |
A device used to avoid the relay destroying the op-amp is |
A. | diode |
B. | LED |
C. | reverse bias diode |
D. | forward biased diode |
Answer» C. reverse bias diode |
11. |
As long as op-amp is not saturated, the potential difference between inverting and non-inverting inputs is |
A. | zero |
B. | infinite |
C. | 1 |
D. | 2 |
Answer» A. zero |
12. |
A light dependent resistor is made up of |
A. | low resistance semiconductor |
B. | low resistance metal |
C. | high resistance semiconductor |
D. | high resistance metal |
Answer» C. high resistance semiconductor |
13. |
In inverting amplifier, the phase difference between input and output voltages must be |
A. | 30° |
B. | 45° |
C. | 90° |
D. | 180° |
Answer» D. 180° |
14. |
An infinite slew rate refers to |
A. | no time delay |
B. | small time delay |
C. | large time delay |
D. | variable time delay |
Answer» A. no time delay |
15. |
To limit current in LED, resistor should be connected in |
A. | parallel |
B. | series |
C. | evacuated flask |
D. | ionized tube |
Answer» B. series |
16. |
A component whose property changes when there is a change in any physical quantity of a device is |
A. | processor |
B. | sensor |
C. | output device |
D. | portable device |
Answer» B. sensor |
17. |
Benefits of negative feedback include |
A. | less distortion |
B. | increased bandwidth |
C. | low output resistance |
D. | all of above |
Answer» D. all of above |
18. |
When temperature rises, resistance of negative temperature coefficient thermistor |
A. | increases |
B. | decreases |
C. | zero |
D. | infinity |
Answer» B. decreases |
19. |
If current of 20 mA is passing through op-amp and voltage drop across series resistor is 10 V then value of resistance is |
A. | 500Ω |
B. | 400Ω |
C. | 300Ω |
D. | 200Ω |
Answer» A. 500Ω |
20. |
Graph of resistance of thermistor to temperature is |
A. | exponential decrease |
B. | linear decrease |
C. | exponential increase |
D. | linear increase |
Answer» A. exponential decrease |
21. |
Output current from an LED is |
A. | 20 mA |
B. | 30 mA |
C. | 40 mA |
D. | 50 mA |
Answer» A. 20 mA |
22. |
In an inverting amplifier the non-inverting input (+) is connected to |
A. | 1 V line |
B. | 0 V line |
C. | 2 V line |
D. | 3 V line |
Answer» B. 0 V line |
23. |
Actual op-amp may have an open loop gain of{{}} |
A. | 102 |
B. | 105 |
C. | 103 |
D. | 104 |
Answer» B. 105 |
24. |
Coil of relay is connected to the |
A. | input of op-amp |
B. | output of op-amp |
C. | midpoint of op-amp |
D. | anywhere in between input and ouput of op-amp |
Answer» B. output of op-amp |
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