McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Uncategorized topics .
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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