MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 37 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering Questions knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
When an a.c. signal is applied to an amplifier, ,the operating point moves along_________________? |
| A. | a.c. load line |
| B. | d.c. load line |
| C. | both d.c. and a.c. load lines |
| D. | none of the above |
| Answer» B. d.c. load line | |
| 2. |
When a transistor amplifier is operating, the current in any branch is _______________? |
| A. | Sum of a.c. and d.c. |
| B. | a.c. only |
| C. | d.c. only |
| D. | difference of a.c. and d.c. |
| Answer» B. a.c. only | |
| 3. |
The value of collector load RC in a transistor amplifier is _______________the output impedance of the transistor? |
| A. | The same as |
| B. | Less than |
| C. | More than |
| D. | None of the above |
| Answer» C. More than | |
| 4. |
The slope of a.c. load line is ______________ that of d.c. load line? |
| A. | The same as |
| B. | More than |
| C. | Less than |
| D. | None of the above |
| Answer» C. Less than | |
| 5. |
The ratio of output impedance of a CE amplifier is _______________? |
| A. | About 1 |
| B. | Low |
| C. | High |
| D. | Moderate |
| Answer» E. | |
| 6. |
The radio wave picked up by the receiving antenna is amplified about _________________ times to have reasonable sound output? |
| A. | 1000 |
| B. | A million |
| C. | 100 |
| D. | 10000 |
| Answer» C. 100 | |
| 7. |
The purpose of emitter capacitor (i.e. capacitor across RE) is to ______________? |
| A. | Avoid voltage gain drop |
| B. | Forward bias the emitter |
| C. | Reduce noise in the amplifier |
| D. | None of the above |
| Answer» B. Forward bias the emitter | |
| 8. |
The purpose of d.c. conditions in a transistor is to___________________? |
| A. | Reverse bias the emitter |
| B. | Forward bias the collector |
| C. | Set up operating point |
| D. | None of the above |
| Answer» D. None of the above | |
| 9. |
The purpose of capacitors in a transistor amplifier is to___________________? |
| A. | Protect the transistor |
| B. | Cool the transistor |
| C. | Couple or bypass a.c. component |
| D. | Provide biasing |
| Answer» D. Provide biasing | |
| 10. |
The purpose of a coupling capacitor in a transistor amplifier is to ___________________? |
| A. | Increase the output impedance of transistor |
| B. | Protect the transistor |
| C. | Pass a.c. and block d.c. |
| D. | Provide biasing |
| Answer» D. Provide biasing | |
| 11. |
The point of intersection of d.c. and a.c. load lines is called________________? |
| A. | Saturation point |
| B. | Cut off point |
| C. | Operating point |
| D. | None of the above |
| Answer» D. None of the above | |
| 12. |
The phase difference between the output and input voltages of a CE amplifier is _____________? |
| A. | 180o |
| B. | 0o |
| C. | 90o |
| D. | 270o |
| Answer» B. 0o | |
| 13. |
The output power of a transistor amplifier is more than the input power because the additional power is supplied by__________________? |
| A. | Transistor |
| B. | Biasing circuit |
| C. | Collector supply VCC |
| D. | None of the above |
| Answer» D. None of the above | |
| 14. |
The input capacitor in an amplifier is the______________ capacitor? |
| A. | Coupling |
| B. | Bypass |
| C. | Leakage |
| D. | None of the above |
| Answer» B. Bypass | |
| 15. |
The d.c. load of a transistor amplifier is generally_______________ that of a a.c. load? |
| A. | The same as |
| B. | Less than |
| C. | More than |
| D. | None of the above |
| Answer» D. None of the above | |
| 16. |
It is generally desired that a transistor should have_____________________ input impedance? |
| A. | Low |
| B. | Very low |
| C. | High |
| D. | Very high |
| Answer» D. Very high | |
| 17. |
In transistor amplifiers, we generally use______________ capacitors? |
| A. | Electrolytic |
| B. | Mica |
| C. | Paper |
| D. | Air |
| Answer» B. Mica | |
| 18. |
In the zero signal conditions, a transistor sees _____________ load? |
| A. | a.s. |
| B. | d.c. |
| C. | both d.c. and a.c. |
| D. | none of the above |
| Answer» C. both d.c. and a.c. | |
| 19. |
In the d.c. equivalent circuit of a transistor amplifier, the capacitors are considered__________________? |
| A. | Short |
| B. | Open |
| C. | Partially short |
| D. | None of the above |
| Answer» C. Partially short | |
| 20. |
In the a.c. equivalent circuit of a transistor amplifier, the capacitors are considered ___________________? |
| A. | Short |
| B. | Open |
| C. | Partially open |
| D. | None of the above |
| Answer» B. Open | |
| 21. |
In order to get more voltage gain from a transistor amplifier, the transistor used should have_________________? |
| A. | Thin base |
| B. | Thin collector |
| C. | Wide emitter |
| D. | None of the above |
| Answer» B. Thin collector | |
| 22. |
In a single stage transistor amplifier, RC and RL represent collector resistance and load resistance respectively. The transistor sees a d.c. load of _____________________? |
| A. | RC + RL |
| B. | RC || RL |
| C. | RL |
| D. | RC |
| Answer» E. | |
| 23. |
In a CE amplifier, voltage gain =____________________ x RAC/Rin? |
| A. | α |
| B. | (1 + α) |
| C. | (1+ β) |
| D. | β |
| Answer» E. | |
| 24. |
In a CE amplifier, the phase difference between voltage across collector load RC and signal voltage is _________________? |
| A. | 180o |
| B. | 270o |
| C. | 90o |
| D. | 0o |
| Answer» E. | |
| 25. |
If the power and current gains of a transistor amplifier are 16500 and 100 respectively, then voltage gain is_____________________? |
| A. | 165 |
| B. | 165 x 104 |
| C. | 100 |
| D. | None of the above |
| Answer» B. 165 x 104 | |
| 26. |
If the input capacitor of a transistor amplifier is short-circuited, then_________________? |
| A. | Transistor will be destroyed |
| B. | Biasing conditions will change |
| C. | Signal will not reach the base |
| D. | None of the above |
| Answer» C. Signal will not reach the base | |
| 27. |
If the collector supply is 10V, then collector cut off voltage under d.c. conditions is _______________? |
| A. | 20 V |
| B. | 5 V |
| C. | 2 V |
| D. | 10 V |
| Answer» E. | |
| 28. |
If RC and RL represent the collector resistance and load resistance respectively in a single stage transistor amplifier, then a.c. load is____________________? |
| A. | RL + RC |
| B. | RC || RL |
| C. | RL – RC |
| D. | RC |
| Answer» C. RL – RC | |
| 29. |
If a transistor amplifier feeds a load of low resistance (e.g. speaker), then voltage gain will be_______________? |
| A. | High |
| B. | Very high |
| C. | Moderate |
| D. | Low |
| Answer» E. | |
| 30. |
If a transistor amplifier draws 2mA when input voltage is 10 V, then its input impedance is ____________? |
| A. | 20 kΩ |
| B. | 2 kΩ |
| C. | 10 kΩ |
| D. | 5 kΩ |
| Answer» E. | |
| 31. |
For highest power gain, one would use _________________configuration? |
| A. | CC |
| B. | CB |
| C. | CE |
| D. | none of the above |
| Answer» D. none of the above | |
| 32. |
CC configuration is used for impedance matching because its ________________? |
| A. | Input impedance is very high |
| B. | Input impedance is low |
| C. | Output impedance is very low |
| D. | None of the above |
| Answer» B. Input impedance is low | |
| 33. |
An amplifier has a power gain of 100. Its db gain is ________________? |
| A. | 10 db |
| B. | 20 db |
| C. | 40 db |
| D. | None of the above |
| Answer» C. 40 db | |
| 34. |
A transistor converts __________________? |
| A. | d.c. power into a.c. power |
| B. | a.c. power into d.c. power |
| C. | high resistance into low resistance |
| D. | none of the above |
| Answer» B. a.c. power into d.c. power | |
| 35. |
A transistor amplifier has high output impedance because ______________? |
| A. | Emitter is heavily doped |
| B. | Collector has reverse bias |
| C. | Collector is wider than emitter or base |
| D. | None of the above |
| Answer» C. Collector is wider than emitter or base | |
| 36. |
A single stage transistor amplifier with collector load RC and emitter resistance RE has a d.c. load of ________________________? |
| A. | RC |
| B. | RC || RE |
| C. | RC – RE |
| D. | RC + RE |
| Answer» E. | |
| 37. |
A single stage transistor amplifier contains______________ and associated circuitry? |
| A. | Two transistors |
| B. | One transistor |
| C. | Three transistor |
| D. | None of the above |
| Answer» C. Three transistor | |