MCQOPTIONS
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MCQOPTIONS
This section includes 52 Mcqs, each offering curated multiple-choice questions to sharpen your Vlsi knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
In the below circuit if the current source is ideal, the voltage gain is: |
| A. | Av = -gm.Rs |
| B. | Av = -Io.Rs |
| C. | Av = -gm.Ron |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 2. |
The advantage of using source degeneration resistor in Common source amplifier is to provide: |
| A. | Huge gain |
| B. | Non Linearity behaviour of amplifier |
| C. | Linearity behaviour of amplifier |
| D. | Less gain |
| Answer» D. Less gain | |
| 3. |
In the below circuit of Common Source amplifier, the transistor M2 operates as: |
| A. | Load impedance |
| B. | Voltage source |
| C. | Current Source |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 4. |
In the below circuit, if the levels of input and output vary, the gain is found to: |
| A. | Increase linearly as input level increases |
| B. | Decrease linearly as output level decreases |
| C. | Remain constant |
| D. | Vary non linearly |
| Answer» D. Vary non linearly | |
| 5. |
The diode connected MOSFET acts as: |
| A. | Active element for amplification |
| B. | Voltage source |
| C. | Current Source |
| D. | Load Impedance |
| Answer» E. | |
| 6. |
In the below input output characteristic of MOSFET amplifier, if Vin > Vin1, the MOSFET is said to operate in: |
| A. | Saturation region |
| B. | Cutoff region |
| C. | Triode region |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 7. |
Input impedance of MOSFET amplifier in Common Source configuration is: |
| A. | Very high at high frequencies |
| B. | Very high at low frequencies |
| C. | Very low at high frequencies |
| D. | Very low at low frequencies |
| Answer» C. Very low at high frequencies | |
| 8. |
The input output characteristic of an amplifier is |
| A. | Linear function |
| B. | Non Linear function |
| C. | Sinusoidal function with change of phase |
| D. | None of the mentioned |
| Answer» C. Sinusoidal function with change of phase | |
| 9. |
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 | |
| 10. |
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. | |
| 11. |
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 | |
| 12. |
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 | |
| 13. |
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 | |
| 14. |
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 | |
| 15. |
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 | |
| 16. |
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 | |
| 17. |
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 | |
| 18. |
In a CE amplifier, the phase difference between voltage across collector load RC and signal voltage is ___________ |
| A. | 180° |
| B. | 270° |
| C. | 90° |
| D. | 0° |
| Answer» E. | |
| 19. |
The ratio of output impedance of a CE amplifier is ___________ |
| A. | About 1 |
| B. | Low |
| C. | High |
| D. | Moderate |
| Answer» E. | |
| 20. |
The phase difference between the output and input voltages of a CE amplifier is ___________ |
| A. | 180° |
| B. | 0° |
| C. | 90° |
| D. | 270° |
| Answer» B. 0° | |
| 21. |
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 | |
| 22. |
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 | |
| 23. |
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 | |
| 24. |
A single stage transistor amplifier with no load sees an a.c. load of |
| A. | RC + RE |
| B. | RC |
| C. | RC || RE |
| D. | RC/RE |
| Answer» C. RC || RE | |
| 25. |
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 | |
| 26. |
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 | |
| 27. |
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. | |
| 28. |
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 | |
| 29. |
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 | |
| 30. |
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 | |
| 31. |
In a CE amplifier, voltage gain = ___________ x RAC/Rin |
| A. | α |
| B. | (1 + α) |
| C. | (1+ β) |
| D. | β |
| Answer» E. | |
| 32. |
The input capacitor in an amplifier is the ___________ capacitor |
| A. | Coupling |
| B. | Bypass |
| C. | Leakage |
| D. | None of the above |
| Answer» B. Bypass | |
| 33. |
In transistor amplifiers, we generally use ___________ capacitors. |
| A. | Electrolytic |
| B. | Mica |
| C. | Paper |
| D. | Air |
| Answer» B. Mica | |
| 34. |
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 | |
| 35. |
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 | |
| 36. |
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 | |
| 37. |
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. | |
| 38. |
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 | |
| 39. |
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. | |
| 40. |
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. | |
| 41. |
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 | |
| 42. |
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 | |
| 43. |
A CE amplifier is also called ___________ circuit |
| A. | Grounded emitter |
| B. | Grounded base |
| C. | Grounded collector |
| D. | None of the above |
| Answer» B. Grounded base | |
| 44. |
The advantage of using source degeneration resistor in Common source amplifier is to provide:$ |
| A. | Huge gain |
| B. | Non Linearity behaviour of amplifier |
| C. | Linearity behaviour of amplifier |
| D. | Less gain |
| Answer» D. Less gain | |
| 45. |
The diode connected MOSFET acts as? |
| A. | Active element for amplification |
| B. | Voltage source |
| C. | Current Source |
| D. | Load Impedance |
| Answer» E. | |
| 46. |
The MOSFET is said to be in diode connected configuration if: |
| A. | A diode is placed between supply and drain |
| B. | A diode is placed between source and ground |
| C. | Source and gate are connected |
| D. | Drain and gate are connected |
| Answer» E. | |
| 47. |
The voltage gain of the MOSFET is given by: |
| A. | Av = -βRd |
| B. | Av = γRd |
| C. | Av = -gmRd |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 48. |
Input impedance of MOSFET amplifier in Common Source configuration is : |
| A. | Very high at high frequencies |
| B. | Very high at low frequencies |
| C. | Very low at high frequencies |
| D. | Very low at low frequencies |
| Answer» C. Very low at high frequencies | |
| 49. |
In MOSFET amplifier, the parameter that changes due to the changes in input is: |
| A. | Small signal drain current |
| B. | Large signal drain current |
| C. | Voltage across substrate and source |
| D. | None of the mentioned |
| Answer» B. Large signal drain current | |
| 50. |
In MOSFET amplifier, the input is applied as: |
| A. | Voltage across gate and source |
| B. | Voltage across drain and source |
| C. | Current at gate |
| D. | Current at Drain |
| Answer» B. Voltage across drain and source | |