MCQOPTIONS
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MCQOPTIONS
This section includes 657 Mcqs, each offering curated multiple-choice questions to sharpen your Testing Subject knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
An emitter-follower has ________ impedance at the input and ________ impedance at the output. |
| A. | high, high |
| B. | low, high |
| C. | high, low |
| D. | low, low |
| Answer» D. low, low | |
| 2. |
Ideally, the changes in the load resistor or the source resistor should have ________ effect on all the parameters of the two-port model. |
| A. | a great |
| B. | a moderate |
| C. | no |
| D. | None of the above |
| Answer» D. None of the above | |
| 3. |
The ac voltage gain of a Darlington connection is about ________. |
| A. | 0 |
| B. | 1 |
| C. | <img src="/_files/images/electronic-devices-and-circuit-theory/beta.gif"> |
| D. | <sub>D</sub> |
| E. | None of the above |
| Answer» C. <img src="/_files/images/electronic-devices-and-circuit-theory/beta.gif"> | |
| 4. |
One junction of an operating transistor is ________ and the other one is ________. |
| A. | forward-biased, forward-biased |
| B. | forward-biased, reverse-biased |
| C. | reverse-biased, reverse-biased |
| D. | None of the above |
| Answer» C. reverse-biased, reverse-biased | |
| 5. |
The ________ the level of RL, the ________ the level of ac voltage gain. |
| A. | smaller, higher |
| B. | larger, lower |
| C. | smaller, lower |
| D. | None of the above |
| Answer» D. None of the above | |
| 6. |
The coupling capacitor places the load and collector resistors in a ________ arrangement. |
| A. | series |
| B. | parallel |
| C. | series-parallel |
| D. | None of the above |
| Answer» C. series-parallel | |
| 7. |
A common-base configuration has ________ impedance at the input and ________ impedance at the output. |
| A. | high, high |
| B. | high, low |
| C. | low, low |
| D. | low, high |
| Answer» E. | |
| 8. |
The ________ the source resistance, the ________ the overall gain of an amplifier. |
| A. | larger, higher |
| B. | larger, lower |
| C. | lower, lower |
| D. | None of the above |
| Answer» C. lower, lower | |
| 9. |
In a common-base configuration, the input and output voltages are ________ and the output and input currents are ________. |
| A. | 180 out of phase, 180 out of phase |
| B. | 180 out of phase, in phase |
| C. | in phase,180 out of phase |
| D. | in phase, in phase |
| Answer» E. | |
| 10. |
The ________ of the input signal is one of the first concerns in the sinusoidal ac analysis of transistor networks. |
| A. | period |
| B. | frequency |
| C. | magnitude |
| D. | None of the above |
| Answer» D. None of the above | |
| 11. |
The input and output signals are ________ for the typical transistor amplifier at frequencies that permit ignoring the effects of the reactive elements. |
| A. | in phase |
| B. | 180 out of phase |
| C. | either in phase or 180 out of phase |
| D. | None of the above |
| Answer» D. None of the above | |
| 12. |
The output voltage and the input voltage are ________ for the common-emitter configuration. |
| A. | in phase |
| B. | 45 out of phase |
| C. | 90 out of phase |
| D. | 180 out of phase |
| Answer» E. | |
| 13. |
For R2 smaller than ________ k the voltage VD is equal to VDD = 16 V. |
| A. | 3.75 |
| B. | 5 |
| C. | 12.0 |
| D. | 24 |
| Answer» B. 5 | |
| 14. |
In a depletion-type MOSFET, the transfer characteristic rises ________ as VGS becomes more positive. |
| A. | less rapidly |
| B. | more rapidly |
| C. | the same |
| D. | None of the above |
| Answer» C. the same | |
| 15. |
In a JFET, the level of ________ is limited to values between 0 V and VP. |
| A. | <img src="/_files/images/electronic-devices-and-circuit-theory/fba07_0200a.gif"> |
| B. | <img src="/_files/images/electronic-devices-and-circuit-theory/fba07_0200b.gif"> |
| C. | <img src="/_files/images/electronic-devices-and-circuit-theory/fba07_0200c.gif"> |
| D. | <img src="/_files/images/electronic-devices-and-circuit-theory/fba07_0200d.gif"> |
| Answer» E. | |
| 16. |
The bypass capacitor in a common-emitter configuration ________ the voltage gain. |
| A. | significantly decreases |
| B. | significantly increases |
| C. | slightly increases |
| D. | slightly decreases |
| Answer» C. slightly increases | |
| 17. |
The loaded voltage gain of an amplifier is ________ the no-load level. |
| A. | always more than |
| B. | always less than |
| C. | always the same as |
| D. | None of the above |
| Answer» C. always the same as | |
| 18. |
The common-emitter configuration has a ________ level of input impedance with a ________ voltage and current gain. |
| A. | moderate, high |
| B. | low, moderate |
| C. | low, low |
| D. | high, low |
| Answer» B. low, moderate | |
| 19. |
A ________ power amplifier is limited to use at one fixed frequency. |
| A. | class A |
| B. | class B or AB |
| C. | class C |
| D. | class D |
| Answer» D. class D | |
| 20. |
A class A amplifier dissipates ________ power when the load is drawing maximum power from the circuit. |
| A. | the least |
| B. | about the same |
| C. | the most |
| D. | None of the above |
| Answer» B. about the same | |
| 21. |
The main feature(s) of a large-signal amplifier is (are) the ________. |
| A. | circuit's power efficiency |
| B. | maximum amount of power that the circuit is capable of handling |
| C. | impedance matching to the output |
| D. | All of the above |
| Answer» E. | |
| 22. |
The ________ has the hottest temperature in a power transistor. |
| A. | heat sink |
| B. | case |
| C. | junction |
| D. | None of the above |
| Answer» D. None of the above | |
| 23. |
A class A amplifier conducts 180 of the cycle. |
| A. | True |
| B. | False |
| Answer» C. | |
| 24. |
AC current ratios ac and ac convert directly from h parameters. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 25. |
Besides the fact that DC = IC/IB and ac = IC/IB, these quantities are always the same for purposes of small-signal amplification. |
| A. | True |
| B. | False |
| Answer» C. | |
| 26. |
In a fixed-bias network, the input signal Vi is applied to the ________ of the transistor while the output Vo is off the ________. |
| A. | base, collector |
| B. | base, emitter |
| C. | emitter, collector |
| D. | None of the above |
| Answer» B. base, emitter | |
| 27. |
r'e is temperature dependent. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 28. |
A common-collector amplifier has high input impedance, good current gain, and a voltage gain of 1. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 29. |
The total voltage gain of a multistage amplifier is the product of the individual stage gains. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 30. |
In a class A transformer-coupled power amplifier, ________ winding resistance of the transformer determine(s) the dc load line for the circuit. |
| A. | the ac |
| B. | the dc |
| C. | both the ac and dc |
| D. | neither the ac nor dc |
| Answer» C. both the ac and dc | |
| 31. |
A form of class A amplifier having maximum efficiency of ________ uses a transformer to couple the output signal to the load. |
| A. | 90% |
| B. | 78.5% |
| C. | 50% |
| D. | 25% |
| Answer» D. 25% | |
| 32. |
The feedback pair uses a(n) ________ transistor driving a(n) ________ transistor, the two devices acting effectively much like one pnp transistor. |
| A. | <i>pnp, npn</i> |
| B. | <i>pnp, pnp</i> |
| C. | <i>npn, npn</i> |
| D. | None of the above |
| Answer» B. <i>pnp, pnp</i> | |
| 33. |
The ratio of current ID to IDSS is equal to ________ for a fixed-bias configuration. |
| A. | 0 |
| B. | 0.25 |
| C. | 0.5 |
| D. | 1 |
| Answer» E. | |
| 34. |
Class A amplifiers operate in the active region of the load line all of the time. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 35. |
The efficiency of any amplifier is the ratio of signal output power to signal input power. |
| A. | True |
| B. | False |
| Answer» C. | |
| 36. |
In class B power amplifiers, the output signal varies for ________ of the cycle. |
| A. | 360 |
| B. | 180 |
| C. | between 180 and 360 |
| D. | less than 180 |
| Answer» C. between 180 and 360 | |
| 37. |
________ amplifiers have the highest overall efficiency. |
| A. | Class A |
| B. | Class B or AB |
| C. | Class C |
| D. | Class D |
| Answer» E. | |
| 38. |
Power amplifiers primarily provide sufficient power to an output load, typically from ________ to ________. |
| A. | a few kW, tens of kW |
| B. | 500 W, 1 kW |
| C. | 100 W, 500 W |
| D. | a few W, tens of W |
| Answer» E. | |
| 39. |
The ________ region is the region normally employed for linear (undistorted) amplifiers. |
| A. | active |
| B. | cutoff |
| C. | saturation |
| D. | All of the above |
| Answer» B. cutoff | |
| 40. |
In the cutoff region the collector-base junction is ________-biased and the base-emitter junction is ________-biased for a transistor. |
| A. | reverse, forward |
| B. | forward, reverse |
| C. | reverse, reverse |
| D. | forward, forward |
| Answer» D. forward, forward | |
| 41. |
The input to an op-amp can be a(n) ________. |
| A. | dc source |
| B. | ac source |
| C. | combination of ac and dc sources |
| D. | All of the above |
| Answer» E. | |
| 42. |
The level of the output voltage of an op-amp circuit is always ________ the level of VCC. |
| A. | larger than |
| B. | the same as |
| C. | smaller than |
| D. | None of the above |
| Answer» D. None of the above | |
| 43. |
A filter that passes signals that are above one ideal cutoff frequency and below a second cutoff frequency is called ________. |
| A. | low-pass |
| B. | high-pass |
| C. | bandpass |
| D. | band reject |
| Answer» D. band reject | |
| 44. |
________ build a multistage connection. |
| A. | Only an inverting op-amp circuit must be used to |
| B. | Only a noninverting op-amp circuit must be used to |
| C. | Both inverting and noninverting op-amp circuits can be used to |
| D. | Neither inverting nor noninverting op-amp circuits must be used to |
| Answer» D. Neither inverting nor noninverting op-amp circuits must be used to | |
| 45. |
A low-pass filter ________. |
| A. | provides a constant output up to the cutoff frequency |
| B. | passes frequencies from zero up to the cutoff frequency |
| C. | rejects all frequencies above the cutoff frequency |
| D. | All of the above |
| Answer» E. | |
| 46. |
A bandpass filter uses ________ circuit. |
| A. | a high-pass |
| B. | a low-pass |
| C. | a high-pass and a low-pass |
| D. | neither a low-pass nor a high-pass |
| Answer» D. neither a low-pass nor a high-pass | |
| 47. |
A voltage summing amplifier has ________. |
| A. | several inputs and several outputs |
| B. | several inputs and one output |
| C. | one input and several outputs |
| D. | one input and one output |
| Answer» C. one input and several outputs | |
| 48. |
The roll-off for a second-order high-pass filter is ________. |
| A. | either 20 dB per decade or 6 dB per octave |
| B. | either 40 dB per decade or 12 dB per octave |
| C. | either 60 dB per decade or 18 dB per octave |
| D. | None of the above |
| Answer» C. either 60 dB per decade or 18 dB per octave | |
| 49. |
In a dc millivoltmeter, the amplifier provides a meter with ________ input impedance and a scale factor dependent on ________ value and accuracy. |
| A. | high, resistor |
| B. | low, resistor |
| C. | high, capacitor |
| D. | None of the above |
| Answer» B. low, resistor | |
| 50. |
A(n) ________ is not a component of a passive filter. |
| A. | op-amp |
| B. | capacitor |
| C. | inductor |
| D. | resistor |
| Answer» B. capacitor | |