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. |
When a transistor is connected in common emitter mode, it with have |
| A. | negligible input resistance and high output resistance |
| B. | high input resistance and low output resistance |
| C. | medium input resistance and high output resistance |
| D. | low input resistance as well as output resistance |
| Answer» D. low input resistance as well as output resistance | |
| 2. |
In the equivalent circuit of figure voltage gain is |
| A. | <span class="symbol">a</span> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/analog-electronics/321-311-1.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/analog-electronics/321-311-2.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/analog-electronics/321-311-3.png"> |
| Answer» D. <img src="/_files/images/electronics-and-communication-engineering/analog-electronics/321-311-3.png"> | |
| 3. |
The V MOS can handle __________ currents than a conventional MOSFET. |
| A. | much lower |
| B. | almost same |
| C. | almost half |
| D. | much larger |
| Answer» E. | |
| 4. |
Assertion (A): A resistor is a passive load and a transistor is an active loadReason (R): Op-amp is mostly used in feedback mode |
| A. | Both A and R are correct and R is correct explanation for A |
| B. | Both A and R are correct but R is not correct explanation for A |
| C. | A is correct R is wrong |
| D. | A is wrong R is correct |
| Answer» C. A is correct R is wrong | |
| 5. |
Which mode is usually preferred for cascading? |
| A. | CE |
| B. | CB |
| C. | CC |
| D. | Any of the above |
| Answer» B. CB | |
| 6. |
In figure VCC = + 30 V, IC corresponding to Q point is 1 mA. If RC = 5 k&ohm; and RE = 5 k&ohm;, VCE corresponding to Q point is |
| A. | 30 V |
| B. | 20 V |
| C. | 25 V |
| D. | 5 V |
| Answer» C. 25 V | |
| 7. |
In which of the following circuits is op-amp used in open loop configuration? |
| A. | Comparator |
| B. | Summing amplifier |
| C. | Integrating amplifier |
| D. | Logarithmic amplifier |
| Answer» B. Summing amplifier | |
| 8. |
In a diode rectifier with a capacitance input filter, a surge current is likely to flow when the circuit is switched on. The cause of this surge current is |
| A. | the non linear behaviour of diodes |
| B. | the capacitor acts as a short circuit at the instant of switching, |
| C. | the inductance of leads |
| D. | both (a) and (b) |
| Answer» C. the inductance of leads | |
| 9. |
The parameter of a BJT change by 300%. If self bias is used in the amplifier using this BJT, the quiescent value of IC and VCE remain almost the same. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 10. |
Rise time in a transistor is change from |
| A. | 10% of its final value to 90% of its final value |
| B. | 0% of its final value to 90% of its final value |
| C. | 10% of its final value to 100% of its final value |
| D. | 10% to its final value to 50% of its final value |
| Answer» B. 0% of its final value to 90% of its final value | |
| 11. |
A bypass capacitor produces |
| A. | dc ground |
| B. | ac ground |
| C. | both dc and ac ground |
| D. | none of the above |
| Answer» C. both dc and ac ground | |
| 12. |
A junction Field Effect Transistor can operate in |
| A. | depletion mode only |
| B. | enhancement mode only |
| C. | depletion and enhancement modes |
| D. | neither depletion nor enhancement modes |
| Answer» B. enhancement mode only | |
| 13. |
In a base driver amplifier the voltage gain is the ratio of |
| A. | ac collector voltage to ac base voltage |
| B. | ac emitter voltage to ac base voltage |
| C. | ac collector voltage to ac emitter voltage |
| D. | ac base voltage to ac emitter voltage |
| Answer» B. ac emitter voltage to ac base voltage | |
| 14. |
The re model equivalent circuit shown in figure is for |
| A. | CE amplifier |
| B. | CC amplifier |
| C. | CB amplifier |
| D. | None of the above |
| Answer» D. None of the above | |
| 15. |
Assertion (A): A class C amplifier is a timed amplifier which needs a tank circuit as the load in the collector circuit of the transistor for its proper operationReason (R): In class C operation collector current flows for less than 180 of the ac cycle and thus flows in pulses |
| A. | Both A and R are correct and R is correct explanation for A |
| B. | Both A and R are correct but R is not correct explanation for A |
| C. | A is correct R is wrong |
| D. | A is wrong R is correct |
| Answer» B. Both A and R are correct but R is not correct explanation for A | |
| 16. |
In a CC circuit the current gain is |
| A. | <img src="/_files/images/electronics-and-communication-engineering/analog-electronics/322-320-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/analog-electronics/322-320-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/analog-electronics/322-320-3.png"> |
| D. | |
| Answer» B. <img src="/_files/images/electronics-and-communication-engineering/analog-electronics/322-320-2.png"> | |
| 17. |
For the circuit shown in figure low cut-off frequency is |
| A. | 1.59 Hz |
| B. | 159 Hz |
| C. | 1.59 kHz |
| D. | 1.59 MHz |
| Answer» B. 159 Hz | |
| 18. |
A feedback network to be used with an amplifier to provide oscillation is tested and found to give an output of 0.124 V with a 0.5 V input. What must be the minimum gain of the oscillator to provide oscillations? |
| A. | 40 |
| B. | 60 |
| C. | 100 |
| D. | 130 |
| Answer» B. 60 | |
| 19. |
Which of the following device acts as an N-P-N and a P-N-P transistor connected base to base and emitter to controller? |
| A. | UJT |
| B. | SCR |
| C. | Diac |
| D. | Triac |
| Answer» C. Diac | |
| 20. |
A differentiating amplifier has capacitor in the input path. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 21. |
Which of the following statement about TRIAC is incorrect? |
| A. | It is not particularly suited to A.C. or mains power control |
| B. | Any one of its main terminals can be used either as cathode or as anode |
| C. | It can be triggered in response to both positive and negative gate terminals |
| D. | None of the above |
| Answer» B. Any one of its main terminals can be used either as cathode or as anode | |
| 22. |
A half wave diode rectifier and full wave diode bridge rectifier both have an input frequency of 50 Hz. The frequencies of outputs respectively are |
| A. | 100 Hz and 50 Hz |
| B. | 50 Hz and 100 Hz |
| C. | 100 Hz each |
| D. | 50 Hz each |
| Answer» C. 100 Hz each | |
| 23. |
The noise figure of FET circuit is |
| A. | independent of the quiescent point |
| B. | dependent on the quiescent point only |
| C. | dependent on the triggering mechanism |
| D. | independent of all above |
| Answer» B. dependent on the quiescent point only | |
| 24. |
The circuit diagram shown in the figure consists of transistors in; |
| A. | parallel connection |
| B. | cascade connection |
| C. | darlington connection |
| D. | series connection |
| Answer» B. cascade connection | |
| 25. |
The encapsulation of transistor is necessary for |
| A. | preventing radio interference |
| B. | preventing photo-emission effects |
| C. | avoiding loss of free electrons |
| D. | mechanical ruggedness |
| Answer» E. | |
| 26. |
The circuit of figure is called |
| A. | current mirror |
| B. | voltage mirror |
| C. | impedance inversion |
| D. | phase splitting |
| Answer» B. voltage mirror | |
| 27. |
In CE approximately, the active region is where the collector curves are |
| A. | almost horizontal |
| B. | almost vertical |
| C. | inclined at 45 |
| D. | inclined at 60 |
| Answer» B. almost vertical | |
| 28. |
Which of the following is non-sinusoidal oscillator? |
| A. | Multivibrator |
| B. | Relaxation oscillator using UJT |
| C. | Relaxation oscillator using tunnel diode |
| D. | Any of the above |
| Answer» B. Relaxation oscillator using UJT | |
| 29. |
Saturation of iron core causes distortion. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 30. |
Which op-amp circuit uses a resistance in series with input and capacitor in feedback path? |
| A. | Differentiating amplifier |
| B. | Integrating amplifier |
| C. | Logarithmic amplifier |
| D. | Exponential amplifier |
| Answer» C. Logarithmic amplifier | |
| 31. |
Low gain-bandwidth product of a JFET is due to |
| A. | reduced number of holes |
| B. | junction capacitive effects |
| C. | low degree of isolation between input and output |
| D. | all of the above |
| Answer» C. low degree of isolation between input and output | |
| 32. |
The circuit of the figure is an example of feedback of the following type |
| A. | current series |
| B. | current shunt |
| C. | voltage series |
| D. | voltage shunt |
| Answer» E. | |
| 33. |
In a transistor IE = 10 mA, ICO = 0.5 A and a = 0.995. Then ICEO = |
| A. | 100 A |
| B. | 25 A |
| C. | 10.1 mA |
| D. | 10.5 mA |
| Answer» B. 25 A | |
| 34. |
Which of the following are linear ICs? |
| A. | RF and IF amplifiers |
| B. | Wide band amplifier |
| C. | Audio amplifiers |
| D. | All of the above |
| Answer» E. | |
| 35. |
The more negative gate voltage, the conductive channel becomes |
| A. | narrower |
| B. | wider |
| C. | thicker |
| D. | linear |
| Answer» B. wider | |
| 36. |
Symbol shown in figure represents a |
| A. | P-channel DMOSFET |
| B. | N-channel DMOSFET |
| C. | UJT with P-type base |
| D. | UJT with N-type base |
| Answer» B. N-channel DMOSFET | |
| 37. |
Figure shows basic Hartley oscillator configuration. Do you think the polarities marked for the split coiled are correct? |
| A. | yes they are |
| B. | no they are not |
| C. | it really doesn't matter |
| D. | none of the above |
| Answer» C. it really doesn't matter | |
| 38. |
A ripple in collector supply voltage of the output stage of amplifier causes noise. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 39. |
The common-drain amplifier, better known as the source follower, has a voltage gain __________ and the output signal is __________ with the input signal. |
| A. | approaching unity, in phase |
| B. | approaching unity, out of phase |
| C. | is very high, in phase |
| D. | is very high, in reverse phase |
| Answer» B. approaching unity, out of phase | |
| 40. |
If the Q of a single-stage single-tuned amplifier is doubled, then its bandwidth will |
| A. | remain same |
| B. | become half |
| C. | become doubled |
| D. | become four times |
| Answer» C. become doubled | |
| 41. |
A boot strap generally incorporates |
| A. | CB configuration |
| B. | CE configuration |
| C. | emitter follower |
| D. | none of the above |
| Answer» D. none of the above | |
| 42. |
Which of the following circuit does not need a coupling capacitor? |
| A. | Resistance loaded |
| B. | Transformer coupled |
| C. | Impedance coupled |
| D. | Single tuned |
| Answer» C. Impedance coupled | |
| 43. |
In case of a transistor amplifier the emitter resistance Re is removed |
| A. | the gain of the amplifier will reduce |
| B. | heat sink will not be required |
| C. | Q-point will become unstable |
| D. | base to emitter function will be less forward biased |
| Answer» D. base to emitter function will be less forward biased | |
| 44. |
Assertion (A): A large negative feedback is deliberately introduced in an amplifier to make its gain independent of variation is in parameters of active device and other components.Reason (R): A large negative feedback results in a high value of return difference compared to unity which makes the feedback gain inversely proportional to feedback factor. |
| A. | Both A and R are correct and R is correct explanation for A |
| B. | Both A and R are correct but R is not correct explanation for A |
| C. | A is correct R is wrong |
| D. | A is wrong R is correct |
| Answer» B. Both A and R are correct but R is not correct explanation for A | |
| 45. |
To draw dc equivalent circuit for a CE amplifier circuit we should |
| A. | Reduce all ac sources to zero |
| B. | Open all capacitors |
| C. | Reduce all ac sources to zero and open all capacitors |
| D. | Reduce all ac sources to zero and short all capacitors |
| Answer» D. Reduce all ac sources to zero and short all capacitors | |
| 46. |
The maximum efficiency of class A amplifier is |
| A. | 100% |
| B. | 81.8% |
| C. | 50% |
| D. | 40% |
| Answer» D. 40% | |
| 47. |
In oscillators class C operation is preferred because |
| A. | is most efficient |
| B. | has frequency stability |
| C. | gives larger output |
| D. | it produces nearly square waves |
| Answer» E. | |
| 48. |
In a common emitter circuit all voltages are measured with respect to |
| A. | base |
| B. | emitter |
| C. | collector |
| D. | base or collector |
| Answer» C. collector | |
| 49. |
For the high-pass circuit to act as a differentiator, the time constant must be |
| A. | small |
| B. | very small in comparison to the time period of the input signal |
| C. | very high in comparison to the time period of the input signal (that is low pass circuit) |
| D. | moderate value |
| Answer» C. very high in comparison to the time period of the input signal (that is low pass circuit) | |
| 50. |
With JFETs cascade means |
| A. | a common source driving a common gate connection |
| B. | a common gate driving a common source connection |
| C. | two FETs connected in parallel |
| D. | none of the above |
| Answer» B. a common gate driving a common source connection | |