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MCQOPTIONS
This section includes 1136 Mcqs, each offering curated multiple-choice questions to sharpen your Electronics & Communication Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 851. |
In figure ID = 4 mA. Then VS = |
| A. | 20 V |
| B. | 4.4 V |
| C. | 0.4 V |
| D. | 0.44 V |
| Answer» C. 0.4 V | |
| 852. |
An amplifier has a large ac input signal. The clipping occurs on both the peaks. The output voltage will be nearly a |
| A. | sine wave |
| B. | square wave |
| C. | triangular wave |
| D. | (a) or (c) |
| Answer» C. triangular wave | |
| 853. |
The properties of FETs resemble closely to |
| A. | UJT |
| B. | current transformer |
| C. | thyristor |
| D. | thermionic valves |
| Answer» E. | |
| 854. |
For the amplifier in figure, β = 800. The mid-band voltage gain V0/Vi is |
| A. | 0 |
| B. | < 1 |
| C. | ≈ 1 |
| D. | 800 |
| Answer» D. 800 | |
| 855. |
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 | |
| 856. |
Figure shows the self bias circuit for CE amplifier and its equivalent circuit. VBB and RB respectively are |
| A. | 10 V and 4 k ohm |
| B. | 5 V and 4 k ohm |
| C. | 2 V and 4 k ohm |
| D. | 2 V and 10 k ohm |
| Answer» D. 2 V and 10 k ohm | |
| 857. |
Which power amplifier can deliver maximum load power? |
| A. | Class A |
| B. | Class AB |
| C. | Class B |
| D. | Class C |
| Answer» E. | |
| 858. |
The enhancement type MOSFET is called a |
| A. | normally on MOSFET |
| B. | normally off MOSFET |
| C. | P-type MOSFET |
| D. | N-type MOSFET |
| Answer» C. P-type MOSFET | |
| 859. |
In each of circuits below, indicate which diode is conducting? |
| A. | Figure A |
| B. | Figure B |
| C. | Figure C |
| D. | All the three |
| Answer» E. | |
| 860. |
Values of VT at 20°C for an ideal P-N diode |
| A. | 25.27 mV |
| B. | 30.3 mV |
| C. | 23 mV |
| D. | 50 mV |
| Answer» B. 30.3 mV | |
| 861. |
If the value of C2 and C3 are doubled, the oscillation frequency will be |
| A. | quadrupled |
| B. | doubled |
| C. | unchanged |
| D. | halved |
| Answer» D. halved | |
| 862. |
Saturation region of a JFET is also known as |
| A. | source region |
| B. | analog region |
| C. | pinch off region |
| D. | ohmic region |
| Answer» E. | |
| 863. |
Harmonic distortion in CB amplifier may be least when the load resistance is |
| A. | negligible |
| B. | very low |
| C. | very high |
| D. | infinite |
| Answer» D. infinite | |
| 864. |
A non-inverting op-amp summer is shown in figure, the output voltage V0 is |
| A. | |
| B. | 3 sin (100t) |
| C. | sin (100t) |
| Answer» B. 3 sin (100t) | |
| 865. |
Which of the following is not necessarily the advantages of a push pull amplifier? |
| A. | It gives more output |
| B. | It removes odd a well as even harmonics |
| C. | There is no effect of ripple of the power supply |
| D. | It consumes least power |
| Answer» C. There is no effect of ripple of the power supply | |
| 866. |
The configuration of figure is a |
| A. | Hartley oscillator |
| B. | Precision Integrator |
| C. | Wienbridge oscillator |
| D. | Butterworth high pass filter |
| Answer» D. Butterworth high pass filter | |
| 867. |
The emitter follower steps up the impedance by a factor of |
| A. | a |
| B. | β |
| C. | a β |
| D. | a/β |
| Answer» C. a Œ≤ | |
| 868. |
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. | |
| 869. |
Negative feedback is used in audio amplifiers to |
| A. | operate class C |
| B. | reduce distortion |
| C. | increase distortion |
| D. | increase gain |
| Answer» C. increase distortion | |
| 870. |
Which of the following circuit can operate class AB for audio power output? |
| A. | Push pull |
| B. | Cascade |
| C. | Pull down |
| D. | Darlington pair |
| Answer» B. Cascade | |
| 871. |
In the circuit shown in the given figure, the current flowing through resistance of 100 Ω would be |
| A. | 8 mA |
| B. | 10 mA |
| C. | 20 mA |
| D. | 100 mA |
| Answer» B. 10 mA | |
| 872. |
In the analysis of common emitter amplifier we may neglect |
| A. | hre |
| B. | hoe |
| C. | hfe |
| D. | hie |
| Answer» B. hoe | |
| 873. |
In figure gain bandwidth product is |
| A. | 200 Hz |
| B. | 200 MHz |
| C. | 200 kHz |
| D. | 2 MHz |
| Answer» D. 2 MHz | |
| 874. |
An amplifier signal is made up of just two frequencies 1000 Hz. The output signal consists of 500 Hz and 25000 Hz frequencies. This may be attributed to |
| A. | harmonic distortion |
| B. | intermodulation distortion |
| C. | both (a) and (b) |
| D. | none of the above |
| Answer» C. both (a) and (b) | |
| 875. |
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. | |
| 876. |
In the circuit of figure both diodes are ideal. If v1 = 10 V and v2 = 10 V which diode will conduct? |
| A. | D1 only |
| B. | D2 only |
| C. | Both D1 and D2 |
| D. | Neither D1 nor D2 |
| Answer» D. Neither D1 nor D2 | |
| 877. |
Which of the following parameters of CE circuit has the unit of ohms? |
| A. | hie |
| B. | hre |
| C. | hfe |
| D. | hoe |
| Answer» B. hre | |
| 878. |
A capacitor input filter relies on |
| A. | average detection |
| B. | peak detection |
| C. | both (a) and (b) |
| D. | neither (a) nor (b) |
| Answer» C. both (a) and (b) | |
| 879. |
In figure Vi may vary from 15 to 20 V and load current may vary from 20 mA to 100 mA. Suitable maximum value of R is |
| A. | 20 Ω |
| B. | 50 Ω |
| C. | 100 Ω |
| D. | 200 Ω |
| Answer» C. 100 Œ© | |
| 880. |
Which of the following components is essential for a voltage multiplier circuit? |
| A. | Resistor |
| B. | Inductor |
| C. | Capacitor |
| D. | Both (a) and (c) |
| Answer» D. Both (a) and (c) | |
| 881. |
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 | |
| 882. |
In a CE amplifier the input impedance is equal to the ratio of |
| A. | ac base voltage to ac base current |
| B. | ac base voltage to ac emitter current |
| C. | ac emitter voltage to ac collector current |
| D. | ac collector voltage to ac collector current |
| Answer» B. ac base voltage to ac emitter current | |
| 883. |
CE mode input V-I characteristic can be shown by a plot of |
| A. | VBE versus iB for constant values of VCE |
| B. | VCB versus iC for constant values of IE |
| C. | VCE versus iE for constant values of VEB |
| D. | VCE versus iE for constant values of VCE |
| Answer» B. VCB versus iC for constant values of IE | |
| 884. |
An ideal op-amp has zero slew rate. |
| A. | 1 |
| B. | |
| C. | 7.07 V |
| D. | 14.14 V |
| Answer» C. 7.07 V | |
| 885. |
A three terminal monolithic IC regulator can be used as |
| A. | an a adjustable output voltage regulator alone |
| B. | an adjustable output voltage regulator & a current regulator |
| C. | a current regulator & a power switch |
| D. | a current regulator alone |
| Answer» E. | |
| 886. |
Class A and Class B power amplifiers predominate at |
| A. | audio frequencies |
| B. | radio frequencies |
| C. | all frequencies |
| D. | audio and radio frequency |
| Answer» B. radio frequencies | |
| 887. |
The emitter bias largely depends on |
| A. | gain |
| B. | signal input |
| C. | IE |
| D. | none of the above |
| Answer» D. none of the above | |
| 888. |
CMRR is the ratio of differential voltage gain to common mode gain. |
| A. | 1 |
| B. | |
| C. | high efficiency |
| D. | reduce distortion |
| Answer» B. | |
| 889. |
Figure represents |
| A. | Integrator |
| B. | Differentiator |
| C. | High Pass Filter |
| D. | Band Pass Filter |
| Answer» B. Differentiator | |
| 890. |
If an amplifier with gain of - 100 and feedback of β = - 0.1 has a gain change of 20% due to temperature the change in gain of the feedback amplifier will be |
| A. | 0.0002 |
| B. | 0.02 |
| C. | 0.001 |
| D. | 0.0001 |
| Answer» C. 0.001 | |
| 891. |
In a negative feedback amplifier A = 100, β = 0.04 and Vs = 50 mV, then feedback will be |
| A. | 4 |
| B. | 8 |
| C. | 10 |
| D. | 2 |
| Answer» B. 8 | |
| 892. |
Which of the following number specification refers to FET with one gate? |
| A. | 2N |
| B. | 3N |
| C. | 3Y |
| D. | 3X |
| Answer» C. 3Y | |
| 893. |
In an op-amp comparator, the positive or negative output is |
| A. | saturated |
| B. | amplifier |
| C. | unsaturated |
| D. | any of the above |
| Answer» B. amplifier | |
| 894. |
funity of an op-amp is about 1 kHz. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 895. |
Assertion (A): For large signal variations an amplifier circuit has to be analysed graphicallyReason (R): The output characteristics of a transistor is nonlinear. |
| 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 | |
| 896. |
A TRIAC is a semiconductor device which acts as a |
| A. | 2 terminal unidirectional switch |
| B. | 2 terminal bidirectional switch |
| C. | 3 terminal bidirectional switch |
| D. | 4 terminal multidirectional switch |
| Answer» D. 4 terminal multidirectional switch | |
| 897. |
Si transistor of following figure has a = 0.9 and ICE= 0, VEE = 5 V and VCC = 13 V, then RE will be if IEQ = 1 mA |
| A. | 3 kΩ |
| B. | 4 kΩ |
| C. | 5 kΩ |
| D. | 4.3 kΩ |
| Answer» E. | |
| 898. |
The linear transistor circuits always operate in the |
| A. | saturation |
| B. | cut off |
| C. | active |
| D. | inactive |
| Answer» D. inactive | |
| 899. |
In the case of the circuit shown in the figure, the collector current IC will be, if β = 100, VBE = 0.7 V, ICO = 0.1 βA at 20°C |
| A. | 2.26 mA |
| B. | 1.85 mA |
| C. | 0.357 mA |
| D. | 0.185 mA |
| Answer» B. 1.85 mA | |
| 900. |
Overall efficiency of class B amplifier is |
| A. | 0.72 |
| B. | 0.75 |
| C. | 0.785 |
| D. | 0.7 |
| Answer» D. 0.7 | |