MCQOPTIONS
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MCQOPTIONS
This section includes 9294 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 2001. |
A transistor amplifier with 85% efficiency is expected to be |
| A. | class A |
| B. | class B |
| C. | class C |
| D. | class AB |
| Answer» D. class AB | |
| 2002. |
If the changes in zener current in a voltage regulator circuit are too large, it can be corrected by using a |
| A. | emitter follower |
| B. | CE amplifier |
| C. | capacitor |
| D. | either (a) or (b) |
| Answer» B. CE amplifier | |
| 2003. |
The circuit of figure is called |
| A. | diode bias |
| B. | current mirror |
| C. | complementary mirror |
| D. | none of the above |
| Answer» D. none of the above | |
| 2004. |
The purpose of using negative feedback in a op-amps is to |
| A. | stabilize overall gain |
| B. | increase output |
| C. | stabilize overall gain and increase output |
| D. | increase output and decrease input |
| Answer» B. increase output | |
| 2005. |
In the case of the circuit shown in the figure Vio = 10 mV dc maximum, the maximum possible output offset voltage Voo caused by the input offset voltage Vio with respect to ground is |
| A. | 60 mV dc |
| B. | 110 mV dc |
| C. | 130 mV dc |
| D. | 150 mV dc |
| Answer» D. 150 mV dc | |
| 2006. |
The advantage of transistor over vacuum tube is |
| A. | no heat is required |
| B. | small size and light in weight |
| C. | very low power consumption |
| D. | all of the above |
| Answer» E. | |
| 2007. |
CMOS is widely used in |
| A. | digital wrist watches |
| B. | analog circuits |
| C. | high power circuits |
| D. | all of the above |
| Answer» B. analog circuits | |
| 2008. |
Which of the following is necessary transistor action? |
| A. | The base region must be very wide |
| B. | The base region must be very narrow |
| C. | The base region must be made of some insulating material |
| D. | The collector region must be heavily doped |
| Answer» C. The base region must be made of some insulating material | |
| 2009. |
Oscillation frequency in colpitt's oscillator is |
| A. | <img src="/_files/images/electronics-and-communication-engineering/analog-electronics/331-487-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/analog-electronics/331-487-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/analog-electronics/331-487-3.png"> |
| D. | none of these |
| Answer» B. <img src="/_files/images/electronics-and-communication-engineering/analog-electronics/331-487-2.png"> | |
| 2010. |
A JFET can operate on |
| A. | enhancement mode only |
| B. | depletion mode only |
| C. | both depletion as well as enhancement modes |
| D. | neither depletion nor enhancement mode |
| Answer» C. both depletion as well as enhancement modes | |
| 2011. |
A distorted sinusoidal has the amplitudes A1, A2, A3 ... of the fundamental, second, harmonic third harmonic, ... respectively. The total harmonic distortion is |
| A. | <img src="/_files/images/electronics-and-communication-engineering/analog-electronics/335-542-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/analog-electronics/335-542-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/analog-electronics/335-542-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/analog-electronics/335-542-4.png"> |
| Answer» C. <img src="/_files/images/electronics-and-communication-engineering/analog-electronics/335-542-3.png"> | |
| 2012. |
Which of the following is the point of reference JFET? |
| A. | Drain |
| B. | Gate |
| C. | Source |
| D. | None of the above |
| Answer» D. None of the above | |
| 2013. |
A Darlington pair consist of |
| A. | two CB amplifiers |
| B. | two CC amplifiers |
| C. | two cascaded CC amplifiers |
| D. | two cascaded CE amplifiers |
| Answer» D. two cascaded CE amplifiers | |
| 2014. |
MOS circuits as compared to bipolar circuits take |
| A. | more chip area |
| B. | less chip area |
| C. | same chip area |
| D. | none of these |
| Answer» C. same chip area | |
| 2015. |
Typical values of voltage gain for CE, CB and CC amplifiers are |
| A. | 100, 100 and 1 respectively |
| B. | 100, 1 and 100 respectively |
| C. | 100, 1 and 1 respectively |
| D. | 1, 100 and 100 respectively |
| Answer» B. 100, 1 and 100 respectively | |
| 2016. |
For a transistor if adc = 0.98 and emitter current IE is 2 mA, then collector current will be |
| A. | 0.44 mA |
| B. | 0.88 mA |
| C. | 1.96 mA |
| D. | 3.32 mA |
| Answer» C. 1.96 mA | |
| 2017. |
Which of the following is not the main characteristic of a FET? |
| A. | Drain resistance |
| B. | Forward transconductance |
| C. | Temperature stability |
| D. | Amplification factor |
| Answer» D. Amplification factor | |
| 2018. |
The basic amplifier in Weinbridge oscillator consists of |
| A. | CE stage followed by CE |
| B. | CE stage followed by CB |
| C. | CB stage followed by CE |
| D. | CC stage followed by CE |
| Answer» B. CE stage followed by CB | |
| 2019. |
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. | |
| 2020. |
To obtain very high I/P and O/P impedances in a feedback amplifier, the topology used is |
| A. | voltage series |
| B. | current series |
| C. | voltage shunt |
| D. | current shunt |
| Answer» C. voltage shunt | |
| 2021. |
The collector voltage VC of the circuit shown in the given figure aside is approximately |
| A. | 2 V |
| B. | 4.6 V |
| C. | 8 V |
| D. | 8.6 V |
| Answer» C. 8 V | |
| 2022. |
The symbol shown in figure represents a |
| A. | P-channel MOSFET |
| B. | UJT with N-type base |
| C. | N-channel DEMOSFET with internal zener protection |
| D. | P-channel DEMOSFET with internal zener protection |
| Answer» D. P-channel DEMOSFET with internal zener protection | |
| 2023. |
The phase angle of a lag circuit is |
| A. | between 0 and -90 |
| B. | between 0 and +90 |
| C. | 90 |
| D. | more than 90 |
| Answer» C. 90 | |
| 2024. |
The transistor specification number 2N refers to |
| A. | triac |
| B. | diac |
| C. | junction transistor |
| D. | FET with one gate |
| Answer» D. FET with one gate | |
| 2025. |
IF amplifiers for radio receivers are often tuned to |
| A. | 456 Hz |
| B. | 456 kHz |
| C. | 3456 MHz |
| D. | 456 GHz |
| Answer» C. 3456 MHz | |
| 2026. |
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) | |
| 2027. |
Which of the following represents the equivalent circuit of a crystal for crystal oscillator? |
| A. | Figure A |
| B. | Figure B |
| C. | Figure C |
| D. | None of the above |
| Answer» D. None of the above | |
| 2028. |
Stability factor for S is given by for a fixed bias |
| A. | 1 + |
| B. | 1 - |
| C. | 1/ |
| D. | - 1 |
| Answer» B. 1 - | |
| 2029. |
Which of the following combinations has no phase inversion of the signal? |
| A. | Two CE stages |
| B. | CE and CC stages |
| C. | Three CE stages |
| D. | CE stages and emitter follower |
| Answer» B. CE and CC stages | |
| 2030. |
In a CE transistor amplifier, when collector-emitter voltage increases |
| A. | the instantaneous operating point moves up the load line |
| B. | the instantaneous operating point moves down the line |
| C. | load current increases |
| D. | none of the above |
| Answer» B. the instantaneous operating point moves down the line | |
| 2031. |
In figure, VC is approximately equal to |
| A. | 2 V |
| B. | 4.6 V |
| C. | 8 V |
| D. | 7.6 V |
| Answer» D. 7.6 V | |
| 2032. |
In a Darlington pair |
| A. | the emitter of first transistor drives the base of the second |
| B. | the base of the first transistor drives the emitter of the second |
| C. | emitters of the two transistors are connected through a resistor |
| D. | none of the above |
| Answer» B. the base of the first transistor drives the emitter of the second | |
| 2033. |
In CC configuration, the output signals has approximately |
| A. | the same amplitude and phase |
| B. | opposite amplitude and phase |
| C. | same amplitude but opposite phase |
| D. | none of the above |
| Answer» B. opposite amplitude and phase | |
| 2034. |
The PIV of a bridge rectifier is less than that of full wave rectifier with centre tapped transformer. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 2035. |
Zero bias works only with |
| A. | D MOSFETs |
| B. | E MOSFETs |
| C. | both D and E MOSFETs |
| D. | neither D nor E MOSFETs |
| Answer» B. E MOSFETs | |
| 2036. |
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 | |
| 2037. |
A BJT amplifier has a power gain of 0.5 from source to base. The power gain in dB is |
| A. | -0.3 dB |
| B. | -3 dB |
| C. | -6 dB |
| D. | -10 dB |
| Answer» C. -6 dB | |
| 2038. |
A rectifier circuit has load resistance R. It uses a capacitance filter having capacitance C. For low ripple in the output |
| A. | RC should be 1 |
| B. | RC should be low |
| C. | RC should be high |
| D. | RC should be neither low nor high |
| Answer» D. RC should be neither low nor high | |
| 2039. |
In graphical analysis of BJT amplifier the slope of ac line is more than that of dc load line. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 2040. |
Which circuit is called emitter follower? |
| A. | CC |
| B. | CE |
| C. | CB |
| D. | Both (a) and (b) |
| Answer» B. CE | |
| 2041. |
In a CE amplifier circuit, the output voltage |
| A. | is very small |
| B. | is always constant |
| C. | depends on |
| D. | none of the above |
| Answer» D. none of the above | |
| 2042. |
Assertion (A): Manufacturer's quote h parameters of transistor Reason (R): h parameters of a transistor are easiest to measure |
| 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 | |
| 2043. |
Which of the following best represents the output impedance of an actual op-amp? |
| A. | 10 ohm |
| B. | 100 ohm |
| C. | 10 k ohm |
| D. | 100 k ohm |
| Answer» C. 10 k ohm | |
| 2044. |
Wien bridge uses |
| A. | lead network |
| B. | lag network |
| C. | lead-lag network |
| D. | Both (a) and (b) |
| Answer» D. Both (a) and (b) | |
| 2045. |
The P-type substrate in a conventional pn Junction isolated integrated circuits should be connected to |
| A. | any where |
| B. | a dc ground potential |
| C. | the most positive potential available in the circuit |
| D. | the most negative potential available in the circuit |
| Answer» D. the most negative potential available in the circuit | |
| 2046. |
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 | |
| 2047. |
In a Hartley oscillator the condition for sustained oscillations is . If there exists mutual inductance M between coils L1 and L2, then the above condition will get modified as hfe |
| A. | <img src="/_files/images/electronics-and-communication-engineering/analog-electronics/355-946-2.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/analog-electronics/355-946-3.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/analog-electronics/355-946-4.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/analog-electronics/355-946-5.png"> |
| Answer» D. <img src="/_files/images/electronics-and-communication-engineering/analog-electronics/355-946-5.png"> | |
| 2048. |
A FET has |
| A. | very high input resistance |
| B. | very low input resistance |
| C. | high connection emitter junction |
| D. | forward biased PN junction |
| Answer» B. very low input resistance | |
| 2049. |
Figure shows current pulses of a class C power amplifier. The fundamental frequency of these pulses is |
| A. | 100 kHz |
| B. | 1000 kHz |
| C. | 10 kHz |
| D. | 1 kHz |
| Answer» B. 1000 kHz | |
| 2050. |
The Clapp oscillator shown in figure will operate at |
| A. | 4.6 kHz |
| B. | 46 kHz |
| C. | 460 kHz |
| D. | 4600 kHz |
| Answer» D. 4600 kHz | |