MCQOPTIONS
Saved Bookmarks
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.
| 1951. |
Which junction transistor is preferred for high input and low output impedances? |
| A. | Common emitter |
| B. | Common base |
| C. | Common collector |
| D. | Any of the above |
| Answer» D. Any of the above | |
| 1952. |
In high frequency region, an amplifier behaves like a |
| A. | band pass filter |
| B. | low pass filter |
| C. | high pass filter |
| D. | any of the above |
| Answer» C. high pass filter | |
| 1953. |
A generator with an internal resistance of 600 Ω drives an amplifier whose input resistance is 400 Ω. The generator's open circuit voltages is 1 mV; the amplifier develops 100mV across an 8kΩ load. The voltage multiplication is |
| A. | 25 |
| B. | 50 |
| C. | 125 |
| D. | 250 |
| Answer» E. | |
| 1954. |
For operation of enhancement only N-channel MOSFET, value of gate voltage has to be |
| A. | zero |
| B. | low positive |
| C. | high negative |
| D. | high positive |
| Answer» E. | |
| 1955. |
Sweep voltage generators, sweep current generators, multivibrators and blocking oscillators can be combined as |
| A. | negative resistance oscillators |
| B. | tuned base tuned collector oscillators |
| C. | relaxation oscillators |
| D. | L-C tuned oscillators |
| Answer» D. L-C tuned oscillators | |
| 1956. |
Class C operation finds application in |
| A. | RF power amplifiers |
| B. | frequency multipliers |
| C. | both (a) and (b) |
| D. | neither (a) nor (b) |
| Answer» D. neither (a) nor (b) | |
| 1957. |
In the circuit shown in the figure |
| A. | only red will glow |
| B. | only green will glow |
| C. | both red and green will glow |
| D. | none will glow |
| Answer» B. only green will glow | |
| 1958. |
In a CE amplifier circuit the load resistance is open circuited. The output voltage will |
| A. | increase |
| B. | decrease |
| C. | become zero |
| D. | increase or decrease |
| Answer» B. decrease | |
| 1959. |
The transformer cores operating at microwave frequency ranges are generally made up of |
| A. | silicon steel |
| B. | ferrites |
| C. | albino |
| D. | super alloy |
| Answer» C. albino | |
| 1960. |
Assertion (A): Direct coupled amplifiers are rarely usedReason (R): Direct coupled amplifiers suffer from the disadvantage of drift |
| 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 | |
| 1961. |
Emitter follower is in which of following configuration. |
| A. | common Base |
| B. | common Emitter |
| C. | common collector |
| D. | common Base or common Emitter |
| Answer» D. common Base or common Emitter | |
| 1962. |
In a practical oscillator, the magnitude of loop gain A is kept slightly larger than unity and the amplitude of oscillations is limited by |
| A. | the ratio of A to |
| B. | the on set of non-linearity of amplifying device |
| C. | the linearity of amplifying device |
| D. | all of the above |
| Answer» C. the linearity of amplifying device | |
| 1963. |
In a feedback series regular circuit, the output voltage is regulated by controlling the |
| A. | magnitude of the I/P voltage |
| B. | gain of the feed back BJT |
| C. | reference Voltage |
| D. | voltage drop across the series pass transistor |
| Answer» E. | |
| 1964. |
The linear transistor circuits always operate in the |
| A. | saturation |
| B. | cut off |
| C. | active |
| D. | inactive |
| Answer» D. inactive | |
| 1965. |
In the graphical analysis of CE amplifier circuit, the intersection of base current and dc load line is called |
| A. | saturation point |
| B. | cut off point |
| C. | Q point |
| D. | operating point |
| Answer» D. operating point | |
| 1966. |
In an amplifier circuit the emitter is at ac ground potential in a |
| A. | CB circuit |
| B. | CC circuit |
| C. | CE circuit |
| D. | both CB and CE circuit |
| Answer» D. both CB and CE circuit | |
| 1967. |
An ideal op-amp has |
| A. | infinite input and output resistance |
| B. | low input and output resistance |
| C. | low input and high output resistance |
| D. | infinite input resistance and zero output resistance |
| Answer» E. | |
| 1968. |
A class B amplifier is biased just at cutoffhas a high theoretical efficiency of 78.5% because its quiescent current is lowis biased at midpoint of load line Of the above statements |
| A. | 2 and 3 are correct |
| B. | 1 alone is correct |
| C. | 1 and 2 are correct |
| D. | 2 alone is correct |
| Answer» E. | |
| 1969. |
In CE circuit the parameter f12 is very small. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 1970. |
In which amplifier circuit is gate conductance negligible? |
| A. | JFET amplifier |
| B. | MOSFET amplifier |
| C. | Both JFET and MOSFET amplifier |
| D. | None of the above |
| Answer» C. Both JFET and MOSFET amplifier | |
| 1971. |
The phase angle of lead circuit is |
| A. | between 0 and -90 |
| B. | between 0 and +90 |
| C. | 90 |
| D. | more than 90 |
| Answer» C. 90 | |
| 1972. |
A generator with an internal resistance of 600 Ω drives an amplifier whose input resistance is 400 Ω. The generator's open circuit voltages is 1 mV; the amplifier develops 100mV across an 8kΩ load. The power gain is |
| A. | 125 |
| B. | 250 |
| C. | 1125 |
| D. | 3125 |
| Answer» E. | |
| 1973. |
The circuit of figure is |
| A. | clipper, sine wave clipped at - 2 V |
| B. | clamper |
| C. | clamper, sine wave clamped at zero V |
| D. | clipper, sine wave clipped at + 2 V |
| Answer» C. clamper, sine wave clamped at zero V | |
| 1974. |
In a good voltage amplifier, its input impedance |
| A. | must be high compared to the resistance of the source |
| B. | must be low compared to the resistance of the source |
| C. | must be equal to the resistance of the source |
| D. | must be half the resistance of the source |
| Answer» B. must be low compared to the resistance of the source | |
| 1975. |
The upper end of the d.c. load line is called the __________ point and the lower end is the __________ point. |
| A. | cut off, saturation |
| B. | saturation, active |
| C. | saturation, cut off |
| D. | active saturation |
| Answer» D. active saturation | |
| 1976. |
A non-inverting voltage feedback amplifier is a |
| A. | voltage amplifier |
| B. | current amplifier |
| C. | current to voltage converter |
| D. | voltage to current converter |
| Answer» B. current amplifier | |
| 1977. |
In every practical oscillator, the loop gain is slightly larger than unity and the amplitude of the oscillations is limited by the |
| A. | magnitude of the loop gain |
| B. | onset if non-linearity |
| C. | magnitude of gain of the amplifier |
| D. | feedback transmission factor |
| Answer» C. magnitude of gain of the amplifier | |
| 1978. |
In CE amplifier |
| A. | input and output are in phase |
| B. | phase difference between input and output is 30 to 90 |
| C. | phase difference between input and output is 60 to 120 |
| D. | output is inverted with respect to its input voltage |
| Answer» E. | |
| 1979. |
Efficiency of a half wave diode rectifier is less than 40%. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 1980. |
In a transistor with normal bias |
| A. | the emitter junction has a low resistance |
| B. | the emitter junction has a very high resistance |
| C. | the emitter junction supplies majority carries into the base region |
| D. | none of the above |
| Answer» B. the emitter junction has a very high resistance | |
| 1981. |
The equivalent circuit of an op-amp has |
| A. | a virtual ground at input |
| B. | a virtual ground at output |
| C. | virtual ground at input as well as at output |
| D. | none of the above |
| Answer» B. a virtual ground at output | |
| 1982. |
Generally op amp is used in |
| A. | open loop |
| B. | closed loop |
| C. | cascaded loop |
| D. | either (a) or (c) |
| Answer» C. cascaded loop | |
| 1983. |
A transistor has collectoremitterbase In a N-P-N transistor the electron flow into the transistor at |
| A. | I only |
| B. | II only |
| C. | II and III only |
| D. | I and II only |
| Answer» E. | |
| 1984. |
Which of the following circuit would be preferred for a 355 KHz IF amplifier? |
| A. | Resistance loaded |
| B. | Double tuned transformer |
| C. | Video amplifier |
| D. | Class C |
| Answer» C. Video amplifier | |
| 1985. |
The circuit consisting of two transistor connected in series with the d.c. supply voltage is called |
| A. | push pull |
| B. | differential pair |
| C. | stacked V |
| D. | <sup>+</sup> |
| E. | complementary symmetry |
| Answer» D. <sup>+</sup> | |
| 1986. |
Assertion (A): In CC amplifier the collector is at ac ground Reason (R): CC amplifier is also called emitter follower |
| 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 | |
| 1987. |
Common emitter transistor has |
| A. | high current and high voltage gain |
| B. | low current gain and low voltage gain |
| C. | high current gain and low voltage gain |
| D. | low current and voltage gain |
| Answer» B. low current gain and low voltage gain | |
| 1988. |
For a sinusoidal input, the circuit shown in the figure will act as a |
| A. | Pulse generator |
| B. | Full wave rectifier |
| C. | Ramp generator |
| D. | Voltage Doubler |
| Answer» C. Ramp generator | |
| 1989. |
A multivibrator can be used as a |
| A. | cavity resonator |
| B. | harmonic generator |
| C. | wave form modifier |
| D. | any of the above |
| Answer» D. any of the above | |
| 1990. |
A multivibrator generates |
| A. | sinusoidal waveforms |
| B. | non-sinusoidal waveforms |
| C. | both (a) and (b) |
| D. | none of the above |
| Answer» C. both (a) and (b) | |
| 1991. |
The derating factor, for ambient temperature higher than specified, for a transistor is about |
| A. | 2.5 mW/ C |
| B. | 0.5 mW/ C |
| C. | 10 mW/ C |
| D. | 20 mW/ C |
| Answer» B. 0.5 mW/ C | |
| 1992. |
In figure the potential of gate terminal is |
| A. | 4 V |
| B. | -4 V |
| C. | 0 |
| D. | 20 V |
| Answer» D. 20 V | |
| 1993. |
The gate-source voltage that reduces the drain current to approximately zero is called |
| A. | gate-source on voltage |
| B. | gate-source voltage |
| C. | pinch-off voltage |
| D. | gate-source cut-off voltage |
| Answer» D. gate-source cut-off voltage | |
| 1994. |
In figure the source resistance of current source IEE is infinite, then common mode gain is |
| A. | infinite |
| B. | zero |
| C. | indeterminate |
| D. | <img src="/_files/images/electronics-and-communication-engineering/analog-electronics/328-439-2.png"> |
| Answer» B. zero | |
| 1995. |
Class A amplifiers are preferred when |
| A. | minimum distortion is required |
| B. | maximum voltage gain is required |
| C. | output signal is desired in phase with input signal |
| D. | signal having A.C. superimposed on D.C. are to be amplified |
| Answer» B. maximum voltage gain is required | |
| 1996. |
In a half wave voltage doubler circuit the input frequency is 50 Hz. The ripple frequency is |
| A. | 25 Hz |
| B. | 50 Hz |
| C. | 100 Hz |
| D. | 150 Hz |
| Answer» C. 100 Hz | |
| 1997. |
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 | |
| 1998. |
Ebers Moll model is applicable to |
| A. | bipolar Junction transistor |
| B. | N MOS transistor |
| C. | unipolar junction transistor |
| D. | field effect transistor |
| Answer» B. N MOS transistor | |
| 1999. |
A FET |
| A. | has two P-N junctions |
| B. | has three P-N junctions |
| C. | depends on the variation of the depletion layer width with reverse voltage, for its operation |
| D. | depends on the variation of a magnetic field for its operation |
| Answer» C. depends on the variation of the depletion layer width with reverse voltage, for its operation | |
| 2000. |
For oscillations to starts, the loop gain A of the oscillator must be initially |
| A. | less than unity |
| B. | 0.5 |
| C. | 1.0 |
| D. | more than unity |
| Answer» E. | |