MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 2171 Mcqs, each offering curated multiple-choice questions to sharpen your ENGINEERING SERVICES EXAMINATION (ESE) knowledge and support exam preparation. Choose a topic below to get started.
| 1951. |
Two transistors have same value of a but different gain (G) bandwidth (B) product. The transistors have similar geometry. However one of them is germanium and the other is silicon. The transistor with lower GB product |
| A. | is germanium |
| B. | is silicon |
| C. | may be either of two |
| D. | cannot be identified on the basis of above data |
| Answer» C. may be either of two | |
| 1952. |
Figure represents a |
| A. | JFET shunt switching circuit |
| B. | JFET series switching circuit |
| C. | JFET analog switch |
| D. | multiplexing |
| Answer» B. JFET series switching circuit | |
| 1953. |
The input gate current of FET is closer to |
| A. | few amperes |
| B. | few milli amperes |
| C. | few microamperes |
| D. | negligibly smaller value |
| Answer» E. | |
| 1954. |
The depletion type MOSFET can operate in |
| A. | depletion mode only |
| B. | enhancement mode only |
| C. | depletion or enhancement mode |
| D. | neither depletion nor enhancement mode |
| Answer» D. neither depletion nor enhancement mode | |
| 1955. |
Assertion (A): The ac load line is different from dc load lineReason (R): The ac load resistance seen by collector and emitter is different from dc load resistance |
| 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 | |
| 1956. |
An amplifier has input impedance of 4 kΩ and output impedance of 80 kΩ. It is used in negative feedback circuit with 10% feedback. If open loop gain is 90, the closed loop input and output impedances are |
| A. | 40 kΩ and 8 kΩ respectively |
| B. | 4 kΩ and 80 kΩ respectively |
| C. | 0.4 kΩ and 800 kΩ respectively |
| D. | 8 kΩ and 160 kΩ respectively |
| Answer» B. 4 kΩ and 80 kΩ respectively | |
| 1957. |
FET amplifier is more difficult to analyse than BJT amplifier. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» C. May be True or False | |
| 1958. |
In a BJT CE amplifier circuit the value of coupling capacitor should be such that |
| A. | its reactance is small for the lowest frequency in the input and output |
| B. | its reactance is high for the lowest frequency in the input and output |
| C. | its reactance is zero for the lowest frequency in the input and output |
| D. | its reactance is infinite for the lowest frequency in the input and output |
| Answer» B. its reactance is high for the lowest frequency in the input and output | |
| 1959. |
Generally the gain of a transistor amplifier falls at high frequencies due to the |
| A. | internal capacitance of device |
| B. | coupling capacitor at the I/P |
| C. | skin effect |
| D. | coupling capacitor at the O/P |
| Answer» B. coupling capacitor at the I/P | |
| 1960. |
Percentage increase in the reverse saturation current of a diode if the temperature is increased from 25°C to 50°C |
| A. | 50% |
| B. | 500% |
| C. | 565.7% |
| D. | 575.6% |
| Answer» D. 575.6% | |
| 1961. |
Output of a phase splitter is |
| A. | a pair of sine waves of unequal amplitude |
| B. | a pair of sine waves of equal amplitudes |
| C. | a pair of sine waves of equal amplitudes and opposite phase |
| D. | a pair of sine waves of unequal amplitudes and opposite phase |
| Answer» D. a pair of sine waves of unequal amplitudes and opposite phase | |
| 1962. |
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 | |
| 1963. |
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 | |
| 1964. |
Assertion (A): Negative feedback reduces the bandwidth of an amplifier Reason (R): Negative feedback stabilizes the gain of an amplifier |
| 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» E. | |
| 1965. |
The maximum theoretical efficiency for class A amplifier is |
| A. | 12.5% |
| B. | 25% |
| C. | 50% |
| D. | 75% |
| Answer» C. 50% | |
| 1966. |
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 | |
| 1967. |
An integrating amplifier has resistance in feedback path. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» C. May be True or False | |
| 1968. |
The current ICBO |
| A. | increases with increases in temperature |
| B. | is normally greater for silicon transistor than germanium transistors |
| C. | mainly depends on the emitter base junction bias |
| D. | depends largely on the emitter doping |
| Answer» B. is normally greater for silicon transistor than germanium transistors | |
| 1969. |
If Rs is the sources resistance, the O/P resistance of an emitter follower using the simplified hybrid model would be |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» B. B | |
| 1970. |
In figure, current gain is |
| A. | α |
| B. | rₑ |
| C. | RL/rₑ |
| D. | rₑ/RL |
| Answer» B. rₑ | |
| 1971. |
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 | |
| 1972. |
For the circuit in figure the output wave shape is |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» E. | |
| 1973. |
An amplifier with loop gain Aβ will be more stable for value of Aβ as |
| A. | 0.95 |
| B. | 0.7 |
| C. | 1.2 |
| D. | 1.5 |
| Answer» C. 1.2 | |
| 1974. |
If a transistor is operating with both of its Junctions forward biased, but with the collector base forward biased, but with the collector base forward bias greater than the emitter-base forward bias, then it is operating in the |
| A. | forward active mode |
| B. | reverse saturation mode |
| C. | reverse active mode |
| D. | forward saturation mode |
| Answer» D. forward saturation mode | |
| 1975. |
To draw ac equivalent circuit for a CE amplifier we should |
| A. | Reduce all dc sources to zero |
| B. | Short all capacitors |
| C. | Reduce all dc sources to zero and short all capacitors |
| D. | Reduce all dc sources to zero and open all capacitors |
| Answer» D. Reduce all dc sources to zero and open all capacitors | |
| 1976. |
A FET is a better clapper than a BJT because it has |
| A. | lower off-set voltage |
| B. | higher series ON resistance |
| C. | lower input current |
| D. | higher input impedance |
| Answer» B. higher series ON resistance | |
| 1977. |
In an amplifier, if the output current flows for 120° of the input cycle, the class of amplifier will be |
| A. | A |
| B. | B |
| C. | C |
| D. | AB |
| Answer» D. AB | |
| 1978. |
Equal amplitude ac signals are given as inputs to both inverting and given as inputs to both inverting and non-inverting terminals of an op-amp. The output will be zero when the phase difference between inputs is |
| A. | 0° |
| B. | 90° |
| C. | 180° |
| D. | 270° |
| Answer» B. 90° | |
| 1979. |
The most widely used diode rectifier circuit is |
| A. | half wave |
| B. | full wave with centre tapped transformer |
| C. | bridge |
| D. | either (a) or (b) |
| Answer» D. either (a) or (b) | |
| 1980. |
In a transistor which of the following region is very lightly doped and is very thin? |
| A. | Emitter |
| B. | Base |
| C. | Collector |
| D. | None of the above |
| Answer» C. Collector | |
| 1981. |
A push pull amplifier balance out |
| A. | odd harmonics |
| B. | even harmonics |
| C. | both odd as well as even harmonics |
| D. | neither odd nor even harmonics |
| Answer» B. even harmonics | |
| 1982. |
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 | |
| 1983. |
In the circuit of figure for sinusoidal input the waveform of the output will be as shown in |
| A. | figure A |
| B. | figure B |
| C. | figure C |
| D. | figure D |
| Answer» E. | |
| 1984. |
For input and later stages, BI-FET op-amp use |
| A. | JFETs and MOSFETs respectively |
| B. | MOSFETs and JFETs respectively |
| C. | JFETs and BJTs respectively |
| D. | BJTs and JFETs respectively |
| Answer» D. BJTs and JFETs respectively | |
| 1985. |
Oscillator with best frequency stability is |
| A. | Crystal oscillator |
| B. | Phase shift oscillator |
| C. | Clapp oscillator |
| D. | Hartley oscillator |
| Answer» B. Phase shift oscillator | |
| 1986. |
A voltage gain of a CE amplifier connected in collector to base configuration is 50. Collector to base resistor RF = 1 kΩ, RC = 4Ω, the O/P resistance R0 =? |
| A. | 800 Ω |
| B. | 813 Ω |
| C. | 817 Ω |
| D. | 819 Ω |
| Answer» C. 817 Ω | |
| 1987. |
In a P-N-P junction transistor as compared to base region is more heavily doped so that |
| A. | leakage current is minimized |
| B. | recombination will be increased in the base region |
| C. | the flow across the base regional is only because of electrons |
| D. | the flow across the base region is mainly because of holes |
| Answer» E. | |
| 1988. |
In the circuit of figure β = 100 and quiescent value of base current is 20 μA. The quiescent value of collector |
| A. | 0.2 μA |
| B. | 2 μA |
| C. | 2 mA |
| D. | 20 mA |
| Answer» D. 20 mA | |
| 1989. |
In a CE class A amplifier the quiescent current and voltage are ICQ and VCEQ. The maximum power output can be |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» C. C | |
| 1990. |
In full wave rectification, if the input frequency is 50 Hz, then frequency at the output of filter is |
| A. | 50 Hz |
| B. | 0 Hz |
| C. | 100 Hz |
| D. | 75 Hz |
| Answer» C. 100 Hz | |
| 1991. |
An engineer designs an amplifier to have a voltage gain of 60, but when constructed it only had a gain of 50. Which of the following will increases from this type of operation? |
| A. | Stability |
| B. | Bandwidth |
| C. | Distortion |
| D. | Input resistance |
| Answer» D. Input resistance | |
| 1992. |
Consider 49 cascaded amplifiers having individual rise time as 2 n sec. 3 n sec. ... 50 n sec. The input waveform rise time is 1 n sec. Then the output signal rise time is given time by (Assume output signal rise time is measured within 10 percent range of the final output signal.) |
| A. | 39 - 28 μsec |
| B. | 2.28 μsec |
| C. | 0.228 μsec |
| D. | 39.28 μsec |
| Answer» D. 39.28 μsec | |
| 1993. |
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 | |
| 1994. |
In a self bias circuit for CE amplifier the collector supply voltage is made twice. The collector current will |
| A. | decrease |
| B. | increase |
| C. | remain the same |
| D. | increase or decrease |
| Answer» C. remain the same | |
| 1995. |
In a crystal |
| A. | the frequencies of series and parallel resonance are equal |
| B. | the frequency of series resonance is more than frequency of parallel resonance |
| C. | the frequency of parallel resonance is more than frequency of series resonance |
| D. | None of the above |
| Answer» D. None of the above | |
| 1996. |
Figure shows a |
| A. | bipolar transistor |
| B. | JFET |
| C. | p-channel MOSFET |
| D. | n-channel enhancement MOSFET |
| Answer» E. | |
| 1997. |
As per miller theorem the circuit of figure (1) can be replaced by that in figure (2) If V1/V2 = K, then Y1 and Y2 are equal to |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» D. D | |
| 1998. |
The source of the harmonic distortion in a RC coupled transistor amplifier is usually |
| A. | power supply |
| B. | capacitor |
| C. | R-C circuit |
| D. | transistor |
| Answer» E. | |
| 1999. |
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 | |
| 2000. |
Figure shows a zener circuit and characteristic of the zener used. If R2 is the lowest load resistance, then for proper voltage regulation R1 must be |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» D. D | |