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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.
| 1851. |
When a CE transistor is cut off |
| A. | voltage across collector reduces to zero |
| B. | voltage across collector is maximum |
| C. | maximum collector current flows |
| D. | maximum voltage appears across the load resistance |
| Answer» C. maximum collector current flows | |
| 1852. |
The bandwidth of an amplifier can be reduced by |
| A. | miller effect compensation |
| B. | pole zero compensation |
| C. | dominant pole compensation |
| D. | lead compensation |
| Answer» D. lead compensation | |
| 1853. |
How many cascaded stage of CE amplifiers will result in polarity inversion of the input signal? |
| A. | Two |
| B. | Three |
| C. | Four |
| D. | None |
| Answer» C. Four | |
| 1854. |
Circuit shown in the figure is |
| A. | astable multivibrator |
| B. | monostable multivibrator |
| C. | VCO |
| D. | ramp Generator |
| Answer» B. monostable multivibrator | |
| 1855. |
In a transistor, current ICBO flow when |
| A. | some D.C. voltage is applied in the reverse direction to the emitter junction with the collector open circuit |
| B. | some D.C. voltage is applied in the forward direction to the collector junction with the emitter open circuit |
| C. | some D.C. voltage is applied in the reverse direction to the collector junction with the emitter open circuited |
| D. | some D.C. voltage is applied in the forward direction to the emitter junction with the collector open circuited |
| Answer» D. some D.C. voltage is applied in the forward direction to the emitter junction with the collector open circuited | |
| 1856. |
The D.C. alpha(a) of a transistor is approximately |
| A. | unity |
| B. | 10 to 50 |
| C. | 100 to 500 |
| D. | 1000 to 5000 |
| Answer» B. 10 to 50 | |
| 1857. |
When negative feedback is used the fractional changes in closed loop gain are desensitized by the factor (1 + Av ) |
| A. | True |
| B. | False |
| Answer» B. False | |
| 1858. |
Which of the following is the common feature between FETs and bipolars? |
| A. | Have low input impedance |
| B. | Have low voltage gain |
| C. | Are difficult to bias |
| D. | None of them |
| Answer» E. | |
| 1859. |
In figure the diode is ideal (zero cut in voltage zero forward resistance). Then the current through diode is |
| A. | 0 |
| B. | 4 A |
| C. | 1 A |
| D. | none of the above |
| Answer» D. none of the above | |
| 1860. |
The circuit shown in the figure is that of |
| A. | non-inverting amplifier |
| B. | Inverting amplifier |
| C. | an oscillator |
| D. | Schmitt trigger |
| Answer» E. | |
| 1861. |
The current through common emitter resistor of a differential amplifier is called |
| A. | differential current |
| B. | emitter current |
| C. | ground current |
| D. | tail current |
| Answer» E. | |
| 1862. |
The theoretical maximum efficiency of a half wave diode rectifier is |
| A. | 40.6% |
| B. | 50% |
| C. | 81.2% |
| D. | slightly less than 100% |
| Answer» B. 50% | |
| 1863. |
2N 2430 could be a |
| A. | semi-conductor diode |
| B. | dual gate MOSFET |
| C. | BJT |
| D. | UJT |
| Answer» D. UJT | |
| 1864. |
In a transistor push pull amplifier |
| A. | there is no dc present in the output |
| B. | there are no even harmonics in the output |
| C. | both (a) and (b) |
| D. | neither (a) nor (b) |
| Answer» D. neither (a) nor (b) | |
| 1865. |
The circuit shown I/P in the figure represents |
| A. | Low pass filter |
| B. | High pass filter |
| C. | Band Pass filter |
| D. | Band stop filter |
| Answer» D. Band stop filter | |
| 1866. |
In figure the trace on the CRO will be |
| A. | half rectifier wave |
| B. | clamped wave |
| C. | no trace at all |
| D. | either (a) or (b) |
| Answer» C. no trace at all | |
| 1867. |
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 | |
| 1868. |
In the op-amp circuit shown in figure the current through load resistance RL is |
| A. | <img src="/_files/images/electronics-and-communication-engineering/analog-electronics/317-222-2.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/analog-electronics/317-222-3.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/analog-electronics/317-222-4.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/analog-electronics/317-222-5.png"> |
| Answer» B. <img src="/_files/images/electronics-and-communication-engineering/analog-electronics/317-222-3.png"> | |
| 1869. |
Whenever a JFET operates above pinch-off voltage |
| A. | depletion regions become smaller |
| B. | drain current increase steeply |
| C. | drain current starts decreasing |
| D. | drain current remains nearly constant |
| Answer» E. | |
| 1870. |
A Weinbridge oscillator is a |
| A. | VHF oscillator |
| B. | RF oscillator |
| C. | microwave oscillator |
| D. | audio frequency oscillator |
| Answer» E. | |
| 1871. |
RC network shown in the given figure can provide a maximum theoretical phase shift of |
| A. | 90 |
| B. | 180 |
| C. | 270 |
| D. | 360 |
| Answer» C. 270 | |
| 1872. |
Assertion (A): In the circuit shown figure the diode is used to protect the active devices. Transistor T goes into saturation when a positive pulse is applied at base and non conductingReason (R): When the current in an inductor is suddenly stopped, a high voltage is induced across it. |
| 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 | |
| 1873. |
For full wave rectification four diode bridge rectifier is claimed to have following advantages: Less expensive transformerSmall size transformerSuitable for higher voltage applications Which of these are correct? |
| A. | 1 and 2 only |
| B. | 1 and 3 only |
| C. | 2 and 2 only |
| D. | 1, 2, 3 |
| Answer» E. | |
| 1874. |
In a full wave diode rectifier circuit each diode carries current for |
| A. | 90 in each cycle |
| B. | 180 in each cycle |
| C. | 270 in each cycle |
| D. | 360 in each cycle |
| Answer» C. 270 in each cycle | |
| 1875. |
When a JFET is cut off, it's like an __________ switch and when it is saturated, it's like a __________ switch. |
| A. | closed, open |
| B. | open, closed |
| C. | open, open |
| D. | closed, closed |
| Answer» C. open, open | |
| 1876. |
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 | |
| 1877. |
The given circuit has a feedback factor of |
| A. | <img src="/_files/images/electronics-and-communication-engineering/analog-electronics/339-615-2.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/analog-electronics/339-615-3.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/analog-electronics/339-615-4.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/analog-electronics/339-615-5.png"> |
| Answer» E. | |
| 1878. |
Assertion (A): Linear ICs include audio amplifier, wideband amplifier, RF amplifier and IF amplifierReason (R): The error voltage in a feedback circuit is very small |
| 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 | |
| 1879. |
For a transistor if adc = 0.98 and emitter current IE is 2 mA, then base current will be |
| A. | 10 A |
| B. | 40 A |
| C. | 80 A |
| D. | 200 A |
| Answer» B. 40 A | |
| 1880. |
Assertion (A): The horizontal intercept of dc load line is the same as ideal cut off pointReason (R): When a transistor is in cut off region, collector current is zero |
| 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 | |
| 1881. |
Which circuit is called swamped amplifier? |
| A. | CC |
| B. | CE |
| C. | CB |
| D. | Both (a) and (b) |
| Answer» B. CE | |
| 1882. |
In a linear op-amp circuit |
| A. | the product of gain and bandwidth is constant |
| B. | input can be dc only |
| C. | input can be ac only |
| D. | saturation may occur |
| Answer» B. input can be dc only | |
| 1883. |
In a normally biased N-P-N transistor the main current crossing the collector junction is |
| A. | a drift current |
| B. | a hole current |
| C. | a diffusion current |
| D. | same as the base current |
| Answer» B. a hole current | |
| 1884. |
The input gate current of a FET is |
| A. | a few amperes |
| B. | a few milli amperes |
| C. | a few micro amperes |
| D. | negligible |
| Answer» E. | |
| 1885. |
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 | |
| 1886. |
For maximum unclipped output from a CE amplifier, the Q point should be |
| A. | at the centre of dc load line |
| B. | at the centre of ac load line |
| C. | at the centre of collector current |
| D. | none of the above |
| Answer» C. at the centre of collector current | |
| 1887. |
The circuit shown in figure will act as |
| A. | differentiator |
| B. | adder |
| C. | clipper |
| D. | clamper |
| Answer» D. clamper | |
| 1888. |
If three cascaded stages of amplifier have gains 10, 20 and 30 the overall voltage will be |
| A. | 30 |
| B. | 60 |
| C. | 600 |
| D. | 6000 |
| Answer» E. | |
| 1889. |
A collector collects |
| A. | electrons from the base in case of N-P-N transistor |
| B. | electrons from the emitter in case P-N-P transistor |
| C. | holes from the base in case of N-P-N transistor |
| D. | holes from the base in case of P-N-P transistor |
| Answer» C. holes from the base in case of N-P-N transistor | |
| 1890. |
Which of the following best represents the input impedance of an actual op-amp? |
| A. | 10 ohm |
| B. | 1 k ohm |
| C. | 1 M ohm |
| D. | 100 M ohm |
| Answer» D. 100 M ohm | |
| 1891. |
The input resistance of FET in the low frequency small signal operation is |
| A. | infinitely high |
| B. | around 1 kΩ |
| C. | around 50 Ω |
| D. | very small |
| Answer» B. around 1 kΩ | |
| 1892. |
A logarithmic amplifier has diode in the feedback path. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 1893. |
Which configuration has high input impedance and low output impedance? |
| A. | CB |
| B. | CE |
| C. | CC |
| D. | CB and CE |
| Answer» D. CB and CE | |
| 1894. |
Assertion (A): An ac amplifier uses coupling capacitors at input and outputReason (R): The capacitive reactance varies inversely with frequency. It is infinite for dc |
| 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 | |
| 1895. |
Common base configuration is little used because |
| A. | it has low input impedance |
| B. | it has high input impedance |
| C. | it does not heat up |
| D. | it has very high gain |
| Answer» B. it has high input impedance | |
| 1896. |
If the plate supply voltage for a plate modulated class C amplifier is E volts, the maximum plate-cathode voltage could be almost as high as |
| A. | E |
| B. | E/2 |
| C. | 2E |
| D. | 4E |
| Answer» E. | |
| 1897. |
In a JFET, the lower end is called the __________ and the upper end is called the __________ . |
| A. | source, channel |
| B. | channel, drain |
| C. | source, drain |
| D. | drain source |
| Answer» D. drain source | |
| 1898. |
The changes in ambient temperature affect the open loop gain of amplifier. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 1899. |
A semi-conductor device that behaves like two SCRs is |
| A. | UJT |
| B. | MOSFET |
| C. | JFET |
| D. | TRIAC |
| Answer» E. | |
| 1900. |
As compared to a BJT amplifier circuit, a JFET amplifier circuit |
| A. | has low input impedance |
| B. | has high input impedance |
| C. | has very low input impedance |
| D. | may have either low or high input impedance |
| Answer» C. has very low input impedance | |