MCQOPTIONS
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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.
| 1601. |
Class C amplifier is suitable for |
| A. | a narrow frequency band |
| B. | a wide frequency band |
| C. | audio frequencies |
| D. | either (b) or (c) |
| Answer» B. a wide frequency band | |
| 1602. |
A sine wave is passed through an amplifier which severely limits it symmetrically. If then passes to a second amplifier which is narrow band and tuned to the frequency of the original sine wave. What will be the output wave from this second amplifier? |
| A. | A square wave of the same frequency as that of the original sine wave |
| B. | A square wave of double the frequency of that of original sine wave |
| C. | A sine wave of constant amplitude at the frequency of the original sine wave |
| D. | A sine wave of constant amplitude at double frequency of the original sine wave |
| Answer» D. A sine wave of constant amplitude at double frequency of the original sine wave | |
| 1603. |
In an amplifier if conductor during the cycle is from 0 to 90° and again from 180° to 270°, the amplifier will be termed as |
| A. | class A |
| B. | class B |
| C. | class C |
| D. | class AB |
| Answer» C. class C | |
| 1604. |
The transconductance curve of a JFET is |
| A. | a straight line |
| B. | parabolic |
| C. | hyperbolic |
| D. | inverted V-type |
| Answer» C. hyperbolic | |
| 1605. |
In deriving ac equivalent circuit for an amplifier circuit we short circuit |
| A. | all resistors |
| B. | all transistors |
| C. | all inductors |
| D. | all capacitors |
| Answer» E. | |
| 1606. |
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. | |
| 1607. |
For transistor 2 N 338 the manufacturer specifies Pmax = 100 mW at 250°C free air temperature and maximum junction temperature of 125°C. Its thermal resistance is |
| A. | 10° C/W |
| B. | 100° C/W |
| C. | 1000° C/W |
| D. | 5000° C/W |
| Answer» D. 5000° C/W | |
| 1608. |
Which one of the following is connect expression of id for figure? |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» B. B | |
| 1609. |
In a CE amplifier the Q point is very close to cutoff point on the load line. This results in |
| A. | saturation clipping |
| B. | cut off clipping |
| C. | both saturation and cut off clipping |
| D. | either saturation clipping or cut off clipping |
| Answer» C. both saturation and cut off clipping | |
| 1610. |
In a CE amplifier |
| A. | both ac and dc load lines have the same slope |
| B. | the ac load line has more slope than dc load line |
| C. | the ac load line has less slope than dc load line |
| D. | the two load lines may have slope more than the other |
| Answer» C. the ac load line has less slope than dc load line | |
| 1611. |
Which of the following are difficult to be fabricated in a monolithic IC? |
| A. | Inductors |
| B. | Large capacitors |
| C. | Small capacitors |
| D. | Both (a) and (b) |
| Answer» E. | |
| 1612. |
A Hartley oscillator is used for generation |
| A. | very low frequency oscillation |
| B. | radio frequency oscillation |
| C. | microwave oscillation |
| D. | audio-frequency oscillation |
| Answer» E. | |
| 1613. |
In a half wave diode rectifier circuit the current flows in the load circuit 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 | |
| 1614. |
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. | |
| 1615. |
Which of the following op-amp circuits has zero resistance in the feedback path? |
| A. | Inverting amplifier |
| B. | Summing amplifier |
| C. | Source follower |
| D. | Integrating amplifier |
| Answer» D. Integrating amplifier | |
| 1616. |
One of the following can be used to generate a pulse whenever triggered |
| A. | flip-flop |
| B. | monostable multivibrator |
| C. | stable multivibrator |
| D. | Schmitt trigger |
| Answer» C. stable multivibrator | |
| 1617. |
The disadvantage of direct coupled amplifiers is |
| A. | drift |
| B. | large size of transistor |
| C. | low voltage gain |
| D. | both (b) and (c) |
| Answer» B. large size of transistor | |
| 1618. |
In feedback amplifier the closed loop gain is nearly independent of open loop gain and depends only on the feedback factor. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» B. False | |
| 1619. |
Which of the following is not valid in case of FETs? |
| A. | It has low voltage gain |
| B. | It has high input impedance |
| C. | It has fast switching time |
| D. | It is voltage controlled device |
| Answer» D. It is voltage controlled device | |
| 1620. |
The main advantage of CC amplifier is |
| A. | High input impedance and low output impedance |
| B. | Low input impedance and high output impedance |
| C. | High voltage gain |
| D. | High current gain |
| Answer» B. Low input impedance and high output impedance | |
| 1621. |
The ideal characteristics of a stabilizer is |
| A. | constant output voltage with low internal resistance |
| B. | constant output current with low internal resistance |
| C. | constant output voltage with high internal resistance |
| D. | constant internal resistance and constant output current |
| Answer» B. constant output current with low internal resistance | |
| 1622. |
The voltage gains of an amplifier without feedback and with negative feedback respectively are 100 and 20. The percentage of negative feedback would be. |
| A. | 40% |
| B. | 5% |
| C. | 20% |
| D. | 80% |
| Answer» D. 80% | |
| 1623. |
In saturation region JFET acts like a |
| A. | bipolar device |
| B. | short circuit |
| C. | switch |
| D. | resistance |
| Answer» E. | |
| 1624. |
A Clapp's oscillator is |
| A. | a modified Hartley oscillator |
| B. | a modified Colpitt's oscillator |
| C. | a modified RC oscillator |
| D. | none of the above |
| Answer» C. a modified RC oscillator | |
| 1625. |
In a push pull circuit the two transistors are |
| A. | both pnp |
| B. | both npn |
| C. | one pnp and other npn |
| D. | either (a) or (b) |
| Answer» D. either (a) or (b) | |
| 1626. |
A transistor has 1. collector2. emitter3. base 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. | |
| 1627. |
Which of the following device acts as an N-P-N and a P-N-P transistor connected base to base and emitter to controller? |
| A. | UJT |
| B. | SCR |
| C. | Diac |
| D. | Triac |
| Answer» C. Diac | |
| 1628. |
A forward voltage of 9 V is applied to a diode in series with a 1 kΩ load resistor. The voltage across load resistor is zero. It indicates that |
| A. | diode is short circuited |
| B. | diode is open circuited |
| C. | resistor is open circuited |
| D. | diode is either short circuited or open circuited |
| Answer» C. resistor is open circuited | |
| 1629. |
Which amplifier has a voltage gain of less than 1? |
| A. | Common emitter |
| B. | Common collector |
| C. | Common base |
| D. | Both CB and CC |
| Answer» C. Common base | |
| 1630. |
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 | |
| 1631. |
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 | |
| 1632. |
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 | |
| 1633. |
Assertion (A): The duty cycle of a class C amplifier affects the power dissipation of transistorReason (R): At higher harmonics the efficiency of a class C amplifier becomes poor |
| 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 | |
| 1634. |
A negative feedback can be of |
| A. | 2 types |
| B. | 3 types |
| C. | 4 types |
| D. | only 1 type |
| Answer» D. only 1 type | |
| 1635. |
An op-amp is fed from a signal source through resistance R1. If it is to work as sign changer, the feedback resistance Rf should be |
| A. | equal to R1 |
| B. | twice R1 |
| C. | half R1 |
| D. | either (b) or (c) |
| Answer» B. twice R1 | |
| 1636. |
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 | |
| 1637. |
In a CE amplifier the ac signal is increased. Which of the following will not change? |
| A. | Ac base voltage |
| B. | Ac collector voltage |
| C. | Ac emitter voltage |
| D. | Ac collector voltage and ac emitter voltage |
| Answer» D. Ac collector voltage and ac emitter voltage | |
| 1638. |
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 Ω | |
| 1639. |
In which configuration is ac collector voltage zero? |
| A. | CE |
| B. | CB |
| C. | CC |
| D. | none of the above |
| Answer» D. none of the above | |
| 1640. |
Saturation region of a JFET is also known as |
| A. | source region |
| B. | analog region |
| C. | pinch off region |
| D. | ohmic region |
| Answer» E. | |
| 1641. |
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 | |
| 1642. |
If f is more than funity the gain of op-amp becomes less than 1. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» B. False | |
| 1643. |
The oscillator shown in figure is a |
| A. | Colpitt's oscillator |
| B. | Hartley oscillator |
| C. | Tuned emitter oscillator |
| D. | Clapp oscillator |
| Answer» B. Hartley oscillator | |
| 1644. |
By connecting external resistances to a differential amplifier we can adjust |
| A. | voltage gain |
| B. | bandwidth |
| C. | both voltage gain and bandwidth |
| D. | none of the above |
| Answer» D. none of the above | |
| 1645. |
Assertion (A): A large negative feedback is deliberately introduced in an amplifier to make its gain independent of variation is in parameters of active device and other components.Reason (R): A large negative feedback results in a high value of return difference compared to unity which makes the feedback gain inversely proportional to feedback factor. |
| 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 | |
| 1646. |
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 | |
| 1647. |
In figure the voltage gain is |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» D. D | |
| 1648. |
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 | |
| 1649. |
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 | |
| 1650. |
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 | |