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.
| 1451. |
If the Q of a single stage single tuned amplifier is doubled, the bandwidth will |
| A. | remain the same |
| B. | become half |
| C. | become double |
| D. | become four times |
| Answer» C. become double | |
| 1452. |
From a measurement of the rise time of the output pulse of an amplifier whose input is a small amplitude square wave, one can estimate the following parameter of the amplifier |
| A. | gain bandwidth product |
| B. | slew rate |
| C. | upper 3 dB frequency |
| D. | lower 3 dB frequency |
| Answer» D. lower 3 dB frequency | |
| 1453. |
A second order active bandpass filter can be obtained by cascading LP second order filter having higher cut off frequency fOH with a second order HP filter having lower cut off frequency fOL provided |
| A. | fOL < fOH |
| B. | fOL > fOH |
| C. | fOH = fOL |
| D. | fOH < 0.5 fOL |
| Answer» B. fOL > fOH | |
| 1454. |
In a practical oscillator, the magnitude of loop gain Aβ is kept slightly larger than unity and the amplitude of oscillations is limited by |
| A. | the ratio of A to β |
| 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 | |
| 1455. |
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. | |
| 1456. |
Power transistors are invariably provided with |
| A. | soldered connections |
| B. | heat sink |
| C. | metallic casing |
| D. | none of the above |
| Answer» C. metallic casing | |
| 1457. |
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 | |
| 1458. |
The h parameter h11 is the same in CE and CC circuit. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» B. False | |
| 1459. |
Which power amplifier can deliver maximum load power? |
| A. | Class A |
| B. | Class AB |
| C. | Class B |
| D. | Class C |
| Answer» E. | |
| 1460. |
The semi-conductor type 2 N 34 indicates |
| A. | a n-channel MOSFET |
| B. | a JFET |
| C. | a diode with two electrodes |
| D. | a diode with three electrodes |
| Answer» D. a diode with three electrodes | |
| 1461. |
The dc load current in a bridge rectifier circuit is 10 mA. The dc load current through each diode is |
| A. | 40 mA |
| B. | 20 mA |
| C. | 10 mA |
| D. | 5 mA |
| Answer» E. | |
| 1462. |
Barkhausen criterion is 1 + Avβ = 0. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» B. False | |
| 1463. |
Consider the following statements:A totem pole configuration used in the output stage if an op-amp has the advantage of using1. Only n-p-n BJTs2. Complementary symmetrical pair of transistors3. Only one transistor Which of these statements is/are correct? |
| A. | 1 alone |
| B. | 2 alone |
| C. | 3 alone |
| D. | 1 and 3 |
| Answer» B. 2 alone | |
| 1464. |
Figure shows small signal model of CB amplifier circuit. Then I and R are respectively equal to |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» B. B | |
| 1465. |
Efficiency of class A power amplifier is very poor. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» B. False | |
| 1466. |
Astable multivibrator has |
| A. | one stable state |
| B. | two stable state |
| C. | two quasi-stable states |
| D. | one quasi stable state |
| Answer» D. one quasi stable state | |
| 1467. |
The disadvantage of FET over BJT is |
| A. | poor high frequency performance |
| B. | low power-handling ability |
| C. | low values of voltage gain |
| D. | all of the above |
| Answer» E. | |
| 1468. |
In the analysis of common emitter amplifier we may neglect |
| A. | hre |
| B. | hoe |
| C. | hfe |
| D. | hie |
| Answer» B. hoe | |
| 1469. |
An ideal op-amp has zero slew rate. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» C. May be True or False | |
| 1470. |
The main drawback in the performance of shunt peaked wide band amplifier is |
| A. | two low gain at low frequency |
| B. | poor phase response |
| C. | reduce frequency at middle frequency |
| D. | that the maximum gain of the stage is small |
| Answer» C. reduce frequency at middle frequency | |
| 1471. |
In the graphical analysis of an amplifier circuit, the slope of dc load line depends on |
| A. | load resistance only |
| B. | collector supply voltage only |
| C. | both load resistance and collector supply voltage |
| D. | none of the above |
| Answer» B. collector supply voltage only | |
| 1472. |
3N 200 is a |
| A. | semi-conductor diode |
| B. | P-N-P transistor |
| C. | dual gate MOSFET |
| D. | UJT |
| Answer» D. UJT | |
| 1473. |
For dc the current through coupling capacitor in CE amplifier circuit is |
| A. | very high |
| B. | high |
| C. | low |
| D. | zero |
| Answer» E. | |
| 1474. |
Oscillation frequency in colpitt's oscillator is |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» B. B | |
| 1475. |
The units of transistor h parameters h11 and h22 are the same. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» C. May be True or False | |
| 1476. |
Which op-amp circuit uses a capacitor in series with input and resistance in feedback path? |
| A. | Differentiating amplifier |
| B. | Integrating amplifier |
| C. | Logarithmic amplifier |
| D. | None of the above |
| Answer» B. Integrating amplifier | |
| 1477. |
According to Barkhausen criteria in order to sustain the oscillations |
| A. | loop gain of the circuit must be negligible |
| B. | loop gain of the circuit must be equal to unity |
| C. | the phase shift around the circuit must be 180° |
| D. | none of the above |
| Answer» D. none of the above | |
| 1478. |
In the op-amp circuit shown in figure the current through load resistance RL is |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» B. B | |
| 1479. |
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 | |
| 1480. |
Transformer coupling is mostly used in |
| A. | RF amplifier |
| B. | audio amplifier |
| C. | both audio and RF amplifier |
| D. | none of the above |
| Answer» D. none of the above | |
| 1481. |
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 | |
| 1482. |
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 | |
| 1483. |
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 | |
| 1484. |
If a common emitter amplifier with an emitter resistance RC has an overall transconductance gain of 1 m A/V, a voltage gain of - 4 and desensitivity of 50, then the value of the emitter resistance R would be |
| A. | 50 kΩ |
| B. | 0.98 kΩ |
| C. | 50 Ω |
| D. | 0.98 Ω |
| Answer» C. 50 Ω | |
| 1485. |
A major advantage of TWT over a Klystron lies in its |
| A. | higher bandwidth |
| B. | higher gain |
| C. | higher frequency |
| D. | higher output |
| Answer» C. higher frequency | |
| 1486. |
In a single-stage RC coupled common emitter amplifier, the phase shift at the lower 3 dB frequency is |
| A. | zero |
| B. | 135° |
| C. | 180° |
| D. | 225° |
| Answer» C. 180° | |
| 1487. |
A sine wave with slew rate distortion looks like |
| A. | step wave |
| B. | square wave |
| C. | triangular wave |
| D. | cosine wave |
| Answer» D. cosine wave | |
| 1488. |
Following figure is a signal conditioning Amplifier, changes gain depending upon the polarity of Vs. What will be circuit voltage gain for + Vs and for - Vs if D2 is ideal. |
| A. | AV = -R3/R1 |
| B. | R3/R1 |
| C. | R1/R3 |
| D. | 1 + R3/R1 |
| Answer» B. R3/R1 | |
| 1489. |
In figure the approximate voltages of |
| A. | base and emitter are - 8 V and - 7.3 V |
| B. | base and collector are - 8 V and - 5 V |
| C. | collector and emitter are - 5 V and - 7.3 V |
| D. | base, emitter and collector are - 8, - 7.3 and - 5 V |
| Answer» B. base and collector are - 8 V and - 5 V | |
| 1490. |
In a single stage differential amplifier, the output offset voltage is mainly dependent on the mismatch of |
| A. | VBE, IB and β |
| B. | VBE and IB |
| C. | IB and β |
| D. | VBE and β |
| Answer» C. IB and β | |
| 1491. |
Class-B amplifier has less efficiency compared to |
| A. | class A |
| B. | class B |
| C. | class C |
| D. | class A, AB and C |
| Answer» B. class B | |
| 1492. |
High cut off frequency can be expected in case of |
| A. | common-base |
| B. | common-emitter |
| C. | common-collector |
| D. | all of the above |
| Answer» D. all of the above | |
| 1493. |
In a CE amplifier the output coupling capacitor is short circuited. The dc collector voltage |
| A. | will increase |
| B. | may increase or decrease |
| C. | will remain the same |
| D. | will decrease |
| Answer» E. | |
| 1494. |
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 | |
| 1495. |
The D.C. alpha(α) of a transistor is approximately |
| A. | unity |
| B. | 10 to 50 |
| C. | 100 to 500 |
| D. | 1000 to 5000 |
| Answer» B. 10 to 50 | |
| 1496. |
In a CE amplifier circuit the dc voltage between emitter and ground |
| A. | is always zero |
| B. | cannot be zero |
| C. | may or may not be zero |
| D. | is negative |
| Answer» C. may or may not be zero | |
| 1497. |
Which component is allowed to pass through it by a choke filter? |
| A. | Dc |
| B. | Ac |
| C. | Both dc and ac |
| D. | Only high frequency ac |
| Answer» B. Ac | |
| 1498. |
In a CE amplifier the collector resistance is short circuited. The ac output voltage will |
| A. | increases |
| B. | remains the same |
| C. | increases or decreases |
| D. | decreases |
| Answer» E. | |
| 1499. |
Negative feedback reduces noise originating at the amplifier input. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» C. May be True or False | |
| 1500. |
For a push pull circuit the most favoured biasing method is |
| A. | self bias |
| B. | emitter bias |
| C. | diode bias |
| D. | collector bias |
| Answer» D. collector bias | |