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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.
| 1301. |
A Darlington pair is used for |
| A. | low distortion |
| B. | high frequency range |
| C. | high power gain |
| D. | high current gain |
| Answer» E. | |
| 1302. |
In voltage amplifiers, the load resistance |
| A. | should be a small as possible |
| B. | should be as large as possible |
| C. | must be equal to output impedance |
| D. | must be half of output impedance |
| Answer» C. must be equal to output impedance | |
| 1303. |
The common-drain amplifier, better known as the source follower, has a voltage gain __________ and the output signal is __________ with the input signal. |
| A. | approaching unity, in phase |
| B. | approaching unity, out of phase |
| C. | is very high, in phase |
| D. | is very high, in reverse phase |
| Answer» B. approaching unity, out of phase | |
| 1304. |
Assertion (A): The gain of an FET amplifier can be changed by changing gmReason (R): Most receivers use automatic gain control to counteract changes in volume caused by fading |
| 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 | |
| 1305. |
In figure we need an ac ground. The proper value of C is |
| A. | 1000 μF |
| B. | 100 μF |
| C. | 10 μF |
| D. | 1 μF |
| Answer» B. 100 μF | |
| 1306. |
For a transistor amplifier with self biasing network, the following components are used. R1 = 4 kΩ, R2 = 4 kΩ, RC = 1 kΩ. The approximate value of the stability factor 'S' will be |
| A. | 4 |
| B. | 3 |
| C. | 2 |
| D. | 1.5 |
| Answer» C. 2 | |
| 1307. |
In a Hartley oscillator the condition for sustained oscillations is hfe = L₁/L₂ . If there exists mutual inductance M between coils L₁ and L₂, then the above condition will get modified as hfe |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» D. D | |
| 1308. |
In a CC circuit the current gain is |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» B. B | |
| 1309. |
Figure shows current pulses of a class C power amplifier. The fundamental frequency of these pulses is |
| A. | 100 kHz |
| B. | 1000 kHz |
| C. | 10 kHz |
| D. | 1 kHz |
| Answer» B. 1000 kHz | |
| 1310. |
Which of the following statement about JFET is true? |
| A. | In a JFET, gate and source have opposite polarity with respect to drain irrespective of the type of FET |
| B. | In its schematic symbol for JFET, the arrow always points to p-type material |
| C. | In an n-channel JFET, the channel is the narrowest under zero gate bias condition |
| D. | In JFET, gate source cut off voltage is numerically equal to the pinch off voltage |
| Answer» E. | |
| 1311. |
The input differential stage of op-amp. 741 is baised at about 10 μA current such a low current of the input stage gives 1. high CMRR2. high differential gain3. low differential4. high input impedance Which of these are correct? |
| A. | 1 and 2 |
| B. | 1, 2 and 4 |
| C. | 3 and 4 |
| D. | 1, 2, 3 and 4 |
| Answer» C. 3 and 4 | |
| 1312. |
In a commercially available good power supply the voltage regulation is about |
| A. | 1% |
| B. | 5% |
| C. | 10% |
| D. | 20% |
| Answer» B. 5% | |
| 1313. |
In rectifiers the use of RC filters is recommended when |
| A. | load current is high |
| B. | load current is small |
| C. | load current is neither high nor small |
| D. | either (a) or (c) |
| Answer» C. load current is neither high nor small | |
| 1314. |
The advantage of FET over BJT is |
| A. | high input impedance |
| B. | lower noise |
| C. | no thermal runaway |
| D. | all of the above |
| Answer» E. | |
| 1315. |
A TRIAC is a semiconductor device which acts as a |
| A. | 2 terminal unidirectional switch |
| B. | 2 terminal bidirectional switch |
| C. | 3 terminal bidirectional switch |
| D. | 4 terminal multidirectional switch |
| Answer» D. 4 terminal multidirectional switch | |
| 1316. |
2N 2430 could be a |
| A. | semi-conductor diode |
| B. | dual gate MOSFET |
| C. | BJT |
| D. | UJT |
| Answer» D. UJT | |
| 1317. |
For Q >> 1, the output frequency of LC oscillator is equal to resonant frequency. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» B. False | |
| 1318. |
A Weinbridge oscillator is a |
| A. | VHF oscillator |
| B. | RF oscillator |
| C. | microwave oscillator |
| D. | audio frequency oscillator |
| Answer» E. | |
| 1319. |
The circuit of figure is called |
| A. | current mirror |
| B. | voltage mirror |
| C. | impedance inversion |
| D. | phase splitting |
| Answer» B. voltage mirror | |
| 1320. |
For high frequencies a capacitor like |
| A. | an open circuit |
| B. | a short circuit |
| C. | either open circuit or short circuit |
| D. | none of the above |
| Answer» C. either open circuit or short circuit | |
| 1321. |
Assertion (A): Manufacturer's quote h parameters of transistor Reason (R): h parameters of a transistor are easiest to measure |
| 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 | |
| 1322. |
In a class C power amplifier the input frequency of ac signal is 1 MHz. If tank circuit has C = 1000 pF, the value of L = |
| A. | 25 μH |
| B. | 50 μH |
| C. | 100 μH |
| D. | 200 μH |
| Answer» B. 50 μH | |
| 1323. |
Quartz crystal has |
| A. | very small Q |
| B. | small Q |
| C. | very high Q |
| D. | Q less than 1 |
| Answer» D. Q less than 1 | |
| 1324. |
Which of the following statement about TRIAC is incorrect? |
| A. | It is not particularly suited to A.C. or mains power control |
| B. | Any one of its main terminals can be used either as cathode or as anode |
| C. | It can be triggered in response to both positive and negative gate terminals |
| D. | None of the above |
| Answer» B. Any one of its main terminals can be used either as cathode or as anode | |
| 1325. |
A transistor has a maximum power dissipation of 350 mW at an ambient temperature of 25°C. If derating factor is 2 mW/°C, the maximum power dissipation for 40°C ambient temperature is |
| A. | 300 mW |
| B. | 330 mW |
| C. | 350 mW |
| D. | 380 mW |
| Answer» D. 380 mW | |
| 1326. |
A multistage amplifier has a low pass response with three real poles at s = - w1 - w2 and w3. The approximate overall bandwidth B of the amplifier will be given by |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» B. B | |
| 1327. |
The Darlington pair consists of the following two stages |
| A. | CE and CC |
| B. | both CE |
| C. | both CC |
| D. | CE and CB |
| Answer» D. CE and CB | |
| 1328. |
The input to negative clamper has a peak value of Vp. Then in the output the positive and negative peaks are nearly |
| A. | 0 and -2 V respectively |
| B. | Vp and -Vp respectively |
| C. | 2 Vp and 0 respectively |
| D. | none of the above |
| Answer» B. Vp and -Vp respectively | |
| 1329. |
The gate electrode in the FET corresponds to the |
| A. | collector in a bipolar transistor |
| B. | base in a bipolar transistor |
| C. | emitter in a bipolar transistor |
| D. | none of the above |
| Answer» C. emitter in a bipolar transistor | |
| 1330. |
A 12 kHz pulse wave-form is amplified by a circuit having an Upper cut-off frequency of 1 MHz. The minimum input pulse width that can be accurately reproduced is |
| A. | 83.33 μ sec |
| B. | 1 μ sec |
| C. | 0.1 m sec |
| D. | 3.5 m sec |
| Answer» C. 0.1 m sec | |
| 1331. |
A virtual ground is a ground for |
| A. | voltage |
| B. | current |
| C. | both voltage and current |
| D. | voltage but not for current |
| Answer» E. | |
| 1332. |
The MOSFET is almost ideal as a switching device because |
| A. | it has linear characteristics |
| B. | it works progressively |
| C. | it consumes low power |
| D. | it has longer life |
| Answer» D. it has longer life | |
| 1333. |
In a N-P-N transistor of the emitter junction is reverse biased and collector junction is also reversed biased, the transistor will operate in |
| A. | active region |
| B. | saturation region |
| C. | cut-off region |
| D. | inverted region |
| Answer» D. inverted region | |
| 1334. |
In a full wave voltage doubler circuit, the input frequency is 560 Hz. The ripple frequency is |
| A. | 25 Hz |
| B. | 50 Hz |
| C. | 100 Hz |
| D. | 200 Hz |
| Answer» D. 200 Hz | |
| 1335. |
For an op-amp source follower circuit |
| A. | input and output voltages have same magnitude |
| B. | output and input voltages are in phase |
| C. | output and input voltages are in phase but have different magnitudes |
| D. | output and input voltages have same magnitude and are in phase |
| Answer» D. output and input voltages have same magnitude and are in phase | |
| 1336. |
The h parameter equivalent circuit of BJT has one voltage source and one current source. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» B. False | |
| 1337. |
The voltage eo indicated in the figure has been measured by an ideal voltmeter. Which of the following can be calculated? |
| A. | Bias current of inverting input only |
| B. | Bias current of inverting and non-inverting inputs only |
| C. | Input offset current only |
| D. | Both the bias currents and the I/P offset current |
| Answer» D. Both the bias currents and the I/P offset current | |
| 1338. |
One of the major applications of JFET is in |
| A. | switching |
| B. | constant current-source |
| C. | constant voltage-source |
| D. | electron flow regulation |
| Answer» B. constant current-source | |
| 1339. |
In a voltage regulator circuit using zener diode the load voltage is nearly constant only if |
| A. | zener current is very small |
| B. | zener current is very large |
| C. | zener current is neither small nor large |
| D. | None of the above |
| Answer» B. zener current is very large | |
| 1340. |
In class C operation of an amplifier circuit, the collector current exists for |
| A. | 360° of input wave |
| B. | 180° of input wave |
| C. | more than 180° of input wave |
| D. | less than 180° of input wave |
| Answer» E. | |
| 1341. |
The value of parameter re used in re transistor model |
| A. | increases with increase in temperature |
| B. | decreases with increase in temperature |
| C. | is not affected by increase in temperature |
| D. | either (b) or (c) |
| Answer» B. decreases with increase in temperature | |
| 1342. |
An ideal power supply has |
| A. | zero internal resistance |
| B. | very high internal resistance |
| C. | high output resistance |
| D. | both (b) and (c) |
| Answer» B. very high internal resistance | |
| 1343. |
Which of the following are synonymous? |
| A. | MOSFET and IGEFT |
| B. | FET and JFET |
| C. | JFET and MOSFET |
| D. | P-N-P and N-P-N |
| Answer» B. FET and JFET | |
| 1344. |
If an amplifier with gain of - 100 and feedback of β = - 0.1 has a gain change of 20% due to temperature the change in gain of the feedback amplifier will be |
| A. | 0.02% |
| B. | 2% |
| C. | 0.1% |
| D. | 0.01% |
| Answer» C. 0.1% | |
| 1345. |
The element in the feedback circuit of a logarithmic amplifier using op-amp is |
| A. | a resistor |
| B. | a capacitor |
| C. | an inductor |
| D. | a diode |
| Answer» E. | |
| 1346. |
A class C amplifier has input frequency of 200 kHz. If width of collector pulses is 0.1 μs, duty cycle is |
| A. | 1% |
| B. | 2% |
| C. | 10% |
| D. | 20% |
| Answer» C. 10% | |
| 1347. |
The circuit diagram shown in the figure consists of transistors in |
| A. | parallel connection |
| B. | cascade connection |
| C. | darlington connection |
| D. | series connection |
| Answer» B. cascade connection | |
| 1348. |
The input and output signals for CE amplifier are always |
| A. | equal |
| B. | in phase |
| C. | out of phase |
| D. | complementary to each other |
| Answer» D. complementary to each other | |
| 1349. |
An op-amp has zero gain for common mode inputs. Then CMRR = |
| A. | zero |
| B. | infinite |
| C. | high |
| D. | low |
| Answer» C. high | |
| 1350. |
Which circuit is called emitter follower? |
| A. | CC |
| B. | CE |
| C. | CB |
| D. | Both (a) and (b) |
| Answer» B. CE | |