MCQOPTIONS
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MCQOPTIONS
This section includes 503 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.
| 351. |
Consider the following statements regarding phase sensitive detector 1. The detector reads zero when phases of input signal and reference signal are different.2. The detector acts as a linear rectifier.3. The detector can be used as vector voltmeter. Of the above statements which are correct? |
| A. | 1, 2, 3 |
| B. | 1 and 2 |
| C. | 2 and 3 |
| D. | 1 and 3 |
| Answer» D. 1 and 3 | |
| 352. |
If temperature increases by about 50°, the resistance of thermistor changes to |
| A. | half of its initial value |
| B. | twice of its initial value |
| C. | eight times of its initial value |
| D. | one eight of its initial value |
| Answer» E. | |
| 353. |
Which of these instruments is dynamometers type? |
| A. | Wattmeter |
| B. | Power factor meter |
| C. | Frequency meter |
| D. | Both (a) and (b) |
| Answer» E. | |
| 354. |
The electrical power to a megger is provided by |
| A. | battery |
| B. | inverter |
| C. | permanent magnet dc generator |
| D. | ac generator |
| Answer» D. ac generator | |
| 355. |
The scale of moving iron instrument is linear. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» C. May be True or False | |
| 356. |
A permanent magnet moving coil measures |
| A. | true rms value |
| B. | dc value |
| C. | peak value |
| D. | rms plus dc value |
| Answer» C. peak value | |
| 357. |
Which instrument needs creep compensation? |
| A. | Dynamometer wattmeter |
| B. | Induction wattmeter |
| C. | Energy meter |
| D. | Both (b) and (c) |
| Answer» D. Both (b) and (c) | |
| 358. |
Magnetic deflection sensitivity is defined as |
| A. | deflection/flux density |
| B. | (deflection/flux density)^0.5 |
| C. | (Deflection)^0.5/flux density |
| D. | none of the above |
| Answer» B. (deflection/flux density)^0.5 | |
| 359. |
A resistance strain gauge is usually |
| A. | wire grid type |
| B. | foil type |
| C. | any of these |
| D. | none of these |
| Answer» D. none of these | |
| 360. |
Which of the following is true about an impulse voltage? |
| A. | It is a unidirectional voltage |
| B. | Chopped impulse flashover does not occur |
| C. | Time taken to rise is equal to time taken to fall |
| D. | RMS value is always less than 50% of average value |
| Answer» B. Chopped impulse flashover does not occur | |
| 361. |
A Maxwell's bridge has the unknown inductance in one arm and resistance in the other three arms. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» C. May be True or False | |
| 362. |
The accuracy of measurement using CRO is about |
| A. | ± 0.5% |
| B. | ± 0.05 % |
| C. | ± 1% |
| D. | ± 3% |
| Answer» E. | |
| 363. |
Electrostatic voltmeter is suitable only for low voltages. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» C. May be True or False | |
| 364. |
A moving coil meter has a resistance of 50 ohms and a full scale deflection current of 20 mA. To convert it into a voltmeter of 0-100 V range, the series resistance should be |
| A. | 5000 Ω |
| B. | 5050 Ω |
| C. | 4950 Ω |
| D. | 505 Ω |
| Answer» D. 505 Ω | |
| 365. |
As per BIS there are 6 accuracy classes of instruments. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» C. May be True or False | |
| 366. |
The response of D'Arsonval galvanometer is over damped if |
| A. | D² > 4CJ |
| B. | D² > 2CJ |
| C. | D² < 4CJ |
| D. | D² < 2CJ |
| Answer» B. D² > 2CJ | |
| 367. |
It is required to measure pressure using LVDT. The additional device needed is |
| A. | strain gauge |
| B. | pitot tube |
| C. | bourden tube |
| D. | rotameter |
| Answer» D. rotameter | |
| 368. |
Measuring of unknown voltage with a dc potentiometer loses its advantage of open circuit measurement when |
| A. | primary circuit battery is changed |
| B. | standardisation is done to compensate for drift |
| C. | voltage is larger than range of potentiometer |
| D. | range reduction by factor of 10 is employed |
| Answer» E. | |
| 369. |
In figure, the position of voltmeter and ammeter are exchanged. It may result in damage to |
| A. | both the instruments |
| B. | ammeter |
| C. | voltmeter |
| D. | neither of two |
| Answer» C. voltmeter | |
| 370. |
In the wheatstone bridge in figure, each resistance is increased by 0.05%. The value of v0 will be |
| A. | 50 mV |
| B. | 5 mV |
| C. | 0.1 mV |
| D. | zero |
| Answer» E. | |
| 371. |
The dimensions of EMF are |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» B. B | |
| 372. |
In the balanced bridge shown in figure. X should be |
| A. | a self inductance having resistance |
| B. | a capacitance |
| C. | a non-inductive resistance |
| D. | an inductance and capacitance in parallel |
| Answer» B. a capacitance | |
| 373. |
An oscilloscope has an input impedance consisting of 1 MΩ and 20 pF is parallel. A high impedance probe connected to input of this oscilloscope has a 10 MΩ series resistance. This 10 MΩ series resistance |
| A. | may not be shunted |
| B. | should be shunted by 2 pF capacitor |
| C. | should be shunted by 20 pF capacitor |
| D. | should be shunted by 200 pF capacitor |
| Answer» C. should be shunted by 20 pF capacitor | |
| 374. |
Which of the following is used as detector in audio frequency ac bridges? |
| A. | AC voltmeter |
| B. | CRO |
| C. | Head phones |
| D. | Vibration galvanometer |
| Answer» D. Vibration galvanometer | |
| 375. |
It is required to measure angular position. Out of the transducers1.Circular potentiometer2. LVDT3. E pick up4. Synchro The proper devices are |
| A. | 1, 2, 3, 4 |
| B. | 2 and 3 |
| C. | 1, 2, 4 |
| D. | 1 and 4 |
| Answer» E. | |
| 376. |
An ammeter of 0-25 A range has a guaranteed accuracy of 1% of full scale reading. The current measured is 5 A. The limiting error is |
| A. | 2% |
| B. | 2.5% |
| C. | 4% |
| D. | 5% |
| Answer» E. | |
| 377. |
The coil of a moving iron instrument has a resistance of 500 Ω and an inductance of 1 H. It reads 250 V when a 250 V dc is applied. If series resistance is 2000 Ω, its reading when fed by 250 V, 50 Hz ac will be |
| A. | 260 V |
| B. | 252 V |
| C. | 250 V |
| D. | 248 V |
| Answer» E. | |
| 378. |
The household energy meter is |
| A. | indicating instrument |
| B. | recording instrument |
| C. | integrating instrument |
| D. | none of the above |
| Answer» D. none of the above | |
| 379. |
A standard cell of 1.0185 V is used with a slide wire potentiometer. The balance was obtained at 60 cm. When an unknown emf was connected, the balance was obtained at 82 cm. The magnitude of unknown emf is |
| A. | 1.39 V |
| B. | 0.75 V |
| C. | 13.9 V |
| D. | 7.45 V |
| Answer» B. 0.75 V | |
| 380. |
A dynamometer wattmeter is connected in ac circuit. The measured power is |
| A. | rms power |
| B. | average power |
| C. | peak power |
| D. | instantaneous power |
| Answer» C. peak power | |
| 381. |
Loss of charge method is suitable for medium resistances. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» C. May be True or False | |
| 382. |
If J is moment of Inertia, D is damping constant, C is spring constant, G is displacement constant and I is current throught the coil of DArsonval galvanometer, the equation of motion is |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» C. C | |
| 383. |
In figure the values of Rx and Cx are |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» B. B | |
| 384. |
In a resistance strain gauge, G = 2, stress = 1050 kg/cm², R = 1000 Ω. The value of ΔR will be |
| A. | 2 Ω |
| B. | 3 Ω |
| C. | 4 Ω |
| D. | 1 Ω |
| Answer» E. | |
| 385. |
If φsh is flux of shunt magnet, φse is flux of series magnet, ish is eddy current due to φse, the torque in an induction wattmeter is proportional to |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» C. C | |
| 386. |
The circuit of figure is used to measure the value Rx. Ammeter resistance Ra = 0.1 Ω voltmeter resistance Rv = 5000 Ω. It Rx1 and Rx2, are the measured values of Rx with switch in position 1 and 2, the mean of Rx1, and Rx2, is |
| A. | 9.98 Ω |
| B. | 10 Ω |
| C. | 10.04 Ω |
| D. | 10.1 Ω |
| Answer» D. 10.1 Ω | |
| 387. |
Figure shows the equivalent circuit of resistor. The resistor is non-inductive when |
| A. | R = L/C |
| B. | LR = √L/C |
| C. | L = CR² |
| D. | C = LR² |
| Answer» D. C = LR² | |
| 388. |
The damping ratio, in D'Arsonval galvanometer is equal to |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» C. C | |
| 389. |
In a ballistic galvanometer, a charge of 100 μC gives a first swing of 25°. The charge required to cause first swing of 50° is |
| A. | 200 μC |
| B. | 400 μC |
| C. | 50 μC |
| D. | 25 μC |
| Answer» C. 50 μC | |
| 390. |
In a CRO which of the following is not a part of electron gun |
| A. | cathode |
| B. | grid |
| C. | accelerating anode |
| D. | X - Y plates |
| Answer» E. | |
| 391. |
Two resistors R1 = 36 Ω ± 5% and R2 = 75 Ω ± 5% are connected in series. The total resistance is |
| A. | 111 ± 0 Ω |
| B. | 111 ± 2.778 Ω |
| C. | 111 ± 5.55 Ω |
| D. | 111 ± 7.23 Ω |
| Answer» D. 111 ± 7.23 Ω | |
| 392. |
An average responding voltmeter using full wave rectifier has been calibrated to read 1 V for 1 V rms sinusoidal input. For 1 V peak to peak square wave input, the meter reading will be |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» B. B | |
| 393. |
If σ is standard deviation, variation is |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» D. D | |
| 394. |
For critical damping, the resistance in D'Arsonval galvanometer circuit should be equal to |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» B. B | |
| 395. |
If M is mutual inductance between fixed and moving coils and θ is deflection of dynamometer instrument, then |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» B. B | |
| 396. |
In figure, the reading of wattmeter will be proportional |
| A. | V I cos θ |
| B. | √3 VI cos θ |
| C. | √3 VI sin θ |
| D. | V I sin θ |
| Answer» D. V I sin θ | |
| 397. |
If n measurements of a quantity are made, the arithmetic mean is |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» C. C | |
| 398. |
In figure the output V0 is |
| A. | 2V1 + V2 - 2V3 |
| B. | 2(V1 + V2) - V3 |
| C. | V1 + V2 + V3 |
| D. | V1 + 2V2 - V3 |
| Answer» B. 2(V1 + V2) - V3 | |
| 399. |
The standard deviation σ in terms of n observations having deviations from mean dm can be written as |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» C. C | |
| 400. |
Which of the following closely represents the resistance-temperature characteristics of thermistor? |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» B. B | |