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.
| 401. |
What would be the reading of voltmeter as shown in below figure. The voltmeter has a 0-1 V scale and is a 20000 Ω/V meter |
| A. | 0.4545 V |
| B. | 0.082 V |
| C. | 0.82 V |
| D. | 4.54 V |
| Answer» C. 0.82 V | |
| 402. |
The current through a resistance R is shown in figure. The computed value of power is |
| A. | 400 ± 0.42 W |
| B. | 400 ± 4.6 W |
| C. | 400 ± 8.85 W |
| D. | 400 ± 10.65 W |
| Answer» D. 400 ± 10.65 W | |
| 403. |
In bridge circuit of figure, equivalent resistance between A and B is |
| A. | 1 Ω |
| B. | 0.5 Ω |
| C. | 2 Ω |
| D. | 1.5 Ω |
| Answer» B. 0.5 Ω | |
| 404. |
The ac bridge in figure is balanced. Z1 = 100∠30°, Z2 = 150∠0°, Z3 = 250∠ - 40° Then Z4 = |
| A. | 375∠70° Ω |
| B. | 375∠ - 70° Ω |
| C. | 150∠0° Ω |
| D. | 150∠20° Ω |
| Answer» C. 150∠0° Ω | |
| 405. |
If d1, d2, ..., dn are n individual deviations, the standard deviation is |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» B. B | |
| 406. |
Figure shows a Wheatstone bridge with RTD to one arm. If resistance of RTD = 1020 Ω, the voltage V0 is |
| A. | 49 mV |
| B. | 51 mV |
| C. | 48 mV |
| D. | 45 mV |
| Answer» B. 51 mV | |
| 407. |
Which of the following quantities have same dimension in emu and esu? 1. Current2. Electrical power3. Electrical energy Select the answer as per following codes |
| A. | 1 only |
| B. | 1 and 2 |
| C. | 2 and 3 |
| D. | 1 and 3 |
| Answer» D. 1 and 3 | |
| 408. |
In a thermocouple two metal junctions between metals M1 and M2 are kept at temperature T1 and T2. The thermocouple emf is produced because |
| A. | M1, M2 are similar and T1, T2 are equal |
| B. | M1, M2 are similar but T1, T2 are unequal |
| C. | M1, M2 are dissimilar but T1, T2 are equal |
| D. | M1, M2 are dissimilar but T1, T2 are unequal |
| Answer» E. | |
| 409. |
Which of these has poor overload capacity? |
| A. | PMMC instrument |
| B. | Hot wire instrument |
| C. | Dynamometer instrument |
| D. | Both (a) and (c) |
| Answer» C. Dynamometer instrument | |
| 410. |
Assertion (A): Maxwell bridge is for measuring inductance of medium magnitude.Reason (R): In Maxwell's bridge the unknown inductance is measured by comparing it with a capacitance. |
| A. | Both A and R are true and R is correct explanation of A |
| B. | Both A and R are true but R is not correct explanation of A |
| C. | A is true R is false |
| D. | A is false R is true |
| Answer» D. A is false R is true | |
| 411. |
Hay's bridge is suitable for inductances having low L/R ratio. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» C. May be True or False | |
| 412. |
If A = 131 ± 4 and B = 106 ± 4, the percentage range of doubt in A - B is |
| A. | 4% |
| B. | 8% |
| C. | 16% |
| D. | 32% |
| Answer» E. | |
| 413. |
In two wattmeter method of 3 phase power measurement, when does one wattmeter read negative |
| A. | when power factor is less than 0.5 lagging |
| B. | when power factor is greater than 0.5 lagging |
| C. | when power factor is less than 0.5 |
| D. | when power factor is unity |
| Answer» D. when power factor is unity | |
| 414. |
For measuring inductance with high Q, we should use |
| A. | Maxwell's bridge |
| B. | Maxwell Wien bridge |
| C. | Hay's bridge |
| D. | Either (a) or (b) |
| Answer» D. Either (a) or (b) | |
| 415. |
The operating voltage of a megger is about |
| A. | 100 V |
| B. | 12 V |
| C. | 6 V |
| D. | 1 V |
| Answer» B. 12 V | |
| 416. |
Assertion (A): The gall tinsley potentiometer is a coordinate potentiometer and has two exactly similar potentiometers.Reason (R): An ac potentiometer may measure the unknown voltage in polar form or rectangular coordinate form. |
| A. | Both A and R are true and R is correct explanation of A |
| B. | Both A and R are true but R is not correct explanation of A |
| C. | A is true R is false |
| D. | A is false R is true |
| Answer» C. A is true R is false | |
| 417. |
In dc tacho generators used for measurement of speed of shaft, frequent calibration is necessary because |
| A. | contacts wear off |
| B. | strength of permanent magnet decreases with age |
| C. | armature current produces heating effect |
| D. | there is back emf |
| Answer» C. armature current produces heating effect | |
| 418. |
To measure an emf by dc potentiometer it is necessary to standardise the potentiometer with the help of a standard cell. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» B. False | |
| 419. |
A meter coil has a resistance of 100 Ω and a full scale deflection current of 10 mA. To convert it into a voltmeter of 0-200 V range, the series resistance should be |
| A. | 20 kΩ |
| B. | 19.9 kΩ |
| C. | 1.9 kΩ |
| D. | 20.1 kΩ |
| Answer» C. 1.9 kΩ | |
| 420. |
In a digital measuring device the input electrical signal is in the frequency range of dc to ac (50) Hz. It must be sampled at a rate of |
| A. | f times/sec |
| B. | 0.5 f times/sec |
| C. | 0.25 f times/sec |
| D. | 2 f times/sec |
| Answer» E. | |
| 421. |
Which of the following transformers has low primary current? |
| A. | Current transformer |
| B. | Potential transformer |
| C. | Distribution transformer |
| D. | Both (a) and (b) |
| Answer» C. Distribution transformer | |
| 422. |
The coil of a DArsonval galvanometer has N turns. If flux density is B, current is I and area of coil is A, the deflecting torque is |
| A. | NBI/A |
| B. | NBIA |
| C. | NIA/B |
| D. | N2IAB |
| Answer» C. NIA/B | |
| 423. |
Consider the following features of an instrument I. suitable for both ac and dcII. free from hysteresis and eddy current errorsIII. No waveform and frequency errorsIV. it is essentially a voltmeter This instrument is |
| A. | moving iron |
| B. | moving coil |
| C. | electrostatic |
| D. | dynamometer |
| Answer» D. dynamometer | |
| 424. |
In a strain measuring device using a strain gauge, the output quantity is |
| A. | voltage |
| B. | resistance |
| C. | impedance |
| D. | either (a) or (b) |
| Answer» B. resistance | |
| 425. |
A single phase energy meter has the rating 1200 resolutions/ kWh. If a 500 W electric gadget is used for 4 hours, the energy meter will make |
| A. | 1200 revolutions |
| B. | 1800 revolutions |
| C. | 2100 revolutions |
| D. | 2400 revolutions |
| Answer» E. | |
| 426. |
Potentiometer method of dc voltage measurement is more accurate than direct measurement using a voltmeter because |
| A. | it loads the circuit to maximum extent |
| B. | it loads the circuit moderately |
| C. | it does not load the circuit at all |
| D. | it uses centre zero galvanometer instead of Voltmeters |
| Answer» D. it uses centre zero galvanometer instead of Voltmeters | |
| 427. |
The percentage limiting error in an instrument reading 8.3 V and having guaranteed accuracy of 1% of the full scale reading and range of 0-150 V is |
| A. | 1.81% |
| B. | 0.181% |
| C. | 18.1% |
| D. | 0.0018% |
| Answer» D. 0.0018% | |
| 428. |
An electrodynamometer instrument has the advantage of |
| A. | freedom from hysteresis and eddy currents because air cored coils are used |
| B. | freedom from hysteresis and eddy currents because cores of coils have special ferromagnetic material |
| C. | high torque/weight ratio |
| D. | low cost |
| Answer» B. freedom from hysteresis and eddy currents because cores of coils have special ferromagnetic material | |
| 429. |
Consider the following statements1. Thermistor is more sensitive than platinum resistance thermometer2. The resistance of thermistor is solely a function of its absolute temperature whether the source of heat is external or internal3. Thermistor has linear temperature-resistance relationship4. Thermistor has linear negative temperature coefficient Of the Statements, the correct statements are |
| A. | 1 and 2 |
| B. | 3 and 4 |
| C. | 1, 2, 3, 4 |
| D. | 1, 2 and 4 |
| Answer» E. | |
| 430. |
Assertion (A): De sauty's bridge is suitable only for pure capacitor.Reason (R): Capacitors are mostly perfect. |
| A. | Both A and R are true and R is correct explanation of A |
| B. | Both A and R are true but R is not correct explanation of A |
| C. | A is true R is false |
| D. | A is false R is true |
| Answer» D. A is false R is true | |
| 431. |
A resistance wire strain gauge has gauge factor 2. If stress is 100 mega newton/m² and Young's modulus is 200 giga newton/ m², the percentage change in gauge resistance due to stress is |
| A. | 0.1 |
| B. | 0.2 |
| C. | 0.4 |
| D. | 0.5 |
| Answer» B. 0.2 | |
| 432. |
The channel required for FM telemetry is |
| A. | same as required for AM telemetry |
| B. | smaller than that required by AM telemetry |
| C. | 100 times that required for AM telemetry |
| D. | 10 times that required for AM telemetry |
| Answer» D. 10 times that required for AM telemetry | |
| 433. |
Assertion (A): A semiconductor strain gauge is more accurate than a resistance strain gauge.Reason (R): The gauge factor of a semiconductor strain gauge is about 100 where as the gauge factor of a resistance strain gauge is only about 2. |
| A. | Both A and R are true and R is correct explanation of A |
| B. | Both A and R are true but R is not correct explanation of A |
| C. | A is true R is false |
| D. | A is false R is true |
| Answer» B. Both A and R are true but R is not correct explanation of A | |
| 434. |
A radiation thermometer is suitable for temperatures |
| A. | below 500°C |
| B. | below 100°C |
| C. | above 500°C |
| D. | above 1400°C |
| Answer» E. | |
| 435. |
Measurement of non-electrical quantity involves the following subsystems 1. Amplifier block2. Display block3. Instrumentation block4. Transducer block The correct sequence of these blocks is |
| A. | 4, 1, 3, 2 |
| B. | 4, 3, 1, 2 |
| C. | 1, 3, 2, 4 |
| D. | 1, 2, 3, 4 |
| Answer» B. 4, 3, 1, 2 | |
| 436. |
The resistance of series field winding is a low resistance. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» B. False | |
| 437. |
The D'Arsonval- movement can be converted into audio frequency ac ammeter by adding a |
| A. | thermocouple |
| B. | transducer |
| C. | chopper |
| D. | rectifier |
| Answer» E. | |
| 438. |
In figure, C0 is distributed capacitance and C is tuning capacitor. If C = C1 for fundamental frequency and C = C2 for second harmonic, then C0 = |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» C. C | |
| 439. |
A moving iron instrument gives correct reading when used at |
| A. | low frequencies |
| B. | high frequencies |
| C. | only one frequency |
| D. | all frequencies upto a certain value |
| Answer» D. all frequencies upto a certain value | |
| 440. |
In measuring resistance using voltmeter and ammeter, the resistances of voltmeter and ammeter also affect the accuracy of measurement. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» B. False | |
| 441. |
Assertion (A): Hay's bridge in particularly suitable for measuring inductance having a comparatively low resistance.Reason (R): In Hay's bridge the value of frequency supply must be known. |
| A. | Both A and R are true and R is correct explanation of A |
| B. | Both A and R are true but R is not correct explanation of A |
| C. | A is true R is false |
| D. | A is false R is true |
| Answer» C. A is true R is false | |
| 442. |
It is required to measure the true open circuit emf of a battery. The best device is |
| A. | dc voltmeter |
| B. | ammeter and known resistance |
| C. | dc potentiometer |
| D. | either (a) or (c) |
| Answer» D. either (a) or (c) | |
| 443. |
Burden of an instrument transformer is expressed in |
| A. | A |
| B. | V-A |
| C. | Ω |
| D. | watt |
| Answer» C. Ω | |
| 444. |
The time base generator in a CRO gives an output which is |
| A. | low frequency sinusoidal |
| B. | high frequency sinusoidal |
| C. | low frequency rectangular |
| D. | high frequency sawtooth |
| Answer» E. | |
| 445. |
A linear displacement digital transducer generally uses |
| A. | straight binary code |
| B. | BCD |
| C. | gray code |
| D. | hexadecimal code |
| Answer» D. hexadecimal code | |
| 446. |
A high resistance was measured by loss of charge method. The voltmeter resistance was 10¹ᴼ ohms. The calculation gave the value of unknown resistance as 0.8 x 10⁹ ohms. The true value of resistance is |
| A. | 0.8 x 10⁹ Ω |
| B. | less than 0.8 x 10⁹ Ω |
| C. | more than 0.8 x 10⁹ Ω |
| D. | either (b) or (c) |
| Answer» D. either (b) or (c) | |
| 447. |
The signal to noise ratio in telemetry should be better than |
| A. | 5 db |
| B. | 10 db |
| C. | 25 db |
| D. | 60 db |
| Answer» E. | |
| 448. |
Assertion (A): Secondary instruments require calibration at frequent intervals.Reason (R): Secondary instruments have many errors. |
| A. | Both A and R are true and R is correct explanation of A |
| B. | Both A and R are true but R is not correct explanation of A |
| C. | A is true R is false |
| D. | A is false R is true |
| Answer» B. Both A and R are true but R is not correct explanation of A | |
| 449. |
Panel instruments are generally mounted vertically. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» B. False | |
| 450. |
The scale of thermocouple instrument is linear. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» C. May be True or False | |