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.
| 451. |
Assertion (A): The sign and magnitude of displacement can be measured by an LVDT.Reason (R): LVDT is based on the principle of mutual inductance. |
| 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 | |
| 452. |
LVDT is used to measure |
| A. | displacement |
| B. | pressure |
| C. | temperature |
| D. | any of the above |
| Answer» B. pressure | |
| 453. |
While calibrating an ammeter by a dc potentiometer it is necessary to use a standard resistance. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» B. False | |
| 454. |
The current in a circuit is measured using a 150 : 1 CT If the ammeter reads 0.6 A, the circuit current is |
| A. | 250 A |
| B. | 90 A |
| C. | 156 A |
| D. | 144 A |
| Answer» C. 156 A | |
| 455. |
Assertion (A): Energy meters use induction principle.Reason (R): Induction wattmeter is less accurate than a dynamometer wattmeter. |
| 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 | |
| 456. |
A variable reluctance type tachometer has 150 teeth on rotor. The counter records 13500 pulse/sec. The rotational speed is |
| A. | 4800 RPM |
| B. | 5400 RPM |
| C. | 6000 RPM |
| D. | 7200 RPM |
| Answer» C. 6000 RPM | |
| 457. |
Assertion (A): An RTD uses platinum coil.Reason (R): Platinum is a very stable material. |
| 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 | |
| 458. |
If Eb is the potential of accelerating anode, the energy of electrons as they emerge from electron gun is proportional to |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» C. C | |
| 459. |
LVDT is a |
| A. | pressure transducer |
| B. | displacement transducer |
| C. | velocity transducer |
| D. | acceleration transducer |
| Answer» C. velocity transducer | |
| 460. |
The accuracy of a multimeter is about |
| A. | ± 0.5% |
| B. | ± 3% |
| C. | ± 0.01% |
| D. | ± 10% |
| Answer» C. ± 0.01% | |
| 461. |
In a low power factor wattmeter, the resistance of pressure coil is more than in ordinary wattmeter. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» B. False | |
| 462. |
The loss of charge method can be used to measure |
| A. | resistance of shunt |
| B. | insulation resistance of cable |
| C. | resistance of shunt winding |
| D. | both (b) and (c) |
| Answer» C. resistance of shunt winding | |
| 463. |
An average responding rectifier type electronic voltmeter has its scale calibrated in terms of rms value of sine wave. If 100 V peak value square wave is fed to this voltmeter, the reading will be |
| A. | 111 V |
| B. | 100 V |
| C. | 90.9 V |
| D. | 70.7 V |
| Answer» B. 100 V | |
| 464. |
Which of the following instruments can be used for dc as well ac upto a few MHz?1. Moving iron instrument2. Thermocouple instrument3. Induction instrument4. Moving coil instrument Select the correct answer as per following codes |
| A. | 2 only |
| B. | 2 and 3 only |
| C. | 1, 2 and 3 only |
| D. | 2 and 4 only |
| Answer» B. 2 and 3 only | |
| 465. |
Assertion (A): A power factor meter operates on dynamometer principle. Reason (R): A power factor meter does not have a control spring. |
| 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 | |
| 466. |
A permanent magnet moving coil meter can be used as |
| A. | ac only |
| B. | dc only |
| C. | both ac and dc |
| D. | low frequency ac and dc |
| Answer» E. | |
| 467. |
A dynamometer wattmeter is suitable for both dc and ac. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» B. False | |
| 468. |
In semiconductor strain gauge |
| A. | resistance increases with strain |
| B. | resistance decreases with strain |
| C. | resistance increases with strain in p type and decreases with strain in n type |
| D. | resistance increases with strain in n type and decreases with strain in p type |
| Answer» D. resistance increases with strain in n type and decreases with strain in p type | |
| 469. |
The output of a Piezoelectric crystal has |
| A. | low amplitude and low impedance |
| B. | high amplitude and low impedance |
| C. | low amplitude and high impedance |
| D. | high amplitude and high impedance |
| Answer» D. high amplitude and high impedance | |
| 470. |
Assertion (A): Shunt of an ammeter has a low resistance.Reason (R): Shunt may be connected in series or in parallel with ammeter. |
| 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 | |
| 471. |
In figure, Za = 100∠50°, Zb = 300∠-90° and Zc = 200∠0°. For balanced condition, Zd will be |
| A. | 600∠ - 40° |
| B. | 600∠140° |
| C. | 600∠ - 140° |
| D. | 150∠140° |
| Answer» D. 150∠140° | |
| 472. |
DC ampere hour meter is an indicating instrument. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» C. May be True or False | |
| 473. |
The pressure coil of a wattmeter should be connected to the supply side of the current coil when |
| A. | load impedance in high |
| B. | load impedance is low |
| C. | voltage is high |
| D. | voltage is low |
| Answer» B. load impedance is low | |
| 474. |
Assertion (A): When a wattmeter is used for low impedance loads, the pressure coil is connected across the load.Reason (R): A wattmeter measures apparent power. |
| 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 | |
| 475. |
In electronic voltmeters the measuring device is a |
| A. | moving coil instrument |
| B. | moving iron instrument |
| C. | dynamometer instrument |
| D. | none of the above |
| Answer» B. moving iron instrument | |
| 476. |
If σ standard deviation, probable error |
| A. | σ |
| B. | ± 1.19 σ |
| C. | ± 0.6745 σ |
| D. | ± 0.4125 σ |
| Answer» D. ± 0.4125 σ | |
| 477. |
A dual trace CRO has |
| A. | one electron gun |
| B. | two electron guns |
| C. | one electron gun with one two pole switch |
| D. | two electron guns with one two pole switch |
| Answer» D. two electron guns with one two pole switch | |
| 478. |
A meter with a resistance of 100 Ω and a full scale deflection of current of 1 mA is to be converted into voltmeter of 0 - 5 V range. The multiplier resistance should be |
| A. | 490 Ω |
| B. | 5000 Ω |
| C. | 4900 Ω |
| D. | 5100 Ω |
| Answer» D. 5100 Ω | |
| 479. |
Capacitive transducer is superior to inductive type for measurement of capacitance because of |
| A. | absence of non-linearity |
| B. | high frequency response |
| C. | small size |
| D. | high accuracy |
| Answer» C. small size | |
| 480. |
Consider the following statements about a moving iron instrument1. It is an unpolarised instrument.2. It has permanent magnet.3. It has a fixed coil.4. It has two iron vanes. Of these statements |
| A. | 1, 2, 3 are correct |
| B. | 1, 2, 4 are correct |
| C. | 1, 3 and 4 are correct |
| D. | 2, 3, 4 are correct |
| Answer» D. 2, 3, 4 are correct | |
| 481. |
A Hall effect transducer has KH = - 1 x 10¯⁸. If B = 1 Wb/m², I = 3 A and bismuth slab is 2 mm wide, the Hall voltage is |
| A. | -7.5 x 10¯⁶ V |
| B. | -15 x 10¯⁶ |
| C. | -20 x 10¯⁴ V |
| D. | -22.5 x 10¯⁴ V |
| Answer» C. -20 x 10¯⁴ V | |
| 482. |
In an ac single phase energy meter, the potential coil is put on |
| A. | both side limbs, of upper magnet |
| B. | central limb of upper magnet |
| C. | one side limb of upper magnet |
| D. | either (a) or (b) |
| Answer» C. one side limb of upper magnet | |
| 483. |
For a current transformer, the standard secondary rating is |
| A. | 1 A or 5 A |
| B. | 2.5 A |
| C. | 10 A |
| D. | 5 A or 10 A |
| Answer» B. 2.5 A | |
| 484. |
In a semiconductor strain gauge, the ohmic electrical contacts are generally made of |
| A. | copper wire |
| B. | gold wire |
| C. | aluminium wire |
| D. | nickel wire |
| Answer» C. aluminium wire | |
| 485. |
The Lissajous pattern observed on screen of CRO is a straight line inclined at 45° to x axis. If X-plate input is 2 sin ωt, the Y-plate input is |
| A. | 2 sin ωt |
| B. | 2 sin (ωt + 45°) |
| C. | 2 sin (ωt - 45°) |
| D. | 2√2 sin ωt + 45°) |
| Answer» B. 2 sin (ωt + 45°) | |
| 486. |
When a capacitor is connected to the terminals of an ohmmeter, the pointer indicated a low resistance initially and finally come to infinity position. This shows that capacitor is |
| A. | short circuited |
| B. | all right |
| C. | faulty |
| D. | open circuited |
| Answer» C. faulty | |
| 487. |
A 300 V voltmeter has an accuracy of ± 2% of full scale deflection. When the reading is 222 V, the actual voltage |
| A. | lies between 217.56 and 226.44 V |
| B. | lies between 217.4 and 226.6 V |
| C. | lies between 216 and 228 V |
| D. | is exact 222 V |
| Answer» D. is exact 222 V | |
| 488. |
In a single phase power factor meter the phase difference between currents in the two pressure coils is |
| A. | exactly 0° |
| B. | approximate 0° |
| C. | exactly 90° |
| D. | approximate 90° |
| Answer» D. approximate 90° | |
| 489. |
Which of the following draws minimum power from source? |
| A. | PMMC |
| B. | Electronic voltmeter |
| C. | Electrostatic voltmeter |
| D. | Moving iron voltmeter |
| Answer» C. Electrostatic voltmeter | |
| 490. |
For measuring a very high resistance we should use |
| A. | Kelvin's double bridge |
| B. | Wheatstone bridge |
| C. | Meggar |
| D. | Either (a) or (c) |
| Answer» D. Either (a) or (c) | |
| 491. |
A moving coil instrument has a resistance of 0.6 Ω and full scale deflection at 0.1 A. To convert it into an ammeter of 0-15 A range, the resistance of shunt should be |
| A. | 0.6 Ω |
| B. | 0.06 Ω |
| C. | 0.1 Ω |
| D. | 0.004 Ω |
| Answer» E. | |
| 492. |
Assertion (A): In loss of charge method, it is preferable to use an electronic voltmeter.Reason (R): The resistance of electronic voltmeter is very high. |
| 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 | |
| 493. |
To increase Q factor of a coil, the wire should be |
| A. | long |
| B. | thin |
| C. | thick |
| D. | long and thin |
| Answer» D. long and thin | |
| 494. |
The most serious problems in ac bridge measurement is |
| A. | eddy currents |
| B. | leakage current |
| C. | residual magnetism |
| D. | stray fields |
| Answer» E. | |
| 495. |
In 3 phase power measurement by two wattmeter method, the reading of one wattmeter is zero. The power factor of load is |
| A. | 1 |
| B. | 0.5 |
| C. | 0 |
| D. | 0.8 |
| Answer» C. 0 | |
| 496. |
The resistance of resistance strain gauge is about |
| A. | 5 Ω |
| B. | 50 Ω |
| C. | 120 Ω |
| D. | 0.5 Ω |
| Answer» D. 0.5 Ω | |
| 497. |
The phenomenon of creep occurs in |
| A. | energy meters |
| B. | voltmeters |
| C. | ammeters |
| D. | wattmeters |
| Answer» B. voltmeters | |
| 498. |
Which of the following, is not a piezoelectric material? |
| A. | Rochelle salt |
| B. | Quartz |
| C. | Lithium sulphate |
| D. | Sodium bicarbonate |
| Answer» E. | |
| 499. |
In figure, Z1 = 200∠60° Ω, Z2 = 400∠ - 90° Ω, Z3 = 300∠0°. Then Z4 for bridge to be balanced is |
| A. | 150∠30° Ω |
| B. | 400∠ - 90° Ω |
| C. | 300∠90° Ω |
| D. | 600∠ - 150° Ω |
| Answer» E. | |
| 500. |
In figure the bridge is balanced when Z4 is |
| A. | 120∠70° |
| B. | 187.5∠ - 10° |
| C. | 187.5∠ - 70° |
| D. | 333.3∠ - 70° |
| Answer» D. 333.3∠ - 70° | |