MCQOPTIONS
Saved Bookmarks
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.
| 301. |
The sensitivity of a potentiometer can be increased by |
| A. | increasing the length of wire |
| B. | decreasing the length of wire |
| C. | increasing the current in the wire |
| D. | decreasing the current in the wire |
| Answer» B. decreasing the length of wire | |
| 302. |
Assertion (A): If the resistance of shunt of an ammeter is increased, the range of ammeter is reduced.Reason (R): If the series resistance of a voltmeter is increased, the range of voltmeter is increased. |
| 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 | |
| 303. |
Assertion (A): A 3 phase wattmeter consists of two wattmeters mounted in one case.Reason (R): Power measurement in a 3 phase circuit can be conveniently done by two wattmeter method. |
| 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 | |
| 304. |
Which bridge can be used to measure frequency? |
| A. | Maxwell |
| B. | Kelvin |
| C. | Schering |
| D. | Wein |
| Answer» E. | |
| 305. |
Which one of the following is true? |
| A. | Alternating voltage and current contain odd and even harmonics |
| B. | The inductance in a circuit reduces the effect of harmonics and makes current wave more sinusoidal than voltage wave |
| C. | Alternating voltage and current waveforms, in general, do not contain odd harmonics |
| D. | Inductance of a circuit does not alter wave shape at all |
| Answer» C. Alternating voltage and current waveforms, in general, do not contain odd harmonics | |
| 306. |
A moving iron instrument can be used for |
| A. | dc only |
| B. | ac only |
| C. | both dc and ac |
| D. | dc and high frequency ac |
| Answer» D. dc and high frequency ac | |
| 307. |
The resistance in the circuit of the moving coil of a dynamometer wattmeter should be |
| A. | very low |
| B. | low |
| C. | high |
| D. | almost zero |
| Answer» D. almost zero | |
| 308. |
Which of the following is not correct in respect of electrostatic instrument? |
| A. | It is essentially a voltmeter |
| B. | It is suitable for only high voltages |
| C. | It has a uniform scale |
| D. | It can be used for both ac and dc |
| Answer» D. It can be used for both ac and dc | |
| 309. |
A capacitance transducer has two plates each of area 5 mm². The coil gap is 2 mm. Displacement sensitivity due to change in gap length is |
| A. | 11.1 pF/cm |
| B. | 44.2 pF/cm |
| C. | 52.3 pF/cm |
| D. | 66.3 pF/cm |
| Answer» B. 44.2 pF/cm | |
| 310. |
Consider the following statements regarding electro-dynamometer type indicating instrument It can be used for measuring1. Direct current2. Alternating current3. Direct voltage4. Alternating voltage Of these statements |
| A. | 1 and 2 are corect |
| B. | 3 and 4 are correct |
| C. | 1 and 3 are correct |
| D. | 1, 2, 3, 4 are correct |
| Answer» E. | |
| 311. |
The total insulation resistance consists of insulation volume resistance and surface leakage resistance. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» B. False | |
| 312. |
Watthour meter is an integrating instrument |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» B. False | |
| 313. |
If A = 629 ± 8 and B = 131 ± 3, A - B with range of doubt is |
| A. | 498 ± 8 |
| B. | 498 ± 4 |
| C. | 498 ± 11 |
| D. | 498 ± 13 |
| Answer» D. 498 ± 13 | |
| 314. |
In indicating instruments the controlling torque is provided by a spring. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» B. False | |
| 315. |
If a shunt of 200 Ω resistance is used with a galvanometer of 1000 Ω resistance, the multiplying power is |
| A. | 6 |
| B. | 5 |
| C. | 1/5 |
| D. | 1/6 |
| Answer» B. 5 | |
| 316. |
An LVDT is used to measure displacement. The LVDT feeds a Voltmeter of 0-5 V range through a 250 gain amplifier. For a displacement 0.5 mm the output of LVDT is 2 mV. The sensitivity of instrument is |
| A. | 0.1 V/mm |
| B. | 0.5 V/mm |
| C. | 1 V/mm |
| D. | 5 V/mm |
| Answer» D. 5 V/mm | |
| 317. |
The range of RTD using platinum is about |
| A. | -100° C to 700°C |
| B. | -200°C to 1000°C |
| C. | 100°C to 1000°C |
| D. | about 500°C |
| Answer» B. -200°C to 1000°C | |
| 318. |
The resistance of a 125 Ω strain gauge changes by 1 ohm for 4000 micro strain. The gauge factor is |
| A. | 1.5 |
| B. | 2 |
| C. | 2.5 |
| D. | 3 |
| Answer» C. 2.5 | |
| 319. |
The numbers of accelerating anodes in a CRO is |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» C. 3 | |
| 320. |
Two ammeters having resistances of 0.5 Ω and 0.25 Ω and having full scale reading of 25 A each are connected in parallel. To ensure that neither of them goes beyond scale, the total current should not be more than |
| A. | 50 A |
| B. | 37.5 A |
| C. | 25 A |
| D. | 40 A |
| Answer» C. 25 A | |
| 321. |
The electromagnets of an induction wattmeter |
| A. | are laminated |
| B. | are not laminated |
| C. | may be laminated |
| D. | must not be laminated |
| Answer» B. are not laminated | |
| 322. |
A digital voltmeter can count from 0 to 9999. If full scale reading is 9.999 V, the resolution of full scale reading is |
| A. | 0.001 |
| B. | 1000 |
| C. | 2 digit |
| D. | 1 mV |
| Answer» E. | |
| 323. |
An instrument of accuracy class 1 can have an error equal to |
| A. | + 1% of reading |
| B. | ± 1% of reading |
| C. | ± 1% of full scale deflection |
| D. | + 1% of full scale deflection |
| Answer» D. + 1% of full scale deflection | |
| 324. |
A data signal having frequency components from dc to 50 Hz is to be sent through pulse code modulation using an 8 digit code. The minimum carrier channel bandwidth is |
| A. | 1 kHz |
| B. | 2 kHz |
| C. | 4 kHz |
| D. | 8 kHz |
| Answer» D. 8 kHz | |
| 325. |
Shaft encoder is used to measure |
| A. | angular position |
| B. | linear position |
| C. | linear velocity |
| D. | linear acceleration |
| Answer» B. linear position | |
| 326. |
The most commonly used moving iron instruments are |
| A. | repulsion type |
| B. | attraction type |
| C. | a combination of attraction and repulsion type |
| D. | none of the above |
| Answer» B. attraction type | |
| 327. |
A Weston frequency meter is |
| A. | moving coil instrument |
| B. | moving iron instrument |
| C. | dynamometer instrument |
| D. | induction instrument |
| Answer» C. dynamometer instrument | |
| 328. |
If low pressure of 10¯⁶ mm of Hg is required to be measured, we should use |
| A. | compound pressure gauge |
| B. | thermocouple vacuum gauge |
| C. | Pirani gauge |
| D. | ionization type vacuum gauge |
| Answer» D. ionization type vacuum gauge | |
| 329. |
The resistance of voltmeter affects the accuracy of measurement in loss of charge method. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» B. False | |
| 330. |
Two meters X and Y require 40 mA and 50 mA for full scale deflection. Then |
| A. | X is more sensitive |
| B. | Y is more sensitive |
| C. | both are equally sensitive |
| D. | it is not possible to determine from given data |
| Answer» E. | |
| 331. |
When deflecting torque and braking torque in an energy meter are zero, |
| A. | the disc rotates at steady speed |
| B. | the disc is stationary |
| C. | the disc accelerates |
| D. | the disc retards |
| Answer» B. the disc is stationary | |
| 332. |
Consider the following operation in respect of Wheatstone bridge (Kb, denotes battery key, Kg denotes galvanometer key)1. open Kb2. close Kg3. close Kb4. open Kg The correct sequence of operations is |
| A. | 1, 2, 3, 4 |
| B. | 3, 1, 2, 4 |
| C. | 4, 3, 2, 1 |
| D. | 3, 2, 4, 1 |
| Answer» E. | |
| 333. |
The coil of a moving coil meter has 100 turns, is 40 mm long and 30 mm wide. The control torque is 240 x 10¯⁶ N-m on full scale. If B = 1 Wb/m², range of meter is |
| A. | 1 mA |
| B. | 2 mA |
| C. | 3 mA |
| D. | 4 mA |
| Answer» C. 3 mA | |
| 334. |
Wheatstone bridge is suitable for low resistances. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» C. May be True or False | |
| 335. |
RTD is generally suitable for temperature up to |
| A. | about 800°C |
| B. | about 1500°C |
| C. | about 200°C |
| D. | about 50°C |
| Answer» B. about 1500°C | |
| 336. |
Rayleigh current balance is an absolute instrument. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» B. False | |
| 337. |
A resistance is measured by voltmeter-ammeter method. The voltmeter is 0-250V, ± 1% accuracy and ammeter is 0-5 A, ± 1 % accuracy. The readings of voltmeter and ammeter are 100 V and 2 A respectively. The error in the measured resistance can be |
| A. | ± 1% |
| B. | ± 2% |
| C. | ± 5% |
| D. | ± 10% |
| Answer» D. ± 10% | |
| 338. |
In an Anderson bridge the unknown inductance is measured in terms of |
| A. | known inductance and resistance |
| B. | known inductance |
| C. | known capacitance and resistance |
| D. | known capacitance |
| Answer» D. known capacitance | |
| 339. |
Schering bridge operates at a high voltage of about 10 kV. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» B. False | |
| 340. |
The accuracy of an instrument is determined by |
| A. | closeness of indicated value to the actual value |
| B. | repeatability of measured value |
| C. | speed with which the reading approaches final value |
| D. | least value which can be measured |
| Answer» B. repeatability of measured value | |
| 341. |
Assertion (A): Double Kelvin's bridge is used to measure low resistances.Reason (R): In low resistance, the contact and lead resistances are very important. |
| 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 | |
| 342. |
Assertion (A): When frequencies of signals fed to X and Y plates of CRO are multiples of each other, Lissajous pattern is displayed on screen.Reason (R): In a CRO, the vertical deflection is proportional to voltage applied to Y plates. |
| 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 | |
| 343. |
In household energy meters the flux of series magnet is in phase with current but the flux of shunt magnet lags the voltage by 88°. The reading of energy meters |
| A. | will be correct |
| B. | will have a negative error |
| C. | will have a positive error |
| D. | may have positive or negative error |
| Answer» C. will have a positive error | |
| 344. |
In which of the following instruments is the deflecting torque proportional to dL/dQ where L is inductance of coil and Q is deflection |
| A. | PMMC |
| B. | electrostatic |
| C. | moving iron |
| D. | both (a) and (b) |
| Answer» D. both (a) and (b) | |
| 345. |
The flow rate of electrically conducting liquid without any suspended particle can not be measured by |
| A. | turbine flow meter |
| B. | electromagnetic flow meter |
| C. | ultrasonic flow meter |
| D. | thermistor based heat flow meter |
| Answer» E. | |
| 346. |
To measure a resistance of about 8 ohms we should use |
| A. | Kelvin's double bridge |
| B. | Wheatstone bridge |
| C. | Meggar |
| D. | Either (b) or (c) |
| Answer» C. Meggar | |
| 347. |
In measuring a resistance by voltmeter-ammeter method, the voltmeter can be connected either across supply or across the resistance. If the resistance is low, the voltmeters should be connected |
| A. | across the supply |
| B. | across the resistance |
| C. | either in two positions |
| D. | preferably across the supply |
| Answer» C. either in two positions | |
| 348. |
Consider the following Statements regarding resistance strain gauge 1. The gauge factor is in the range of 2 to 5.2. The resistance changes due to change in specific resistance with strain.3. The resistance increases with increase in temperature. Of the above statements, which are correct? |
| A. | 1, 2, 3 |
| B. | 1 and 2 |
| C. | 2 and 3 |
| D. | 1 and 3 |
| Answer» E. | |
| 349. |
A diode peak reading VTVM and thermocouple meter are connected across output of an amplitude modulated circuit. In the absence of modulation both meters read 10 V. When sinusoidal AM is applied, VTVM reads 15V The reading of thermocouple meter will be |
| A. | 10 V |
| B. | 12.5 V |
| C. | 14.1 V |
| D. | 15 V |
| Answer» B. 12.5 V | |
| 350. |
To avoid the effect of stray magnetic fields in ac bridge we can use |
| A. | magnetic screening |
| B. | Wagner earthing device |
| C. | wave filter |
| D. | transformer |
| Answer» B. Wagner earthing device | |