MCQOPTIONS
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MCQOPTIONS
This section includes 9294 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 7301. |
A capacitance transducer can be used to measure |
| A. | thickness of sheet |
| B. | displacement |
| C. | level of fluids |
| D. | all of the above |
| Answer» E. | |
| 7302. |
The dynamometer principle can be used for |
| A. | ammeter only |
| B. | voltmeter only |
| C. | wattmeter only |
| D. | ammeter, voltmeter and wattmeter |
| Answer» E. | |
| 7303. |
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 | |
| 7304. |
Assertion (A): In hot wire instrument the material of hot wire in generally platinum iridium.Reason (R): A hot wire ammeter is suitable for ac only |
| 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 | |
| 7305. |
The scale of hot wire ammeter is |
| A. | linear |
| B. | non-linear |
| C. | cramped |
| D. | absolute linear |
| Answer» C. cramped | |
| 7306. |
The function of shunt in an ammeter is to |
| A. | by pass the current |
| B. | increase sensitivity of meter |
| C. | increase resistance of meter |
| D. | all of the above |
| Answer» B. increase sensitivity of meter | |
| 7307. |
Which of the following does not use the principle of change in inductance? |
| A. | LVDT |
| B. | Inductance displacement transducer |
| C. | Strain gauge |
| D. | Reluctance pick up |
| Answer» D. Reluctance pick up | |
| 7308. |
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 | |
| 7309. |
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 | |
| 7310. |
It is necessary to measure the amplitudes of two signals and also the phase difference between them. This can be done by using a |
| A. | phase meter |
| B. | waveform meter |
| C. | vector voltmeter |
| D. | digital voltmeter |
| Answer» C. vector voltmeter | |
| 7311. |
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 | |
| 7312. |
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 | |
| 7313. |
An amplifier has to amplify pulses of 1 H-s duration. The minimum bandwidth of amplifier must be |
| A. | 10 kHz |
| B. | 10 MHz |
| C. | 1 kHz |
| D. | 1 MHz |
| Answer» E. | |
| 7314. |
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 | |
| 7315. |
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 | |
| 7316. |
Which of the following methods can be used to measure power in a single phase circuit without using wattmeter? One voltmeter, one ammeterTwo voltmeters, two ammeterThree voltmetersThree ammeters |
| A. | 1 and 2 only |
| B. | 2 and 4 only |
| C. | 1 and 3 only |
| D. | 3 and 4 only |
| Answer» E. | |
| 7317. |
For measurement of surface temperature of solids the elements of RTD is usually in the shape of |
| A. | bar |
| B. | coil |
| C. | flat grid |
| D. | either (a) or (b) |
| Answer» D. either (a) or (b) | |
| 7318. |
Hay's bridge is suitable for inductances having low L/R ratio. |
| A. | True |
| B. | False |
| Answer» C. | |
| 7319. |
Moving iron instrument can be used for ac only. |
| A. | True |
| B. | False |
| Answer» C. | |
| 7320. |
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 | |
| 7321. |
An ammeter has a resistance of 50 ohms and a shunt of 0.01 Ω. The deflection is . If the shunt resistance is increased to 0.02 Ω, the deflection will be. |
| A. | |
| B. | 2 |
| C. | 0.5 |
| D. | 0.25 |
| Answer» C. 0.5 | |
| 7322. |
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 | |
| 7323. |
In most of instruments, the controlling torque is provided by |
| A. | fluid fraction |
| B. | spring |
| C. | eddy current |
| D. | either (a) or (c) |
| Answer» D. either (a) or (c) | |
| 7324. |
A 0-200 V voltmeter has a sensitivity of 1 kΩ per volt. The resistance of voltmeter is |
| A. | 1 kΩ |
| B. | 200 kΩ |
| C. | 100 kΩ |
| D. | 50 kΩ |
| Answer» C. 100 kΩ | |
| 7325. |
As per BIS, the number of accuracy classes of instrument is |
| A. | 5 |
| B. | 6 |
| C. | 7 |
| D. | 8 |
| Answer» E. | |
| 7326. |
DC ampere hour meter is an indicating instrument. |
| A. | True |
| B. | False |
| Answer» C. | |
| 7327. |
The accuracy of measurement by ohmmeter is very good. |
| A. | True |
| B. | False |
| Answer» C. | |
| 7328. |
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 | |
| 7329. |
A polyphase wattmeter basically consists of two wattmeters. The moving system of two wattmeters |
| A. | are common |
| B. | are separate |
| C. | are generally common |
| D. | are generally separate |
| Answer» B. are separate | |
| 7330. |
The current passing through a resistance of 100 0.2% Ω is 2 0.5% A. The limiting error in computation of power will be |
| A. | 0.7% |
| B. | 0.9% |
| C. | 1.2% |
| D. | 0.3% |
| Answer» D. 0.3% | |
| 7331. |
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 | |
| 7332. |
If the secondary burden of a CT 15 VA and secondary current is 5 A, the load impedance of CT is |
| A. | 0.6 Ω |
| B. | 5 Ω |
| C. | 6 Ω |
| D. | 10 Ω |
| Answer» B. 5 Ω | |
| 7333. |
Consider the following instruments Tangent galvanometerRayleigh current balanceHousehold energy meterHot wire ammeter Out of above absolute instruments are |
| A. | 1, 2 and 3 |
| B. | 1, 2 and 4 |
| C. | 1 and 2 |
| D. | 2, 3 and 4 |
| Answer» D. 2, 3 and 4 | |
| 7334. |
A 0-150 voltmeter has a guaranteed accuracy of 1% of full scale reading. If actual reading is 83 V, the percentage error is |
| A. | 0.83% |
| B. | 1% |
| C. | 1.81% |
| D. | none of the above |
| Answer» D. none of the above | |
| 7335. |
In a CRO, the frequency of output of time base generator |
| A. | is only one constant value |
| B. | is adjustable |
| C. | varies automatically |
| D. | either (a) or (c) |
| Answer» C. varies automatically | |
| 7336. |
The sensitivity of a voltmeter using 0-5 mA meter movement is |
| A. | 50 Ω/V |
| B. | 100 Ω/V |
| C. | 200 Ω/V |
| D. | 500 Ω/V |
| Answer» D. 500 Ω/V | |
| 7337. |
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. | |
| 7338. |
A voltage of about 200 V dc can be measured |
| A. | directly by dc potentiometer |
| B. | by dc potentiometer in conjunction with a volt ratio box |
| C. | a dc potentiometer in conjunction with a known resistance |
| D. | both (b) and (c) |
| Answer» C. a dc potentiometer in conjunction with a known resistance | |
| 7339. |
In a low power factor wattmeter, compensation for pressure coil current is provided. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 7340. |
A current of 3.25 A is flowing through a resistance of 34.98 Ω. The voltage drop across resistance to the appropriate number of significant figures is |
| A. | 113.685 V |
| B. | 113.68 V |
| C. | 113.6 V |
| D. | 114 V |
| Answer» E. | |
| 7341. |
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 | |
| 7342. |
For measuring mutual inductance we can use |
| A. | Anderson bridge |
| B. | Maxwell's bridge |
| C. | Heaviside bridge |
| D. | Either (a) or (b) |
| Answer» D. Either (a) or (b) | |
| 7343. |
A generated voltage is equally dependent on three resistances R1, R2, R3 and its value is V = (R1R2)/R3. If tolerance of each resistor is 0.1%, the maximum error in voltage is |
| A. | 0.3% |
| B. | 0.3% |
| C. | 0.1% |
| D. | 0.1% |
| Answer» C. 0.1% | |
| 7344. |
De Sauty bridge is very widely used due to |
| A. | simplicity |
| B. | perfect balance for imperfect capacitor |
| C. | perfect balance for air capacitors |
| D. | maximum sensitivity |
| Answer» B. perfect balance for imperfect capacitor | |
| 7345. |
A Weston synchronoscope is a |
| A. | moving coils instrument |
| B. | moving iron instrument |
| C. | dynamometer instrument |
| D. | induction instrument |
| Answer» D. induction instrument | |
| 7346. |
In a dynamometer 3 phase power factor meter, the planes of the two moving coils are at |
| A. | 60 |
| B. | 0 |
| C. | 120 |
| D. | 90 |
| Answer» D. 90 | |
| 7347. |
The braking torque in single phase energy meter is proportional to speed of disc. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 7348. |
To measure a resistance by a dc potentiometer |
| A. | it is necessary to standardise the potentiometer |
| B. | it is not necessary to standardise the potentiometer |
| C. | it is necessary to use a volt ratio box |
| D. | none of the above |
| Answer» C. it is necessary to use a volt ratio box | |
| 7349. |
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 | |
| 7350. |
A multimeter can be used as ohmmeter. |
| A. | True |
| B. | False |
| Answer» B. False | |