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.
| 7251. |
Two resistances are : R1 = 36 Ω 1.89 Ω and R2 = 75 Ω 3.75 Ω. The sum R1 + R2 along with limiting error is |
| A. | 111 Ω 1.8 Ω |
| B. | 111 Ω 3.75 Ω |
| C. | 111 Ω 5.55 Ω |
| D. | 111 Ω 1.95 Ω |
| Answer» D. 111 Ω 1.95 Ω | |
| 7252. |
The Y plates of a CRO are excited by a voltage 2 sin 100 t and the X plates are not connected. The display would be |
| A. | a vertical line |
| B. | a horizontal line |
| C. | sine wave |
| D. | slant line |
| Answer» B. a horizontal line | |
| 7253. |
Heating effect of current is used in |
| A. | ammeters |
| B. | voltmeters |
| C. | both ammeters and voltmeters |
| D. | wattmeters |
| Answer» D. wattmeters | |
| 7254. |
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 | |
| 7255. |
A 1 mA meter is to be converted to 1 A ammeter. The meter resistance is 100 Ω. The value of shunt resistance is |
| A. | 0.001 Ω |
| B. | 0.1001 Ω |
| C. | 100 Ω |
| D. | 1000 Ω |
| Answer» C. 100 Ω | |
| 7256. |
The use of thermocouple meters for ac measurement leads to a scale which is |
| A. | linear |
| B. | square law |
| C. | logarithmic |
| D. | exponential |
| Answer» C. logarithmic | |
| 7257. |
Assertion (A): A low power factor wattmeter has special constructional features to ensure accurate measurement.Reason (R): Extension of wattmeter range in dc circuit can be easily done by using current and potential transformer. |
| 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 | |
| 7258. |
The scale of dynamometer wattmeter is non linear. |
| A. | True |
| B. | False |
| Answer» C. | |
| 7259. |
Magnetic effect of current is used in |
| A. | ammeters |
| B. | voltmeters |
| C. | wattmeters |
| D. | ammeters, voltmeters, wattmeters and energy meters |
| Answer» E. | |
| 7260. |
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 | |
| 7261. |
A volt ratio box should have low resistance. |
| A. | True |
| B. | False |
| Answer» C. | |
| 7262. |
The coils of Drysdale polar potentiometer are wound non-inductively. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 7263. |
The scale of a dynamometer is linear when used as |
| A. | ammeter |
| B. | voltmeter |
| C. | wattmeter |
| D. | both (a) and (c) |
| Answer» D. both (a) and (c) | |
| 7264. |
Two sinusoidal signals of equal amplitude and frequency are applied to X and Y plate of CRO respectively. The observed Lissajous pattern is a straight line. The phase shift between signals is |
| A. | zero |
| B. | 90 |
| C. | either zero or 180 |
| D. | either 90 or 270 |
| Answer» D. either 90 or 270 | |
| 7265. |
Three phase four wire induction energy meter is used to measure |
| A. | energy in 3 phase balanced star load |
| B. | energy in 3 phase balanced delta load |
| C. | energy in 3 phase unbalanced load |
| D. | either (a) or (b) |
| Answer» D. either (a) or (b) | |
| 7266. |
Thermistors are made of |
| A. | pure metals |
| B. | pure insulators |
| C. | tintered mixture of metallic oxides |
| D. | pure semiconductors |
| Answer» D. pure semiconductors | |
| 7267. |
Assertion (A): Wien bridge can be used for measuring frequency.Reason (R): A frequency meter for 50 Hz system has a frequency range of 40 to 60 Hz. |
| 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 | |
| 7268. |
Electrostatic voltmeter is suitable only for low voltages. |
| A. | True |
| B. | False |
| Answer» C. | |
| 7269. |
A moving iron voltmeter reads 250 V when connected to 250 V dc. If connected to 250 V 50 Hz, the voltmeter reading is likely to be |
| A. | 250 V |
| B. | 252 V |
| C. | 248 V |
| D. | 210 V |
| Answer» D. 210 V | |
| 7270. |
A single element strain gauge bridge has two fixed resistances R1 and R1 of 120 Ω each and a variable resistance which gives full deflection at 120 Ω for zero strain and 120.6 Ω for straine e. If gauge factor is 2, strain e is |
| A. | 0.0025 |
| B. | 0.0035 |
| C. | 0.005 |
| D. | 0.0075 |
| Answer» B. 0.0035 | |
| 7271. |
LVDT is a |
| A. | pressure transducer |
| B. | displacement transducer |
| C. | velocity transducer |
| D. | acceleration transducer |
| Answer» C. velocity transducer | |
| 7272. |
A 0-200 V voltmeter has an accuracy of 0.75% of full scale reading. If voltage measured is 100 V, the error is |
| A. | 3% |
| B. | 2% |
| C. | 1.5% |
| D. | .75% |
| Answer» D. .75% | |
| 7273. |
In Schering bridge, the potential of detector above earth potential is about |
| A. | a few volts |
| B. | 10 kV |
| C. | 1000 V |
| D. | either (a) or (b) |
| Answer» B. 10 kV | |
| 7274. |
Consider the following statements Thermistor is more sensitive than platinum resistance thermometerThe resistance of thermistor is solely a function of its absolute temperature whether the source of heat is external or internalThermistor has linear temperature-resistance relationshipThermistor 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. | |
| 7275. |
A moving coil meter has 10 Ω resistance and requires 40 mA for full scale deflection. The shunt resistance required to convert it into 0-2 A ammeter is |
| A. | 0.1021 Ω |
| B. | 0.2041 Ω |
| C. | 0.256 Ω |
| D. | 0.4210 Ω |
| Answer» C. 0.256 Ω | |
| 7276. |
Which of the following instruments can be used for dc as well ac upto a few MHz? Moving iron instrumentThermocouple instrumentInduction instrumentMoving 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 | |
| 7277. |
Two resistances R1 = 18.7 Ω. and R2 = 3.624 Ω in series. The total resistance to the appropriate number of significant figures is |
| A. | 22.324 Ω |
| B. | 22.32 Ω |
| C. | 22.3 Ω |
| D. | 22 Ω |
| Answer» D. 22 Ω | |
| 7278. |
The input impedance of CRO is about |
| A. | zero |
| B. | 10 Ω |
| C. | 100 Ω |
| D. | one mega ohm |
| Answer» E. | |
| 7279. |
Assertion (A): Strain measurement using strain gauge invariably requires a dummy strain gauge.Reason (R): The resistance of strain gauge depends on temperature. |
| 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 | |
| 7280. |
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 | |
| 7281. |
The wave applied to X plates, for ohtaining trace of voltage wave, is |
| A. | sawtooth wave |
| B. | sinusoidal wave |
| C. | rectangular wave |
| D. | either (a) or (c) |
| Answer» B. sinusoidal wave | |
| 7282. |
The response of a thermistor overs the whole of its temperatures range is |
| A. | linear |
| B. | non-linear |
| C. | almost linear |
| D. | either (a) or (c) |
| Answer» C. almost linear | |
| 7283. |
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% | |
| 7284. |
It is required to study transients during switching process. Which CRO should be preferred? |
| A. | Ordinary CRO |
| B. | Dual beam CRO |
| C. | Dual trace CRO |
| D. | Storage oscilloscope |
| Answer» E. | |
| 7285. |
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 | |
| 7286. |
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 | |
| 7287. |
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 | |
| 7288. |
If the secondary winding of CT is opened when primary coil is carrying current |
| A. | transformer will burn immediately |
| B. | there will be weak flux density in core |
| C. | there will be very high induced voltage in secondary |
| D. | there will be high current in secondary |
| Answer» D. there will be high current in secondary | |
| 7289. |
The power factor of a single phase load can be calculated if instruments available are |
| A. | one voltmeter, one ammeter |
| B. | two ammeters |
| C. | two voltmeters |
| D. | one voltmeter, one ammeter and one wattmeter |
| Answer» E. | |
| 7290. |
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 | |
| 7291. |
The current through the coil of an electromagnet is doubled. The magnetic field around the coil |
| A. | is halved |
| B. | is doubled |
| C. | becomes four times |
| D. | remains the same |
| Answer» C. becomes four times | |
| 7292. |
In a moving iron voltmeter the coil has a resistance of 20 Ω and an inductance of 0.3 H. The swamping resistance in 2000 Ω. To ensure correct reading with dc as well as 50 Hz ac, the value of capacitor to be connected in parallel with swamping resistance should be |
| A. | 0.0125 F |
| B. | 0.0311 F |
| C. | 0.0521 F |
| D. | 0.0622 F |
| Answer» C. 0.0521 F | |
| 7293. |
Insertion of a dielectric material between the plates of an air capacitor |
| A. | increases the capacitance |
| B. | decreases capacitance |
| C. | has no effect an capacitance |
| D. | increases breakdown voltage |
| Answer» B. decreases capacitance | |
| 7294. |
Two ammeters A and B are connected in parallel in a circuit carrying 100 A. Their resistances are 0.8 mΩ. Their readings will be. |
| A. | 55.56 and 44.44 A respectively |
| B. | 44.44 A and 55.56 A respectively |
| C. | 60 A and 40 A respectively |
| D. | 40 A and 60 A respectively |
| Answer» B. 44.44 A and 55.56 A respectively | |
| 7295. |
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 | |
| 7296. |
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 | |
| 7297. |
Assertion (A): A universal RLC bridge has a battery and also a high frequency ac source.Reason (R): RLC bridge uses a Wienbridge arrangement for measuring 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 | |
| 7298. |
Consider the following features of an instrument suitable for both ac and dcfree from hysteresis and eddy current errorsNo waveform and frequency errorsit is essentially a voltmeter This instrument is |
| A. | moving iron |
| B. | moving coil |
| C. | electrostatic |
| D. | dynamometer |
| Answer» D. dynamometer | |
| 7299. |
Which one of the following effects is used in measuring power? |
| A. | Seeback |
| B. | Ferrari |
| C. | Induction |
| D. | Hall |
| Answer» D. Hall | |
| 7300. |
The effect of lead resistance is important in measurement of |
| A. | resistance of shunt |
| B. | resistance of shunt winding |
| C. | resistance of ammeter |
| D. | both (a) and (c) |
| Answer» E. | |