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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.
| 7151. |
In a low power factor wattmeter, the resistance of pressure coil is more than in ordinary wattmeter. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 7152. |
If two time varying signals of equal magnitude and zero phase displacement are applied to X and Y plates respectively; of CRO, the display will be |
| A. | a straight line |
| B. | a circle |
| C. | an ellipse |
| D. | a square |
| Answer» B. a circle | |
| 7153. |
Wagner earthing device is used to eliminate error due to |
| A. | electromagnetic coupling |
| B. | electrostatic coupling |
| C. | both electrostatic and electromagnetic coupling |
| D. | either (a) or (b) |
| Answer» C. both electrostatic and electromagnetic coupling | |
| 7154. |
The moving iron instruments are generally repulsion type. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 7155. |
Gauge factor of a strain gauge is |
| A. | unit change in resistance per unit change in length |
| B. | change in resistance per unit change in length |
| C. | unit change in length per unit change in resistance |
| D. | none of the above |
| Answer» B. change in resistance per unit change in length | |
| 7156. |
The total insulation resistance consists of insulation volume resistance and surface leakage resistance. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 7157. |
Assertion (A): Capacitance effect can be used to measure thickness of sheets, displacement and pressure.Reason (R): Capacitance between two plates depends on the area of plates, distance between plates and permittivity of medium. |
| 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 | |
| 7158. |
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 | |
| 7159. |
In a current transformers |
| A. | the number of turns in primary and secondary windings are nearly equal |
| B. | the number of primary turns is very small as compared to number of secondary turns. |
| C. | the number of secondary turns is very small as compared to the number of primary turns |
| D. | either (a) or (c). |
| Answer» C. the number of secondary turns is very small as compared to the number of primary turns | |
| 7160. |
A dynamometer wattmeter can be used for |
| A. | dc only |
| B. | ac only |
| C. | dc and 50 Hz ac |
| D. | dc and high frequency ac |
| Answer» D. dc and high frequency ac | |
| 7161. |
The time base of a high frequency CRO whose screen diameter is 10 cm is set at 10 sec/cm. The lowest frequency which can be fully displayed on the screen is |
| A. | more than 100 kHz |
| B. | equal to 100 kHz |
| C. | equal to 10 kHz |
| D. | less than 10 kHz |
| Answer» D. less than 10 kHz | |
| 7162. |
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 | |
| 7163. |
The accuracy of a multimeter is about |
| A. | 0.5% |
| B. | 3% |
| C. | 0.01% |
| D. | 10% |
| Answer» C. 0.01% | |
| 7164. |
Eddy currents are essential for the deflecting torque of an induction wattmeter. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 7165. |
To measure moisture in wood, the most suitable method is |
| A. | electric conduction |
| B. | electrical-capacitive |
| C. | absorption of radiation |
| D. | equilibrium-moisture Vs humidity |
| Answer» B. electrical-capacitive | |
| 7166. |
An E transformer is a |
| A. | displacement transducer |
| B. | velocity transducer |
| C. | acceleration transducer |
| D. | pressure transducer |
| Answer» B. velocity transducer | |
| 7167. |
Load cell uses |
| A. | piezoelectric crystal |
| B. | capacitor |
| C. | mutual inductance |
| D. | strain gauge |
| Answer» E. | |
| 7168. |
Piezoelectric effect can be used to measure |
| A. | force |
| B. | strain |
| C. | acceleration |
| D. | all of the above |
| Answer» E. | |
| 7169. |
A current of 3.18 A is flowing through resistance of 35.68 Ω. The voltage drop across resistance to the appropriate number of significant figures is |
| A. | 113.4624 V |
| B. | 113.462 V |
| C. | 113.46 V |
| D. | 113 V |
| Answer» E. | |
| 7170. |
Assertion (A): A dc potentiometer measures the true open circuit emf of a source.Reason (R): At balance point, a dc potentiometer does not draw any current from the source. |
| 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 | |
| 7171. |
The resistance of series field winding is a low resistance. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 7172. |
Assertion (A): In two wattmeter method of 3 phase power measurement, one of the wattmeters would read negative if power factor of load is less than 0.5.Reason (R): In two wattmeter method of 3 phase power measurement, both the wattmeters would show equal readings if power factor of load is unity. |
| 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 | |
| 7173. |
In a megger the moving coil meter has a permanent magnet. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 7174. |
The pointer of an indicating instrument should be |
| A. | very light |
| B. | very heavy |
| C. | neither heavy nor light |
| D. | heavy |
| Answer» B. very heavy | |
| 7175. |
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 | |
| 7176. |
The most serious problems in ac bridge measurement is |
| A. | eddy currents |
| B. | leakage current |
| C. | residual magnetism |
| D. | stray fields |
| Answer» E. | |
| 7177. |
Assertion (A): An electrostatic voltmeter is free from hysteresis and eddy current errors.Reason (R): An electrostatic voltmeter has a number of fixed and moving vanes in parallel. |
| 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 | |
| 7178. |
In order to achieve accuracy, the slide wire of a potentiometer should be |
| A. | as long as possible |
| B. | as short as possible |
| C. | neither too long nor too short |
| D. | very thin |
| Answer» B. as short as possible | |
| 7179. |
In measuring resistance using voltmeter and ammeter, the resistances of voltmeter and ammeter also affect the accuracy of measurement. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 7180. |
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 | |
| 7181. |
In an ac coordinate potentiometer, the currents inphase and quadrature potentiometer are adjusted to be |
| A. | out of phase by 90 |
| B. | in phase |
| C. | out of phase by 45 |
| D. | out of phase 180 |
| Answer» B. in phase | |
| 7182. |
Schering bridge operates at a high voltage of about 10 kV. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 7183. |
In a platinum RTD, the change in resistance for a temperature rise of 50 C is about |
| A. | 2% |
| B. | 10% |
| C. | 20% |
| D. | 40% |
| Answer» D. 40% | |
| 7184. |
The switch board instruments |
| A. | should be mounted in vertical position |
| B. | should be mounted in horizontal position |
| C. | should be mounted at about 45 |
| D. | should be mounted at about 80 |
| Answer» B. should be mounted in horizontal position | |
| 7185. |
Pirani gauge is used to measure |
| A. | very low pressure |
| B. | high pressure |
| C. | pressure in the range of 1 atmosphere |
| D. | fluid flow |
| Answer» B. high pressure | |
| 7186. |
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 | |
| 7187. |
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 | |
| 7188. |
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 | |
| 7189. |
Shaft encoder is used to measure |
| A. | angular position |
| B. | linear position |
| C. | linear velocity |
| D. | linear acceleration |
| Answer» B. linear position | |
| 7190. |
Assertion (A): Moving iron instrument can be used on ac or dc.Reason (R): In a moving iron instrument deflecting torque is proportional to square of current. |
| 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 | |
| 7191. |
Assertion (A): The scale a PMMC ammeter is linear.Reason (R): The deflecting torque of PMMC is proportional to current in the coil. |
| 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 | |
| 7192. |
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 | |
| 7193. |
The device having highest photo sensitivity is |
| A. | photoconductive cell |
| B. | photovoltaic cell |
| C. | photodiode |
| D. | phototransistor |
| Answer» B. photovoltaic cell | |
| 7194. |
Use of high permeability core in moving iron instrument helps in |
| A. | reducing size of meter |
| B. | increasing sensitivity |
| C. | reducing temperature error |
| D. | all of the above |
| Answer» C. reducing temperature error | |
| 7195. |
The two pressure coils in a single phase power factor meter of turns |
| A. | the same dimension and the same numbers of turns |
| B. | the same dimension but different number of turns |
| C. | different dimension and different numbers of turns |
| D. | different dimension but the same numbers of turns |
| Answer» B. the same dimension but different number of turns | |
| 7196. |
For use at 50 Hz the range of scale of vibrating reed frequency meter is |
| A. | 25 - 75 Hz |
| B. | 40 - 60 Hz |
| C. | 47 - 53 Hz |
| D. | 42 - 58 Hz |
| Answer» D. 42 - 58 Hz | |
| 7197. |
Consider the following statements about a moving iron instrument It is an unpolarised instrument.It has permanent magnet.It has a fixed coil.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 | |
| 7198. |
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 | |
| 7199. |
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 | |
| 7200. |
In portable instruments, damping is provided by |
| A. | spring |
| B. | gravity |
| C. | eddy current |
| D. | either (a) or (c) |
| Answer» B. gravity | |