MCQOPTIONS
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MCQOPTIONS
This section includes 134 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
The objective of earthing or grounding is: |
| A. | to provide as low resistance possible to the ground |
| B. | to provide as high resistance possible to the ground |
| C. | to provide flow of positive, negative and zero sequence currents |
| D. | none of the above |
| Answer» B. to provide as high resistance possible to the ground | |
| 52. |
A 1000:5 C.T. is used with an ammeter. If ammeter reading is 1.8 A then theactual line current is --------------A |
| A. | 160 |
| B. | 400 |
| C. | 0.09 |
| D. | 360 |
| Answer» E. | |
| 53. |
A Dynamometer type wattmeter responds to the: |
| A. | average value of the active power |
| B. | average value of the reactive power |
| C. | peak value of the active power |
| D. | peak value of the reactive power |
| Answer» B. average value of the reactive power | |
| 54. |
In an electro dynamometer type of wattmeter , the inductance of the pressurecoil circuit produces error : |
| A. | which is constant irrespective of the power factor of the load |
| B. | which is higher at low power factors |
| C. | which is lower at low power factors |
| D. | none of the above. |
| Answer» C. which is lower at low power factors | |
| 55. |
Generally grounding is provided for: |
| A. | only for the safety of the equipment |
| B. | only for the safety of the operating personnel |
| C. | both (a) and (b) |
| D. | none of the above |
| Answer» D. none of the above | |
| 56. |
Which of the following devices should be used for accurate measurementof low D.C. voltage ? |
| A. | small range moving coil voltmeter |
| B. | d.c. potentiometer |
| C. | small range thermocouple voltmeter |
| D. | none of the above |
| Answer» C. small range thermocouple voltmeter | |
| 57. |
Which of the following essential features is possessed by an indicatinginstrument ? |
| A. | deflecting device |
| B. | controlling device |
| C. | damping device |
| D. | all of the above |
| Answer» E. | |
| 58. |
LVDT used for measurement of |
| A. | temperature |
| B. | displacement measurement |
| C. | resistance |
| D. | voltage |
| Answer» C. resistance | |
| 59. |
While testing cables the galvanometer used should be initially short-circuitedin order to protect it from sudden initial inrush currents as the cable have: |
| A. | a low value of initial resistance |
| B. | a low value of initial capacitance |
| C. | a high value of initial capacitance |
| D. | both (a) and (b) |
| Answer» D. both (a) and (b) | |
| 60. |
Which of the following bridge is frequency sensitive: |
| A. | wheatstone bridge |
| B. | maxwell bridge |
| C. | anderson bridge |
| D. | wien bridge |
| Answer» D. wien bridge | |
| 61. |
Maxwell’s inductance capacitance bridge is used for measurement ofinductance of: |
| A. | low q coils |
| B. | medium q coils |
| C. | low and medium q coils |
| D. | none of the above. |
| Answer» C. low and medium q coils | |
| 62. |
The power in 3ph 4 wire circuit can be measured by using: |
| A. | five watt meters |
| B. | four watt meters |
| C. | three watt meters |
| D. | 1 watt meter. |
| Answer» D. 1 watt meter. | |
| 63. |
Anderson bridge is used to measure of: |
| A. | inductance |
| B. | capacitance |
| C. | time period |
| D. | resistance and capacitance |
| Answer» B. capacitance | |
| 64. |
The braking torque provided by a permanent magnet in a single phase energymeter is proportional to the |
| A. | square of the flux of the permanent magnet |
| B. | speed of the meter |
| C. | distance of the permanent magnet from the centre of the revolving disc |
| D. | all of the above. |
| Answer» E. | |
| 65. |
The resistance in the circuit of the moving coil of a dynamometer wattmetershould be |
| A. | almost zero |
| B. | low |
| C. | high |
| D. | none of the above |
| Answer» D. none of the above | |
| 66. |
A 3810/63 P.T. is used with a voltmeter gives reading of 28.11 V , then theactual line voltage is ------ V |
| A. | 0.4648 |
| B. | 975 |
| C. | 1700 |
| D. | 1100 |
| Answer» D. 1100 | |
| 67. |
Temperature transducers make use of |
| A. | change in resistivity |
| B. | change in length |
| C. | change in area |
| D. | change in capacitance |
| Answer» B. change in length | |
| 68. |
The turns ratio for C.T. is defined as |
| A. | n2/n1 |
| B. | n1/n2 |
| C. | (n1+n2)/n1 |
| D. | (n1+n2)/n2 |
| Answer» B. n1/n2 | |
| 69. |
The change in the direction of a compass needle, when a current carrying wireis brought near, is called |
| A. | . electromagnetic deflection |
| B. | . electroscopic force |
| C. | magnetic force |
| D. | . electrostatic force |
| Answer» B. . electroscopic force | |
| 70. |
Strain gauge measurement involves |
| A. | wheatstone bridge |
| B. | kelvin bridge |
| C. | de sauty’s bridge |
| D. | anderson bridge |
| Answer» B. kelvin bridge | |
| 71. |
A bridge circuit works at a frequency of 2KHz, the following can be used asdetectors for detection of null conditions in the bridge: |
| A. | vibration galvanometers and headphones |
| B. | headphones and tunable amplifiers. |
| C. | vibration galvanometers and tunable amplifiers. |
| D. | vibration galvanometers, headphones and tunable amplifiers. |
| Answer» C. vibration galvanometers and tunable amplifiers. | |
| 72. |
Strain gauge used for measurement of |
| A. | temperature |
| B. | resistance |
| C. | inductance |
| D. | displacement |
| Answer» E. | |
| 73. |
The ratio of maximum displacement deviation to full scale deviation of theinstrument is called |
| A. | static sensitivity |
| B. | dynamic deviation |
| C. | linearity |
| D. | precision or accuracy |
| Answer» D. precision or accuracy | |
| 74. |
In electro dynamometer type of wattmeter current coils designed for carryingheavy currents use stranded wires or laminated conductors : |
| A. | to reduce iron losses |
| B. | to reduce hysteresis losses |
| C. | to reduce eddy current losses in the conductors |
| D. | all of the above. |
| Answer» D. all of the above. | |
| 75. |
Swamping of resistance is used to compensate errordue to: |
| A. | stray magnetic field |
| B. | temperature variations |
| C. | large supply variations |
| D. | none of the above |
| Answer» C. large supply variations | |
| 76. |
High resistances are provided with a guard terminal. This guard terminal isused to : |
| A. | bypass leakage current |
| B. | guard the resistance against stray electrostatic fields |
| C. | guard the resistance against over loads. |
| D. | none of the above. |
| Answer» B. guard the resistance against stray electrostatic fields | |
| 77. |
The most commonly used null deflector in a powerfrequency ac bridge is a |
| A. | vibration galvanometer |
| B. | d\arsanval galvanometer |
| C. | ballistic galvanometer |
| D. | tachometer |
| Answer» B. d\arsanval galvanometer | |
| 78. |
--------- is an instrument which measures the insulation resistance of anelectric circuit relative to earth and one another, |
| A. | tangent galvanometer |
| B. | meggar |
| C. | current transformer |
| D. | none of the above |
| Answer» C. current transformer | |
| 79. |
The pressure coil of an induction type energy meter is |
| A. | highly inductive |
| B. | highly resistive |
| C. | purely inductive |
| D. | purely resistive |
| Answer» B. highly resistive | |
| 80. |
The power measurement in a balanced 3-phase circuit can be done by: |
| A. | one wattmeter method |
| B. | two wattmeter method |
| C. | three wattmeter method |
| D. | any of the above method |
| Answer» E. | |
| 81. |
In a dynamometer 3-phase power factor meter, the planes of the twomoving coils are at |
| A. | 0° |
| B. | 60° |
| C. | 90° |
| D. | 120° |
| Answer» E. | |
| 82. |
In an energymeter braking torque is produced to |
| A. | safe guard it against creep |
| B. | brake the instrument |
| C. | bring energy meter to stand still |
| D. | maintain steady speed and equal to driving torque |
| Answer» E. | |
| 83. |
Electrical transducers generate |
| A. | biological signals |
| B. | chemical signals |
| C. | physical signals |
| D. | electrical signals |
| Answer» E. | |
| 84. |
The power factor of a single phase load can be calculated if theinstruments available are |
| A. | one voltmeter and one ammeter |
| B. | one voltmeter, one ammetqr and one wattmeter |
| C. | one voltmeter, one ammeter and one energy meter |
| D. | any of the above |
| Answer» C. one voltmeter, one ammeter and one energy meter | |
| 85. |
In an Induction type energy meter, maximum torque is obtained when theparameter of the rotating disc are |
| A. | r=0 |
| B. | x=0 |
| C. | r=x |
| D. | none of the above |
| Answer» C. r=x | |
| 86. |
The gravity controlled instrument has crowded scale because current isproportional to |
| A. | balancing weight |
| B. | deflection angle |
| C. | sine of deflection angle |
| D. | none of the above |
| Answer» D. none of the above | |
| 87. |
If the current in a capacitor leads the voltage by 80°, the loss angle of thecapacitor is |
| A. | 10° |
| B. | 80° |
| C. | 120° |
| D. | 170° |
| Answer» B. 80° | |
| 88. |
Megger is an instrument used for the measurement of: |
| A. | high resistance and insulation resistance |
| B. | medium resistance |
| C. | low resistance |
| D. | leakage current |
| Answer» B. medium resistance | |
| 89. |
Electrical strain gauge works on the principle of |
| A. | variation of resistance |
| B. | variation of capacitance |
| C. | variation of inductance |
| D. | variation of area |
| Answer» B. variation of capacitance | |
| 90. |
An Induction meter meter can handle current upto |
| A. | 10a |
| B. | 30a |
| C. | 200a |
| D. | 100a |
| Answer» E. | |
| 91. |
In ultrasonic level gauge, the ultrasonic source is placed at the |
| A. | bottom of the vessel containing the liquid |
| B. | top of the vessel containing the liquid |
| C. | middle of the vessel containing the liquid |
| D. | far from the vessel containing the liquid |
| Answer» B. top of the vessel containing the liquid | |
| 92. |
The use of _____ instruments is merely confined within laboratories asstandardizing instruments. |
| A. | absolute |
| B. | indicating |
| C. | recording |
| D. | integrating |
| Answer» B. indicating | |
| 93. |
Average resistance of human body is: |
| A. | 500 ohms |
| B. | 1000 ohms |
| C. | 1500 ohms |
| D. | 2000 ohms |
| Answer» C. 1500 ohms | |
| 94. |
A moving iron ammeter coil has few turns of thickwire in order to have: |
| A. | high sensitivity |
| B. | effective damping |
| C. | low resistance and large current carrying capacity |
| D. | large scale |
| Answer» D. large scale | |
| 95. |
How do passive transducers develop electrical signals |
| A. | using a transformer |
| B. | using internal source |
| C. | using external source |
| D. | using a diode |
| Answer» D. using a diode | |
| 96. |
Potentiometer is an __ instrument: |
| A. | indicating |
| B. | comparison |
| C. | calibrating |
| D. | recording |
| Answer» C. calibrating | |
| 97. |
A transducer must be |
| A. | quick in response |
| B. | slow in response |
| C. | medium in response |
| D. | very slow in response |
| Answer» B. slow in response | |
| 98. |
Which of the following is an essential part of a induction type of meter ? |
| A. | an operating torque system |
| B. | a braking device |
| C. | revolution registering device |
| D. | all of the above |
| Answer» E. | |
| 99. |
Which of the following devices may be used for extending the range ofinstruments ? |
| A. | shunts |
| B. | multipliers |
| C. | current transformers |
| D. | all of the above |
| Answer» E. | |
| 100. |
For handling greater currents induction wattmeters are used inconjunction with |
| A. | potential transformers |
| B. | current transformers |
| C. | power transformers |
| D. | either of the above |
| Answer» C. power transformers | |