MCQOPTIONS
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MCQOPTIONS
This section includes 135 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. |
Heavy duty cranes are used in~! |
| A. | Ore handling plants |
| B. | Steel plants |
| C. | Heavy engineering workshops |
| D. | All of the above |
| Answer» E. | |
| 52. |
Which of the following types of motor enclosure is safest?%! |
| A. | Totally enclosed |
| B. | Totally enclosed fan cooled |
| C. | Open type |
| D. | Semi closed |
| Answer» C. Open type | |
| 53. |
Reluctance motor is a%! |
| A. | Variable torque motor |
| B. | Low torque variable speed motor |
| C. | Self starting type synchronous motor |
| D. | Low noise, slow speed motor |
| Answer» D. Low noise, slow speed motor | |
| 54. |
Short time rated motors are preferred for overhead traveling cranes%! |
| A. | True |
| B. | False |
| Answer» B. False | |
| 55. |
Which of the following is essentially needed while selecting a motor?%! |
| A. | Pulley |
| B. | Starter |
| C. | Foundation pedal |
| D. | Bearings |
| Answer» C. Foundation pedal | |
| 56. |
By the use of which of the following D.C. can be obtained from AC.?%! |
| A. | Silicon diodes |
| B. | Mercury arc rectifier |
| C. | Motor generator set |
| D. | Any of the above |
| Answer» E. | |
| 57. |
Belted slip ring induction motor is almost invariably used for%! |
| A. | Water pumps |
| B. | Jaw crushers |
| C. | Centrifugal blowers |
| D. | None of the above |
| Answer» C. Centrifugal blowers | |
| 58. |
Which of the following motors are preferred for overhead traveling cranes?%! |
| A. | Slow speed motors |
| B. | Continuous duty motors |
| C. | Short time rated motors |
| D. | None of the above |
| Answer» D. None of the above | |
| 59. |
________ need frequent starting and stopping of electric motors,%! |
| A. | Paper mills |
| B. | Grinding mills |
| C. | Air-conditioners |
| D. | Lifts and hoists |
| Answer» E. | |
| 60. |
A pony motor is used for the starting which of the following motors?%! |
| A. | Squirrel cage induction motor |
| B. | Schrage motor |
| C. | Synchronous motor |
| D. | None of the above |
| Answer» D. None of the above | |
| 61. |
In series motor which of the following methods can be used for changing the flux per pole?%! |
| A. | Tapped field control |
| B. | Diverter field control |
| C. | Series-parallel control |
| D. | Any of the above |
| Answer» E. | |
| 62. |
The selection of an electric motor for any application depends on which of the following factors?%! |
| A. | Electrical characteristics |
| B. | Mechanical characteristics |
| C. | Size and rating of motors |
| D. | All of the above |
| Answer» E. | |
| 63. |
The starting torque of a D.C. motor is independent of which of the following?%! |
| A. | Flux |
| B. | Armature current |
| C. | Flux and armature current |
| D. | Speed |
| Answer» E. | |
| 64. |
The starting torque in case of centrifugal pumps is generally%! |
| A. | Less than running torque |
| B. | Same as running torque |
| C. | Slightly more than running torque |
| D. | Double the running torque |
| Answer» B. Same as running torque | |
| 65. |
The capacity of a crane is expressed in terms of%! |
| A. | Type of drive |
| B. | Span |
| C. | Tonnes |
| D. | Any of the above |
| Answer» D. Any of the above | |
| 66. |
Is preferred for synthetic fibre mills.%! |
| A. | Synchronous motor |
| B. | Reluctance motor |
| C. | Series motor |
| D. | Shunt motor |
| Answer» C. Series motor | |
| 67. |
In ________ the speed can be varied by changing the position of brushes.%! |
| A. | Slip ring motor |
| B. | Schrage motor |
| C. | Induction motor |
| D. | Repulsion motor |
| Answer» C. Induction motor | |
| 68. |
For a motor-generator set which of the following motors will be preferred?%! |
| A. | Synchronous motor |
| B. | Slip ring induction motor |
| C. | Pole changing induction motor |
| D. | Squirrel cage induction motor |
| Answer» B. Slip ring induction motor | |
| 69. |
The cost of an induction motor will increase as%! |
| A. | Horsepower rating increases but r.p.m. decreases |
| B. | Horsepower rating decreases but r.p.m. increases |
| C. | Horsepower rating and operating speed increases |
| D. | Horsepower rating and operating speed decreases |
| Answer» B. Horsepower rating decreases but r.p.m. increases | |
| 70. |
*$_The cost of an induction motor will increase as? |
| A. | Horsepower rating increases but r.p.m. decreases |
| B. | Horsepower rating decreases but r.p.m. increases |
| C. | Horsepower rating and operating speed increases |
| D. | Horsepower rating and operating speed decreases |
| Answer» B. Horsepower rating decreases but r.p.m. increases | |
| 71. |
*$_For a motor-generator set which of the following motors will be preferred?? |
| A. | Synchronous motor |
| B. | Slip ring induction motor |
| C. | Pole changing induction motor |
| D. | Squirrel cage induction motor |
| Answer» B. Slip ring induction motor | |
| 72. |
*$_In ________ the speed can be varied by changing the position of brushes.? |
| A. | Slip ring motor |
| B. | Schrage motor |
| C. | Induction motor |
| D. | Repulsion motor |
| Answer» C. Induction motor | |
| 73. |
*$_Is preferred for synthetic fibre mills.? |
| A. | Synchronous motor |
| B. | Reluctance motor |
| C. | Series motor |
| D. | Shunt motor |
| Answer» C. Series motor | |
| 74. |
*$_The capacity of a crane is expressed in terms of? |
| A. | Type of drive |
| B. | Span |
| C. | Tonnes |
| D. | Any of the above |
| Answer» D. Any of the above | |
| 75. |
*/*_The selection of an electric motor for any application depends on which of the following factors?? |
| A. | Electrical characteristics |
| B. | Mechanical characteristics |
| C. | Size and rating of motors |
| D. | All of the above |
| Answer» E. | |
| 76. |
*/*_The starting torque of a D.C. motor is independent of which of the following?? |
| A. | Flux |
| B. | Armature current |
| C. | Flux and armature current |
| D. | Speed |
| Answer» E. | |
| 77. |
*/*_Which of the following motors are preferred for overhead traveling cranes?? |
| A. | Slow speed motors |
| B. | Continuous duty motors |
| C. | Short time rated motors |
| D. | None of the above |
| Answer» D. None of the above | |
| 78. |
*/*_________ need frequent starting and stopping of electric motors,? |
| A. | Paper mills |
| B. | Grinding mills |
| C. | Air-conditioners |
| D. | Lifts and hoists |
| Answer» E. | |
| 79. |
*/*_The starting torque in case of centrifugal pumps is generally? |
| A. | Less than running torque |
| B. | Same as running torque |
| C. | Slightly more than running torque |
| D. | Double the running torque |
| Answer» B. Same as running torque | |
| 80. |
*/*_A pony motor is used for the starting which of the following motors?? |
| A. | Squirrel cage induction motor |
| B. | Schrage motor |
| C. | Synchronous motor |
| D. | None of the above |
| Answer» D. None of the above | |
| 81. |
*/*_In series motor which of the following methods can be used for changing the flux per pole?? |
| A. | Tapped field control |
| B. | Diverter field control |
| C. | Series-parallel control |
| D. | Any of the above |
| Answer» E. | |
| 82. |
*/*_Belted slip ring induction motor is almost invariably used for? |
| A. | Water pumps |
| B. | Jaw crushers |
| C. | Centrifugal blowers |
| D. | None of the above |
| Answer» C. Centrifugal blowers | |
| 83. |
%_A reluctance motor_% |
| A. | Is provided with slip rings |
| B. | Requires starting gear |
| C. | Has high cost |
| D. | Is compact |
| Answer» E. | |
| 84. |
%_In squirrel cage induction motors which of the following methods of starting cannot be used?_% |
| A. | Resistance in rotor circuit |
| B. | Resistance in stator circuit |
| C. | Autotransformer starting |
| D. | Star-delta starting |
| Answer» B. Resistance in stator circuit | |
| 85. |
%_For crane travel which of the following motors is normally used?_% |
| A. | Synchronous motor |
| B. | D.C. differentially compound motor |
| C. | Ward-Leonard controlled D.C. shunt motor |
| D. | AC. slip ring motor |
| Answer» E. | |
| 86. |
%_Is preferred for automatic drives._% |
| A. | Squirrel cage induction motor |
| B. | Synchronous motors |
| C. | Ward Leonard controlled D.C. motors |
| D. | Any of the above |
| Answer» D. Any of the above | |
| 87. |
%_In a paper mill where constant speed is required_% |
| A. | Synchronous motors are preferred |
| B. | A.C. motors are preferred |
| C. | Individual drive is preferred |
| D. | Group drive is preferred |
| Answer» D. Group drive is preferred | |
| 88. |
%_The size of an excavator is usually expressed in terms of_% |
| A. | "Crowd" motion |
| B. | Angle of swing |
| C. | Cubic meters |
| D. | Travel in meters |
| Answer» D. Travel in meters | |
| 89. |
_ Which of the following motors is preferred when smooth and precise speed control over a wide range is desired?$? |
| A. | D.C. motor |
| B. | Squirrel cage induction motor |
| C. | Wound rotor induction motor |
| D. | Synchronous motor |
| Answer» B. Squirrel cage induction motor | |
| 90. |
_ The characteristics of drive for crane hoisting and lowering are which of the following?$? |
| A. | Precise control |
| B. | Smooth movement |
| C. | Fast speed control |
| D. | All of the above |
| Answer» E. | |
| 91. |
_ A reluctance motor$? |
| A. | Is provided with slip rings |
| B. | Requires starting gear |
| C. | Has high cost |
| D. | Is compact |
| Answer» E. | |
| 92. |
_ For blowers which of the following motor is preferred?$? |
| A. | D.C. series motor |
| B. | D.C. shunt motor |
| C. | Squirrel cage induction motor |
| D. | Wound rotor induction motor |
| Answer» C. Squirrel cage induction motor | |
| 93. |
_ ________ has the least value of starting torque to full load torque ratio.$? |
| A. | D.C. shunt motor |
| B. | D.C. series motor |
| C. | Squirrel cage induction motor |
| D. | Slip ring induction motor |
| Answer» D. Slip ring induction motor | |
| 94. |
_ For which of the following applications motor has to start with high acceleration?$? |
| A. | Oil expeller |
| B. | Floor mill |
| C. | Lifts and hoists |
| D. | Centrifugal pump |
| Answer» D. Centrifugal pump | |
| 95. |
_ Which of the following machines has heavy fluctuation of load?$? |
| A. | Printing machine |
| B. | Punching machine |
| C. | Planer |
| D. | Lathe |
| Answer» C. Planer | |
| 96. |
_ Which of the following motors is preferred for traction work?$? |
| A. | Universal motor |
| B. | D.C. series motor |
| C. | Synchronous motor |
| D. | Three-phase induction motor |
| Answer» B. D.C. series motor | |
| 97. |
__Battery operated scooter for braking uses__ |
| A. | Plugging |
| B. | Mechanical braking |
| C. | Regenerative braking |
| D. | Rheostatic braking |
| Answer» C. Regenerative braking | |
| 98. |
__Which of the following motors is usually preferred for kiln drives?__ |
| A. | Cascade controlled A.C. motor |
| B. | Slip ring induction motor |
| C. | Three phase shunt wound commutator motor |
| D. | Any of the above |
| Answer» E. | |
| 99. |
____________ motor is a constant speed motor.__ |
| A. | Synchronous motor |
| B. | Schrage motor |
| C. | Induction motor |
| D. | Universal motor |
| Answer» B. Schrage motor | |
| 100. |
____________ method of starting a three phase induction motor needs six terminals.__ |
| A. | Star-delta |
| B. | Resistance starting |
| C. | Autotransformer |
| D. | None of the above |
| Answer» B. Resistance starting | |