MCQOPTIONS
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MCQOPTIONS
This section includes 120 Mcqs, each offering curated multiple-choice questions to sharpen your ENGINEERING SERVICES EXAMINATION (ESE) knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
In Separately Excited Generator, the field windings are connected in: |
| A. | close circuit |
| B. | Series with source |
| C. | open circuit |
| D. | Shunt with source |
| Answer» C. open circuit | |
| 52. |
For what purpose synchronous condenser is used in a synchronous motor? |
| A. | Improve the power factor |
| B. | Reduce the power factor |
| C. | Maintain constant power factor |
| D. | Improve efficiency |
| Answer» B. Reduce the power factor | |
| 53. |
Identify the Transformer winding conversion used for consumer distribution from the given options. |
| A. | Star to Delta |
| B. | Delta to Delta |
| C. | Star to Star |
| D. | Delta to Star |
| Answer» E. | |
| 54. |
A transformer has 2% resistance and 5% reactance. What is its voltage regulation at full load with 0.8 p.f. lagging? |
| A. | 5.3% |
| B. | 4.6% |
| C. | 0.53% |
| D. | 0.46% |
| Answer» C. 0.53% | |
| 55. |
Constant loss in a three-phase induction motor is determined by: |
| A. | Two wattmeter test |
| B. | Load test |
| C. | Physical test |
| D. | No load test |
| Answer» E. | |
| 56. |
A three-phase star configuration motor has: |
| A. | 4 hot wires and 1 neutral wire |
| B. | 3 hot wires and 1 ground wire |
| C. | 3 hot wires , 1 neutral and 1 ground wires |
| D. | 3 hot wires and 1 neutral wire |
| Answer» D. 3 hot wires and 1 neutral wire | |
| 57. |
An alternator provides maximum power when the load angle is: |
| A. | 180° |
| B. | 90° |
| C. | 120° |
| D. | 45° |
| Answer» C. 120° | |
| 58. |
In a delta to star connection of transformer one of the following is true |
| A. | used for large HV transformers |
| B. | Used for applications where voltages need to be stepped down |
| C. | line voltage is equal to phase voltage |
| D. | Used for applications where voltages need to be stepped up |
| Answer» E. | |
| 59. |
In an ideal transformer, the no-load primary current: |
| A. | is in phase with VP |
| B. | Lags behind VP by 90° |
| C. | Leads VP by 90° |
| D. | Lags VP by an angle lying between 0° and 90° |
| Answer» C. Leads VP by 90° | |
| 60. |
During installation of a generator, one must carefully ensure that the generator terminals and all control wirings are correct so that the order of __________ matches the system. |
| A. | Frequency sequence |
| B. | Phase sequence |
| C. | Amplitude sequence |
| D. | Power sequence |
| Answer» C. Amplitude sequence | |
| 61. |
How many types of DC motor starters? |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 1 |
| Answer» C. 4 | |
| 62. |
At lagging loads armature reaction in an alternator is |
| A. | Cross magnetising |
| B. | Demagnetising |
| C. | No effective |
| D. | Magnetising |
| Answer» C. No effective | |
| 63. |
In a power transformer, the winding nearer to the iron core |
| A. | Is a high voltage winding |
| B. | Is a low voltage winding |
| C. | May be low or high voltage winding |
| D. | The two types of windings are placed in a sandwich manner. |
| Answer» C. May be low or high voltage winding | |
| 64. |
If the armature of a DC motor has 39 slots with 12 conductors per slot. Then the total number of conductors are __________. |
| A. | 27 |
| B. | 468 |
| C. | 568 |
| D. | 51 |
| Answer» C. 568 | |
| 65. |
In a squirrel cage motor: |
| A. | The end rings and the rotor conducting bars are permanently short-circuited |
| B. | There is a series of induction motor |
| C. | The end-rings are open circuited |
| D. | The rotor conducting bars are made of carbon |
| Answer» B. There is a series of induction motor | |
| 66. |
If a 4 – pole induction motor has synchronous speed of 1500 r.p.m., then supply frequency will be |
| A. | 25 Hz |
| B. | 60 Hz |
| C. | 50 Hz |
| D. | 55 Hz |
| Answer» D. 55 Hz | |
| 67. |
How many diodes are required to build a full wave rectifier from a Centre Tap transformer? |
| A. | 3 |
| B. | 1 |
| C. | 4 |
| D. | 2 |
| Answer» E. | |
| 68. |
High speed protection of DC shunt motor is not provided by: |
| A. | 3 point starter |
| B. | 2 point starter |
| C. | 4 point starter |
| D. | 5 point starter |
| Answer» D. 5 point starter | |
| 69. |
DOL Starter is used for motors having capacity: |
| A. | Less than 5 HP |
| B. | Less than 10 HP |
| C. | Greater than 10 HP |
| D. | Grater than 15 HP |
| Answer» B. Less than 10 HP | |
| 70. |
In a three-phase alternator, there are three windings placed ______ degrees apart. |
| A. | 270 |
| B. | 100 |
| C. | 180 |
| D. | 120 |
| Answer» E. | |
| 71. |
No load speed of which of the following motor will be highest? |
| A. | Shunt motor |
| B. | Series motor |
| C. | Cumulative compound motor |
| D. | Differential compound motor |
| Answer» C. Cumulative compound motor | |
| 72. |
For traction applications, the type of motor best suited is |
| A. | Induction motor |
| B. | Synchronous motor |
| C. | DC shunt motor |
| D. | DC series motor |
| Answer» E. | |
| 73. |
In which of these are the DC motors still preferred for use? |
| A. | Paper industry |
| B. | Steel mill and cranes only |
| C. | Electric excavators only |
| D. | In the electric excavators, steel mills and cranes |
| Answer» E. | |
| 74. |
In a universal motor, normally the ratio of width of brush to the width of commutator segments is: |
| A. | 2 : 1 |
| B. | 1 : 2 |
| C. | 1 : 1 |
| D. | 4 : 1 |
| Answer» B. 1 : 2 | |
| 75. |
Pick the right way to refer to the no load saturation characteristics or magnetic characteristics or Open Circuit characteristics of a DC generator |
| A. | E/Ia |
| B. | E0/If |
| C. | V/I |
| D. | E/I |
| Answer» C. V/I | |
| 76. |
If the field of a DC shunt motor is opened while running, what will happen to the speed? |
| A. | Speed of the motor will remain constant |
| B. | The motor will get locked |
| C. | Speed of the motor will reduce |
| D. | Speed of the motor will become dangerously high |
| Answer» E. | |
| 77. |
Open circuit test is not conducted on a transformer to determine ______ |
| A. | Eddy current loss |
| B. | Copper loss |
| C. | Hysteresis loss |
| D. | Core loss |
| Answer» C. Hysteresis loss | |
| 78. |
For the grid synchronization maximum limit of phase angle is: |
| A. | +/-20° |
| B. | +/-30° |
| C. | +/-25° |
| D. | +/-15° |
| Answer» B. +/-30° | |
| 79. |
Inter pole winding is connected in series with which one of the below? |
| A. | Pole winding |
| B. | Yoke |
| C. | Field winding |
| D. | Armature winding |
| Answer» E. | |
| 80. |
A DC series motor is most suitable for ______. |
| A. | cranes |
| B. | lathes |
| C. | punch presses |
| D. | pump |
| Answer» B. lathes | |
| 81. |
In star delta motor, the starting current is: |
| A. | Reduced approximately by 1/3 times as compared to the original |
| B. | Reduced approximately by 1/4 times as compared to the original |
| C. | Increased approximately by 1/3 times as compared to the original |
| D. | Increased approximately by 14 times as compared to the original |
| Answer» B. Reduced approximately by 1/4 times as compared to the original | |
| 82. |
In a DC generator, the number of poles and the number of armature conductors are fixed. Which of the following windings will give a higher EMF? |
| A. | Depends on other features of the design |
| B. | Field winding |
| C. | Lap Winding |
| D. | Wave Winding |
| Answer» E. | |
| 83. |
In a DC motor back emf is directly proportional to: |
| A. | No. of armature conductors |
| B. | No. of poles |
| C. | Speed |
| D. | Flux |
| Answer» D. Flux | |
| 84. |
For speed control of a DC motor, which technique provides speed above base speed? |
| A. | Field control method |
| B. | Supply current control method |
| C. | Supply voltage control method |
| D. | Armature resistance control method |
| Answer» B. Supply current control method | |
| 85. |
How can the speed of a table fan be controlled? |
| A. | By controlling Frequency |
| B. | By controlling I/P voltage |
| C. | By increasing the frequency. |
| D. | By controlling wave shape |
| Answer» C. By increasing the frequency. | |
| 86. |
A synchronous machine is called a doubly excited machine because |
| A. | It can be over excited |
| B. | It has two sets of rotor poles |
| C. | Both its rotor and stator are excited |
| D. | It needs twice the normal exciting current |
| Answer» D. It needs twice the normal exciting current | |
| 87. |
If a 200 kVA, 2000/200 V transformer has 100 turns in its secondary windings, then the number of turns in its primary are __________. |
| A. | 1000 turns |
| B. | 10 turns |
| C. | 100 turns |
| D. | 10000 turns |
| Answer» B. 10 turns | |
| 88. |
In a 3 – phase motor, the voltage and current measured are as given below.L1 : 230 V, 5 AL2: 230 V, 4.5 AL3: 230 V, 5.5 AWhat’s the input power, assuming power factor of 1? |
| A. | 1,150 Watt |
| B. | 1,265 Watt |
| C. | 1,035 Watt |
| D. | 3,450 Watt |
| Answer» E. | |
| 89. |
A three-point starter is suitable for: |
| A. | Shunt motor |
| B. | Shunt and series motor |
| C. | Compound and series motor |
| D. | Shunt and compound motor |
| Answer» E. | |
| 90. |
How much energy is used by an 80% efficient, 2kW (input) motor running at a peak load for 5 hours? |
| A. | 4 kWh |
| B. | 16 kWh |
| C. | 2 kWh |
| D. | 8 kWh |
| Answer» E. | |
| 91. |
DC motor starter is used to __________. |
| A. | reduce the armature winding resistance |
| B. | control the initial current |
| C. | increase the winding resistance of field |
| D. | reduce the back EMF |
| Answer» C. increase the winding resistance of field | |
| 92. |
In which type of motor a fly wheel is used during heavy loads? |
| A. | DC Series motor |
| B. | AC series motor |
| C. | DC Shunt motor |
| D. | AC shunt motor |
| Answer» D. AC shunt motor | |
| 93. |
Consider two alternators running in parallel. Now if the excitation of the one of the alternators is changed, then: |
| A. | Frequency will change |
| B. | Power factor will change |
| C. | Speed will reduce |
| D. | Load demand will change |
| Answer» C. Speed will reduce | |
| 94. |
Galvanic isolation is provided by which type of transformer? |
| A. | Step-down transformer |
| B. | Center-tap transformer |
| C. | Auto transformer |
| D. | Step-up transformer |
| Answer» D. Step-up transformer | |
| 95. |
For currents as high as 2,000 Amps, which of the following types of fuses is the best choice? |
| A. | LRC Fuse |
| B. | HRC Fuse |
| C. | Nichrome Wire Fuse |
| D. | Glass Cartridge Fuse |
| Answer» C. Nichrome Wire Fuse | |
| 96. |
Abnormal rubbing sound of induction motors can be prevented by: |
| A. | Replacing winding regularly |
| B. | Proper and regular lubrication |
| C. | Cleaning the rotor regularly |
| D. | Regular starter check |
| Answer» C. Cleaning the rotor regularly | |
| 97. |
Alternators are usually designed to generate ________ |
| A. | Variable frequencies |
| B. | Definite frequency |
| C. | Definite current |
| D. | Definite power |
| Answer» C. Definite current | |
| 98. |
If series winding is connected in series with the armature and then the shunt winding is put in parallel to the combination, then such a combination will form which kind of a generator? |
| A. | Long series compound Generator |
| B. | Long shunt compound Generator |
| C. | Long Closet compound Generator |
| D. | Short shunt compound Generator |
| Answer» C. Long Closet compound Generator | |
| 99. |
For a motor to work as a generator: |
| A. | The Rotor should spun Very-fast in Anti-clockwise Direction |
| B. | The rotor must spun faster than its stator’s asynchronous speed |
| C. | The rotor must spun faster than its stator’s synchronous speed |
| D. | The Rotor should spun Very-fast in Clockwise Direction |
| Answer» D. The Rotor should spun Very-fast in Clockwise Direction | |
| 100. |
Routine efficiency of a transformer depends upon the value of |
| A. | Supply frequency |
| B. | Load current |
| C. | Both ( and ( |
| D. | Power factor of load |
| Answer» C. Both ( and ( | |