MCQOPTIONS
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MCQOPTIONS
This section includes 100 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering Questions knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
Nitrogen is added with the argon in an incandescent lamp to |
| A. | Reduce the temperature |
| B. | Reduce the possibility of arcing |
| C. | Increase the brightness |
| D. | Increase the efficiency |
| Answer» C. Increase the brightness | |
| 52. |
Maintenance factor is the ratio of |
| A. | Lumens on the working plane under normal working conditions to the lumens on the working plane under ideal condition |
| B. | Lumens on the working plane under ideal working conditions to the lumens on the working plane under normal condition |
| C. | Lumens falling on the working plane to the lumens emitted by the working plane under ideal condition |
| D. | Lumens emitting by the working plane to the lumens falling on the working plane under ideal condition |
| Answer» B. Lumens on the working plane under ideal working conditions to the lumens on the working plane under normal condition | |
| 53. |
Lux is the unit of |
| A. | Luminous flux |
| B. | Luminous intensity |
| C. | Illumination |
| D. | Luminance |
| Answer» D. Luminance | |
| 54. |
In urban or city train service, the |
| A. | Acceleration period is absent |
| B. | Free running period is absent |
| C. | Coasting period is absent |
| D. | Braking period is absent |
| Answer» C. Coasting period is absent | |
| 55. |
In tramways, |
| A. | Two drum controllers are employed in series |
| B. | Two drum controllers are employed in parallel |
| C. | Only one drum controller is employed |
| D. | Three drum controller are employed either in parallel or series |
| Answer» C. Only one drum controller is employed | |
| 56. |
In speed time curve for trains, the notching period is |
| A. | Constant acceleration period |
| B. | Free running period of the train |
| C. | Braking period of the train |
| D. | Coasting period of the train |
| Answer» B. Free running period of the train | |
| 57. |
In salt bath heating, the current are allowed to flow only through the |
| A. | Only through the salt bath |
| B. | Only through the material being heated |
| C. | Through both (a) and (b) |
| D. | None of these |
| Answer» B. Only through the material being heated | |
| 58. |
In resistance furnaces, the temperature can be controlled by |
| A. | Varying the applied voltage |
| B. | Bucking and boosting secondary voltage |
| C. | Changing the number of heating elements |
| D. | All of these |
| Answer» E. | |
| 59. |
In radiation mode of heat transfer, the heat is transferred from one body to other |
| A. | From molecule to molecule due to the temperature gradient between two parts |
| B. | By actual movement of the heated molecules |
| C. | Without actually heating the medium in between |
| D. | All of these |
| Answer» D. All of these | |
| 60. |
In percussion welding, the heat is produced by a rapid discharge of stored electrical energy from |
| A. | Capacitor |
| B. | Inductor |
| C. | Resistor |
| D. | Transformer |
| Answer» B. Inductor | |
| 61. |
In metal arc welding, the filler material required is |
| A. | Iron |
| B. | Copper |
| C. | Aluminium |
| D. | No filler is required |
| Answer» E. | |
| 62. |
In mail line train services, the |
| A. | Acceleration and braking periods are long |
| B. | Acceleration and braking periods are short |
| C. | Free run and coasting periods are long |
| D. | Both (b) and (c) |
| Answer» E. | |
| 63. |
In internal combustion engine drive, a gear box is |
| A. | Required for controlling the torque |
| B. | Required for controlling the speed |
| C. | Required for controlling both speed and torque |
| D. | Not required |
| Answer» D. Not required | |
| 64. |
In inert gas metal arc welding, |
| A. | Argon is used for welding thin materials and helium is used for welding thick materials |
| B. | Both argon and helium are used for welding thin materials |
| C. | Both argon and helium are used for welding thick materials |
| D. | Argon is used for welding thick materials and helium is used for welding thin materials |
| Answer» B. Both argon and helium are used for welding thin materials | |
| 65. |
In induction heating, the heat produced is |
| A. | Directly proportional to the induced voltage and inversely proportional to the resistance |
| B. | Inversely proportional to the induced voltage and directly proportional to the resistance |
| C. | Directly proportional to the square of induced voltage and inversely proportional to the resistance |
| D. | Inversely proportional to the square of induced voltage and directly proportional to the resistance |
| Answer» D. Inversely proportional to the square of induced voltage and directly proportional to the resistance | |
| 66. |
In indirect core type of furnace, the element is heated by induction, which transfer the heat to the charge by |
| A. | Conduction |
| B. | Radiation |
| C. | Convection |
| D. | All of these |
| Answer» C. Convection | |
| 67. |
In fluorescent lamp one capacitor is connected across the lamp circuit and another is connected across the starter. Then |
| A. | Both the capacitors are used for improving power factor |
| B. | Both the capacitors are used for reducing radio interference |
| C. | Former capacitors is used for improving power factor and later is used for reducing radio interference |
| D. | Former capacitors is used for reducing radio interference and later is used for improving power factor |
| Answer» D. Former capacitors is used for reducing radio interference and later is used for improving power factor | |
| 68. |
In direct core type induction furnaces, the leakage reactance of the magnetic circuit is |
| A. | High and power factor is also high |
| B. | Low and power factor is high |
| C. | High and power factor is low |
| D. | Low and power factor is also low |
| Answer» D. Low and power factor is also low | |
| 69. |
In diesel electric traction, the torque required from traction work must be |
| A. | Directly proportional to the speed |
| B. | Inversely proportional to the speed |
| C. | Independent of the speed |
| D. | Directly proportional to the square of the speed |
| Answer» C. Independent of the speed | |
| 70. |
In diesel electric drive, |
| A. | A diesel engine drives an ac generator |
| B. | Haulage capacity is less |
| C. | Regenerative braking cannot be used |
| D. | All of these |
| Answer» D. All of these | |
| 71. |
In case of dc series motor, the torque can be found from |
| A. | Only magnetization curve |
| B. | Only demagnetization curve |
| C. | Both (a) and (b) |
| D. | None of these |
| Answer» B. Only demagnetization curve | |
| 72. |
In a diesel electric traction, if the current in the traction motor increases then the generator field |
| A. | Demagnetizes and voltage decreases |
| B. | Magnetizes and voltage increases |
| C. | Magnetizes and voltage decreases |
| D. | Demagnetizes and voltage increases |
| Answer» B. Magnetizes and voltage increases | |
| 73. |
If W is the dead weight of the train in tones and A is the acceleration of the train in kmphps then the tractive effort required for linear acceleration is given by |
| A. | WA newtons |
| B. | 177.7 WA newtons |
| C. | 277.8 WA newtons |
| D. | 388.8 WA newtons |
| Answer» D. 388.8 WA newtons | |
| 74. |
High frequency eddy current heating is used for |
| A. | Melting of non-ferrous metals |
| B. | High grade alloy steel production |
| C. | Hardening the surfaces of materials being heated |
| D. | Vacuum heating |
| Answer» D. Vacuum heating | |
| 75. |
Heat in water and air is transferred by |
| A. | Conduction |
| B. | Convection |
| C. | Radiation |
| D. | Either conduction or convection |
| Answer» C. Radiation | |
| 76. |
For welding aluminium alloys, the electrodes used are |
| A. | Hard drawn copper |
| B. | Cadmium copper |
| C. | Chromium copper |
| D. | Tungsten copper |
| Answer» B. Cadmium copper | |
| 77. |
For running at half of the maximum speed, the batteries of battery electric drive are connected in |
| A. | Parallel |
| B. | Series |
| C. | Series - parallel |
| D. | Drive cannot run at this speed |
| Answer» D. Drive cannot run at this speed | |
| 78. |
For regenerative braking, the motor which is not suitable is |
| A. | DC shunt motor |
| B. | DC compound motor |
| C. | DC deries motor |
| D. | AC shunt motor |
| Answer» D. AC shunt motor | |
| 79. |
For improving the power factor of coreless type induction furnace, |
| A. | Capacitor is used |
| B. | Inductor is used |
| C. | Resistor is used |
| D. | Transistor is used |
| Answer» B. Inductor is used | |
| 80. |
For best visual performance, the range of brightness within the field of vision |
| A. | Should be less than 3:1 |
| B. | Should be greater than 3:1 |
| C. | Should be less than 1:3 |
| D. | Should be greater than 1:3 |
| Answer» B. Should be greater than 3:1 | |
| 81. |
For avoiding hard and long shadows, |
| A. | Large number of small luminaries mounted at a height of less than 2.5 m can be used |
| B. | Large number of small luminaries mounted at a height of not less than 2.5 m can be used |
| C. | Small number of small luminaries mounted at a height of less than 2.5 m can be used |
| D. | Small number of large luminaries mounted at a height of not less than 2.5 m can be used |
| Answer» C. Small number of small luminaries mounted at a height of less than 2.5 m can be used | |
| 82. |
For a good weld, |
| A. | Cross - section of the added metal should be small and oxidation should be minimum |
| B. | Cross - section of the added metal should be small and oxidation should be maximum |
| C. | Cross - section of the added metal should be large and oxidation should be minimum |
| D. | Cross - section of the added metal should be large and oxidation should be maximum |
| Answer» B. Cross - section of the added metal should be small and oxidation should be maximum | |
| 83. |
Flood lighting is used for |
| A. | For enhancing the beauty of building at nights |
| B. | For illuminating sports stadium |
| C. | For illuminating show cases |
| D. | All of these |
| Answer» E. | |
| 84. |
Eureka is an alloy of |
| A. | Nickel and chromium |
| B. | Nickel and copper |
| C. | Iron, chromium and aluminium |
| D. | Nickel, chromium and aluminium |
| Answer» C. Iron, chromium and aluminium | |
| 85. |
Electroplating is done |
| A. | To protect the metals against corrosion |
| B. | To give shiny appearance to articles |
| C. | To repair the worn out materials |
| D. | All of these |
| Answer» E. | |
| 86. |
During the train movement, the tractive effort produced at the pinion by the motor is transferred to the driving wheel |
| A. | Directly |
| B. | Through the gear wheel |
| C. | Through the road wheel |
| D. | Through the motor armature |
| Answer» C. Through the road wheel | |
| 87. |
During plugging, the speed of the motor gradually decreases. If the supply to the motor is not cut - off then the |
| A. | Motor will continue to rotate in the same direction |
| B. | Motor will continue to rotate in the reverse direction |
| C. | Motor will come to rest |
| D. | None of these |
| Answer» D. None of these | |
| 88. |
Direct resistance heating method is used in |
| A. | Salt bath furnaces |
| B. | Resistance welding |
| C. | Electrode boiler for heating water |
| D. | All of these |
| Answer» E. | |
| 89. |
CFL means |
| A. | Combustible fluoride lamp |
| B. | Compact fluoride lamp |
| C. | Compact fluorescent lamp |
| D. | Combustible fluorescent lamp |
| Answer» D. Combustible fluorescent lamp | |
| 90. |
Arc welding is also known as |
| A. | Pressure welding |
| B. | Plastic welding |
| C. | Non - pressure welding |
| D. | None of these |
| Answer» D. None of these | |
| 91. |
An ac timer circuit is used to control the number of cycles for which the power may be supplied to the weld. In this, the time required for the voltage to fall by a given amount is |
| A. | Directly proportional to the resistor |
| B. | Directly proportional to the capacity of the condenser |
| C. | Directly proportional to the inductor |
| D. | Only (a) and (b) |
| Answer» E. | |
| 92. |
After welding, the welded parts retain which properties of the metal? |
| A. | Melting point |
| B. | Density |
| C. | Thermal conductivity |
| D. | All of these |
| Answer» E. | |
| 93. |
Advantage of using electron beam welding is / are |
| A. | Welds are clean |
| B. | Absence of porosity |
| C. | Distortion less |
| D. | All of these |
| Answer» E. | |
| 94. |
According to the first law of illumination, the illumination of a surface due to a source of light is |
| A. | Inversely proportional to the distance between the surface and the source of light |
| B. | Inversely proportional to the square of the distance between the surface and the source of light |
| C. | Directly proportional to the distance between the surface and the source of light |
| D. | Directly proportional to the square of the distance between the surface and the source of light |
| Answer» C. Directly proportional to the distance between the surface and the source of light | |
| 95. |
According to the Faraday’s first laws of electrolysis, the mass of substance liberated during electrolysis is |
| A. | Directly proportional to the current flowing through the electrolyte |
| B. | Directly proportional to time for which current flows |
| C. | Directly proportional to the charge |
| D. | Only (a) and (b) |
| Answer» E. | |
| 96. |
According to second law of illumination, the illumination at any point on an inclined surface is |
| A. | Directly proportional to the cosine of the angle between the normal to the surface at that point |
| B. | Directly proportional to the sin of the angle between the normal to the surface at that point |
| C. | Directly proportional to the tan of the angle between the normal to the surface at that point |
| D. | Directly proportional to the cot of the angle between the normal to the surface at that point |
| Answer» B. Directly proportional to the sin of the angle between the normal to the surface at that point | |
| 97. |
AC series motors are most suitable for |
| A. | Urban services |
| B. | Sub-urban services |
| C. | Main line services |
| D. | All of these |
| Answer» D. All of these | |
| 98. |
A trolley bus runs on tyres driven by |
| A. | A DC compound motor |
| B. | A DC series motor |
| C. | An AC series motor |
| D. | An AC shunt motor |
| Answer» B. A DC series motor | |
| 99. |
A low frequency supply is given to the single phase AC system for track electrification because |
| A. | It improves commutation |
| B. | Increases efficiency |
| C. | Improves power factor |
| D. | All of these |
| Answer» E. | |
| 100. |
A good heating element should have |
| A. | High resistivity and low melting point |
| B. | Low resistivity and high melting point |
| C. | High resistivity and high melting point |
| D. | Low resistivity and low melting point |
| Answer» D. Low resistivity and low melting point | |