1) The efficiency of heating is more for
a. Solid fuels
b. Oil heating
c. Gas heating
d. Electric heating
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2) The heat can be transferred from high temperature body to low temperature body by
a. Conduction method
b. Convection method
c. Radiation method
d. All of these
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3) Heat in water and air is transferred by
a. Conduction
b. Convection
c. Radiation
d. Either conduction or convection
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Answer
Explanation
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ANSWER: Convection
Explanation:
No explanation is available for this question!
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4) 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
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Answer
Explanation
Related Ques
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ANSWER: Directly proportional to the square of induced voltage and inversely proportional to the resistance
Explanation:
No explanation is available for this question!
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5) The core type induction furnace and the coreless type induction furnace are
a. Low frequency, high frequency
b. Low frequency, low frequency
c. High frequency, high frequency
d. High frequency, low frequency
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6) 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
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7) When sulfate molecules reacts with the water then
a. Hydrogen is liberated
b. Oxygen is liberated
c. Sulphurdioxide is formed
d. All of these
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8) 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)
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9) The current efficiency is defined as the ratio of
a. Actual quantity of the substance deposited to the theoretical quantity of the substance deposited
b. Actual quantity of the substance deposited to the theoretical quantity of the substance liberated
c. Theoretical quantity of the substance deposited to the actual quantity of the substance deposited
d. Theoretical quantity of the substance deposited to the actual quantity of the substance liberated
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Answer
Explanation
Related Ques
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ANSWER: Actual quantity of the substance deposited to the theoretical quantity of the substance liberated
Explanation:
No explanation is available for this question!
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10) With increase in temperature of the body, the emission of light waves is
a. Increases
b. Decreases
c. Remains same
d. None of these
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11) The range of visible radiation lies between
a. 2000 angstrom to 2500 angstrom
b. 4000 angstrom to 4500 angstrom
c. 5000 angstrom to 6000 angstrom
d. 4000 angstrom to 7500 angstrom
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12) Lux is the unit of
a. Luminous flux
b. Luminous intensity
c. Illumination
d. Luminance
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13) The illumination due to good daylight is approximately equal to
a. 100 lux
b. 200 lux
c. 300 lux
d. 400 lux
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14) The suitable lamps for street lighting are
a. Mercury vapour lamps
b. Sodium discharge lamps
c. Both (a) and (b)
d. None of these
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15) 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
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16) The glare can be reduced by
a. Decreasing the height of bright light sources
b. Using glossy surfaces for bench tops
c. Using reflectors to the bright sources
d. All of these
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17) The propulsion of heavy vehicle is called
a. Illumination
b. Electric movement
c. Electric traction
d. Hybrid vehicle
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18) The steam engine drive and electric traction drive
a. Both uses electricity for its operation
b. Former do not use electricity at any stage of its operation and later uses electricity for its operation
c. Former uses electricity for its operation and the later one do not use electricity for its operation
d. Both do not use electricity at any stage for its operation
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Answer
Explanation
Related Ques
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ANSWER: Both do not use electricity at any stage for its operation
Explanation:
No explanation is available for this question!
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19) The haulage capacity is more for
a. Steam engine system
b. Internal combustion engine drive
c. Battery electric drive
d. None of these
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20) The slope of the speed - time curve at any point gives the
a. Acceleration of the train at that point of time
b. Retardation of the train at that point of time
c. Distance travelled by the train
d. Either (a) or (b)
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21) 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
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22) 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
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23) The motor which is most suitable for the traction work is / are
a. DC series motor
b. DC shunt motor
c. Single phase ac series motor
d. Three phase induction motor
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24) AC series motors are most suitable for
a. Urban services
b. Sub-urban services
c. Main line services
d. All of these
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25) Three phase induction motor is not suitable for traction purpose because
a. Low starting torque
b. High starting current
c. Constant speed operation
d. All of these
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26) After welding, the welded parts retain which properties of the metal?
a. Melting point
b. Density
c. Thermal conductivity
d. All of these
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27) The example of plastic welding is
a. Resistance welding
b. Gas welding
c. Arc welding
d. Thermit welding without pressure
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28) The fusion welding is also known as
a. Plastic welding
b. Pressure welding
c. Non - pressure welding
d. None of these
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29) Arc welding is also known as
a. Pressure welding
b. Plastic welding
c. Non - pressure welding
d. None of these
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30) In metal arc welding, the filler material required is
a. Iron
b. Copper
c. Aluminium
d. No filler is required
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31) The electrodes used in carbon arc welding are made up of
a. Carbon
b. Graphite
c. Either carbon or graphite
d. Zinc
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