1) 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
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2) 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
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3) 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
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4) Eureka is an alloy of
a. Nickel and chromium
b. Nickel and copper
c. Iron, chromium and aluminium
d. Nickel, chromium and aluminium
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5) Which type of heating is used for sterilization?
a. High frequency eddy current heating
b. Coreless type heating
c. Core type heating
d. Dielectric heating
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6) The dielectric strength of air gap is
a. 2.11kV/cm
b. 21.1kV/m
c. 21.1kV/cm
d. 2.11kV/m
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7) The temperature produced in indirect arc furnace is
a. More than in direct arc furnace
b. Less than direct arc furnace
c. Equal to direct arc furnace
d. None of these
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8) Throwing power can be improved by
a. Increasing distance between the anode and cathode
b. By reducing the voltage drop at the cathode
c. By increasing current density
d. Only (a) and (b)
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9) 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
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10) The power required for electro-deposition is
a. DC and very low voltage
b. DC and high voltage
c. AC and very low voltage
d. AC and high voltage
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11) The metal oxide rectifier used for electrolytic process is placed along with the transformer
a. Inside the oil
b. Outside the transformer but near to it
c. Outside the transformer but far from it
d. Half immersed in the oil
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12) 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
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13) 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
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Answer
Explanation
Related Ques
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ANSWER: Large number of small luminaries mounted at a height of not less than 2.5 m can be used
Explanation:
No explanation is available for this question!
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14) 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
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Answer
Explanation
Related Ques
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ANSWER: Lumens on the working plane under normal working conditions to the lumens on the working plane under ideal condition
Explanation:
No explanation is available for this question!
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15) The practical luminous efficiency of the sodium vapour lamp is of the order of
a. 25 to 40 lumens per watt
b. 40 to 45 lumens per watt
c. 45 to 50 lumens per watt
d. 60 to 67 lumens per watt
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16) The main electrode of high pressure mercury vapour lamp is made up of
a. Quartz
b. Hard glass
c. Tungsten
d. Bronze
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17) 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
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Answer
Explanation
Related Ques
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ANSWER: Former capacitors is used for improving power factor and later is used for reducing radio interference
Explanation:
No explanation is available for this question!
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18) CFL means
a. Combustible fluoride lamp
b. Compact fluoride lamp
c. Compact fluorescent lamp
d. Combustible fluorescent lamp
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19) 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
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20) 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
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21) 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
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22) The area under the speed - time curve represents the
a. Acceleration of the train
b. Time taken by the train
c. Distance travelled by the train
d. Crest speed
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23) 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
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24) 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
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25) The magnitude for the tractive effort which is required for the propulsion of the train depends on
a. The adhesive weight
b. Friction between the driving wheel and the track
c. Both (a) and (b)
d. Neither (a) nor (b)
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26) 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
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27) Pantograph collector is used in railways where the train runs at 100 to 130 kmph. Which among the following is true about pantograph collector?
a. It is unidirectional
b. The erection of the overhead network is complicated
c. Its height cannot be varied
d. None of these
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28) The lighting system of almost all the earlier coaches and all the newly manufactured coaches has
a. 50 V
b. 110 V
c. 220 V
d. 420 V
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29) Seam welding is not used for the
a. Welding in tanks
b. Welding in transformers
c. Welding in air crafts
d. Welding alloys of copper
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30) In percussion welding, the heat is produced by a rapid discharge of stored electrical energy from
a. Capacitor
b. Inductor
c. Resistor
d. Transformer
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31) The electrodes used for projection welding are
a. Flat and smaller in diameter
b. Flat and larger in diameter
c. Round and smaller in diameter
d. Round and larger in diameter
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32) Spot welding is used to weld metal pieces whose thickness
a. Should be greater than 12 mm
b. Lesser than 12 mm
c. Lies between 15 to 20 mm
d. Greater than 20 mm
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33) The voltage - current characteristics of the arc welding must be
a. Exponentially rising
b. Drooping
c. Straight line
d. Parabolic
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34) The advantage of rectifier type welding set is
a. Reduced no - load losses
b. Easy arc starting
c. Less hazardous
d. Both (a) and (b)
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35) 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
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Answer
Explanation
Related Ques
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ANSWER: Cross - section of the added metal should be small and oxidation should be minimum
Explanation:
No explanation is available for this question!
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