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MCQs 1: The practical luminous efficiency of the sodium vapour lamp is of the order of

25 to 40 lumens per watt 40 to 45 lumens per watt 45 to 50 lumens per watt 60 to 67 lumens per watt
Answer Explanation

MCQs 2: The main electrode of high pressure mercury vapour lamp is made up of

Quartz Hard glass Tungsten Bronze
Answer Explanation

MCQs 3: In fluorescent lamp one capacitor is connected across the lamp circuit and another is connected across the starter. Then

Both the capacitors are used for improving power factor Both the capacitors are used for reducing radio interference Former capacitors is used for improving power factor and later is used for reducing radio interference Former capacitors is used for reducing radio interference and later is used for improving power factor
Answer Explanation

MCQs 4: CFL means

Combustible fluoride lamp Compact fluoride lamp Compact fluorescent lamp Combustible fluorescent lamp
Answer Explanation

MCQs 5: A trolley bus runs on tyres driven by

A DC compound motor A DC series motor An AC series motor An AC shunt motor
Answer Explanation

MCQs 6: In diesel electric traction, the torque required from traction work must be

Directly proportional to the speed Inversely proportional to the speed Independent of the speed Directly proportional to the square of the speed
Answer Explanation

MCQs 7: In a diesel electric traction, if the current in the traction motor increases then the generator field

Demagnetizes and voltage decreases Magnetizes and voltage increases Magnetizes and voltage decreases Demagnetizes and voltage increases
Answer Explanation

MCQs 8: The area under the speed - time curve represents the

Acceleration of the train Time taken by the train Distance travelled by the train Crest speed
Answer Explanation

MCQs 9: During the train movement, the tractive effort produced at the pinion by the motor is transferred to the driving wheel

Directly Through the gear wheel Through the road wheel Through the motor armature
Answer Explanation

MCQs 10: 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

WA newtons 177.7 WA newtons 277.8 WA newtons 388.8 WA newtons
Answer Explanation

MCQs 11: The magnitude for the tractive effort which is required for the propulsion of the train depends on

The adhesive weight Friction between the driving wheel and the track Both (a) and (b) Neither (a) nor (b)
Answer Explanation

MCQs 12: A low frequency supply is given to the single phase AC system for track electrification because

It improves commutation Increases efficiency Improves power factor All of these
Answer Explanation

MCQs 13: Pantograph collector is used in railways where the train runs at 100 to 130 kmph. Which among the following is true about pantograph collector?

It is unidirectional The erection of the overhead network is complicated Its height cannot be varied None of these
Answer Explanation

MCQs 14: The lighting system of almost all the earlier coaches and all the newly manufactured coaches has

50 V 110 V 220 V 420 V
Answer Explanation

MCQs 15: Seam welding is not used for the

Welding in tanks Welding in transformers Welding in air crafts Welding alloys of copper
Answer Explanation

MCQs 16: In percussion welding, the heat is produced by a rapid discharge of stored electrical energy from

Capacitor Inductor Resistor Transformer
Answer Explanation

MCQs 17: The electrodes used for projection welding are

Flat and smaller in diameter Flat and larger in diameter Round and smaller in diameter Round and larger in diameter
Answer Explanation

MCQs 18: Spot welding is used to weld metal pieces whose thickness

Should be greater than 12 mm Lesser than 12 mm Lies between 15 to 20 mm Greater than 20 mm
Answer Explanation

MCQs 19: The voltage - current characteristics of the arc welding must be

Exponentially rising Drooping Straight line Parabolic
Answer Explanation

MCQs 20: The advantage of rectifier type welding set is

Reduced no - load losses Easy arc starting Less hazardous Both (a) and (b)
Answer Explanation

MCQs 21: For a good weld,

Cross - section of the added metal should be small and oxidation should be minimum Cross - section of the added metal should be small and oxidation should be maximum Cross - section of the added metal should be large and oxidation should be minimum Cross - section of the added metal should be large and oxidation should be maximum
Answer Explanation

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