Electric Power Utilization Test Questions Start Creating PDF

MCQ: For a good weld,

1. Cross - section of the added metal should be small and oxidation should be minimum
2. Cross - section of the added metal should be small and oxidation should be maximum
3. Cross - section of the added metal should be large and oxidation should be minimum
4. Cross - section of the added metal should be large and oxidation should be maximum

MCQ: The advantage of rectifier type welding set is

1. Reduced no - load losses
2. Easy arc starting
3. Less hazardous
4. Both (a) and (b)

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

1. Exponentially rising
2. Drooping
3. Straight line
4. Parabolic

MCQ: Spot welding is used to weld metal pieces whose thickness

1. Should be greater than 12 mm
2. Lesser than 12 mm
3. Lies between 15 to 20 mm
4. Greater than 20 mm

MCQ: The electrodes used for projection welding are

1. Flat and smaller in diameter
2. Flat and larger in diameter
3. Round and smaller in diameter
4. Round and larger in diameter

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

1. Capacitor
2. Inductor
3. Resistor
4. Transformer

MCQ: Seam welding is not used for the

1. Welding in tanks
2. Welding in transformers
3. Welding in air crafts
4. Welding alloys of copper

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

1. 50 V
2. 110 V
3. 220 V
4. 420 V

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

1. It is unidirectional
2. The erection of the overhead network is complicated
3. Its height cannot be varied
4. None of these

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

1. It improves commutation
2. Increases efficiency
3. Improves power factor
4. All of these