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UPPCL EE :Electrical Machines Quiz 2

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Question 1

A four-pole d.c. machine armature has 54 slots. It is lap-wound with single-turn coils. How many armature coils are required?

Question 2

In which of the following winding we don’t use equaliser ring?

Question 3

Choose the correct statement related to DC shunt motor speed control.

S1: By reducing armature supply voltage (But not below rated values), speed can be reduced below rated speed.

S2: By reducing field current, speed can be reduced below rated speed.

Question 4

In a DC machine, armature MMF is

Question 5

For DC shunt motor, to increase speed above the rated speed.

1. Flux per pole can be reduced.

2. Field current can be reduced.

Choose the correct option:

Question 6

In a DC compound motor operating at rated voltage & rated torque. If the series winding is shorted, then what will be effect on speed of motor?

Question 7

A, 4 pole lap connected DC motor supplying a load of 5 kW at 100 V. Its armature consists of 800 conductors. If the brush displacement is 5° then what is the demagnetising mmf/pole?

Question 8

A DC generator has armature emf of 200 V when it works on full flux/pole 40 mWb, and speed of 500 rpm. The generated emf at a speed of 1000 rpm & flux/pole 20 mWb is

Question 9

In a lap winding, there are always as many paths in parallel through the armature winding as there are a number of poles. In such a lap winding, the current in each armature coil is

Question 10

A DC generator with a 12 pole, triplex lap winding excited with a flux/pole of 6.2 × 10-2 wb. The generator speed is 80 rpm, and it uses 420 coils of 20 turns each the total generated emf is __________ volts.

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