(I)Element 3-62 Motors & Generators

Question 1

What occurs if the load is removed from an operating series DC motor?

Answer 1

it will accelerate until it falls apart

Question 2

If a shunt motor running with a load has its shunt field opened, how would this affect the speed of the motor?

Answer 2

it will speed up

Question 3

The expression voltage regulation as it applies to a shunt wound dc generator opeating at a constant refers to

Answer 3

voltage fluctuatins from load to no load

Question 4

What is the line current of a 7 horsepower motor operating on 120 volts at full load, a power factor of 0.8, and 96% efficiency?

Answer 4

57.2 amps

Question 5

A 3 horsepower, 100 v DC motor is 85% efficient when developing its rated output. What is the current?

Answer 5

26.3 amps

Question 6

The output of a separately excited AC generator running at a constant speed can be controlled by

Answer 6

the amount of field current