3-I-062: Motors & Generators
3-62I1:
What occurs if the load is removed from an operating series DC motor?
It will accelerate until it falls apart.
It will stop running.
Speed will increase slightly.
No change occurs.
3-62I2:
If a shunt motor running with a load has its shunt field opened, how would this affect the speed of the motor?
It will speed up.
It will slow down.
It will stop suddenly.
It will be unaffected.
3-62I3:
The expression “voltage regulation” as it applies to a shunt-wound DC generator operating at a constant frequency refers to:
Voltage fluctuations from load to no-load.
Voltage output efficiency.
Voltage in the secondary compared to the primary.
Rotor winding voltage ratio
3-62I4:
What is the line current of a 7 horsepower motor operating on 120 volts at full load, a power factor of 0.8, and 95% efficient?
57.2 amps.
4.72 amps.
13.03 amps.
56 amps.
3-62I5:
A 3 horsepower, 100 V DC motor is 85% efficient when developing its rated output. What is the current?
26.300 amps.
8.545 amps.
20.345 amps.
25.000 amps.
3-62I6:
The output of a separately-excited AC generator running at a constant speed can be controlled by:
The amount of field current.
The armature.
The brushes.
The exciter.
|
Color key:
|
|
● = Unseen
|
|
● = Weak
|
|
● = Review
|
|
● = Learned
|
|
● = Incorrect answer
|
