Quiz sheet for single phase universal motors

A large series universal motor should never be connected on no load because it

A) may accelerate to a speed that causes it to explode 

B) may cause a short circuit.

C) may not start

D) will have no back emf,

ANSWER: A

The reason a series universal motor would be used in a hand held pistol drill is they

A) have very high power output for small size

B) have constant speed

C) have high torque at synchronous speed

D) are maintenance free

ANSWER: A

The torque speed curve illustrated below is for a 

A) series universal motor

B) capacitor start motor

C) shaded pole motor

D) shunt motor

ANSWER: A

A series universal motor would be the best type of motor for a wood router because they

A) can run at higher speed than any induction motor

B) have high torque

C) are constant speed

D) are cheap to make

ANSWER: A

If a universal motor is connected to a DC supply it will

A) run quieter.

B) burn out.

C) not run.

D) short circuit.

ANSWER: A

The easiest way to identify a universal motor is 

A) the presence of a comutator

B) read the lable

C) check for a centrifugal switch

D) connect it to a DC supply

ANSWER: A

Reversing a universal motor is achieved by reversing

A) the leads on the armature but not the field

B) the supply leads

C) the polarity

D) one field pole

ANSWER: A

Universal motors are the same as DC motors except a DC motor

A) does not require laminations in the field poles

B) has brushes

C) can be reversed

D) can have a shunt field

ANSWER: A

The reason a vacuum cleaner is so noisy is because

A) it has a series universal motor that runs at high speed. 

B) the fan is hitting the dust when it operates.

C) the air inside is rushing past the motor

D) manufactures make them noisy so you will know that they are on.

ANSWER: A


Last modified: Friday, 28 May 2021, 5:51 PM