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SYNCHRONOUS MOTOR

Total questions: 10

Worksheet time: 12mins

Name
Class
Date
1.
What does a motor do?
a)
Moves up and down
b)
Rotates without Electricity 
c)
It does
d)
Uses Electricity to cause motion (usually, rotational motion)
2.

State TWO type of rotor in Synchronous Generator

a)

Field winding

b)

Armature winding

c)

Salient pole

d)

Cylindrical (non-salient/round)

3.

State TWO type of winding in Synchronous Generator

a)

Field winding

b)

Armature winding

c)

Salient pole

d)

Cylindrical (non-salient/round)

4.

Which type of rotor require large no of poles?

a)

Salient pole

b)

Cylindrical pole

c)

Squirrel cage pole

d)

Wound pole

5.

At what speed three-phase cylindrical two-pole synchronous alternator rotates when connected to a 50 Hz infinite busbar system?

a)

1000 rpm

b)

1500 rpm

c)

3000 rpm

d)

6000 rpm

6.
which of the following the magnetic field current is supplied by a separate DC power source, 
a)
Induction machines
b)
synchronous machines
c)
Transformers
d)
AC genrators
7.
Electric motors are devices that convert _____ energy into  _____ energy.
a)
electrical; mechanical
b)
mechanical; electrical
c)
chemical; potential
d)
mechanical; kinetic
8.

Which answer is correct to explain about operation of Synchronous Generator

a)

The rotating magnetic field & the rotor rotate at the same speed

b)

The rotating magnetic field speed is faster than rotation of rotor

c)

The rotating of rotor is faster than magnetic field speed

d)

The rotor rotate when current induced at rotor.

9.

The selection of an electric motor for any application depends on which of the following factors ?

a)

Electrical characteristics

b)

Mechanical characteristics

c)

Size and rating of motors

d)

All of the above

10.
A synchronous motor has _____.
a)
Constant speed
b)
High speed at low torque
c)
Low speed at high torque
d)
Slight drop in speed at full load
e)