9.

How is the torque of a shunt DC motor affected if the armature current is doubled?

a.

Halved.

b.

Reduced by one-eighth.

c.

Increased by one-fourth.

d.

Doubled.

10.

What characterizes a DC shunt motor?

a.

Constant speed.

b.

Varying speed and constant torque.

c.

Constant torque.

d.

Varying torque and varying speed.

11.

What is the formula for generator frequency?

a.

b.

f = PN x 120.

c.

d.

f = PN x 60.

12.

What is the difference, in degrees, between windings of a three-phase generator?

a.

45.

b.

60.

c.

90.

d.

120.

13.

a.

1,100.

b.

1,600.

c.

1,800.

d.

2,200.

14.

Which motor is normally used for timing devices?

a.

DC series.

b.

AC series.

c.

Compound.

d.

Synchronous.

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