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Magnetism +AC/DC Review

Total questions: 35

Worksheet time: 19mins

Name
Class
Date
1.

If you cut a magnet in half, what happens to the poles?

a)

One half gets the North Pole, the other half gets the South Pole.

b)

Both halves get only a South Pole.

c)

Both halves get only a North Pole.

d)

Both halves get a North pole and a South Pole.

2.

What can happen if you connect and run a self exited DC generator as a motor?

a)

Damage the prime mover

b)

Cancel out the residual magnetism in the pole pieces

c)

Burn windings and/or damage the commutator

d)

All of these answers are correct

3.

What is the amount of time necessary to complete one cycle if the waveform has a frequency of 200Hz?

a)

5ms

b)

10ms

c)

3ms

d)

12ms

4.
Where is the force of attraction the strongest on a magnet?
a)
at the poles
b)
in the middle
c)
above the magnet
d)
below the magnet
5.
Where are the magnetic force the strongest in this picture?
a)
Location 1
b)
Location 2
c)
Location 3
d)
Location 4
6.

A motor is operating a load that requires 26 lb-ft of torque and is turning at a speed of 1,000 RPM. What is the HP output of the motor?

a)

6.25 hp

b)

7.62 hp

c)

4.95 hp

d)

5.26 hp

7.

Which DC motor wiring configuration is known to provide the best torque?

a)

Horse

b)

Compound Motor

c)

Shunt motor

d)

Series Motor

8.

What is the AVG voltage if you have 848.4 volts Peak?

a)

600v

b)

540.43v

c)

477v

d)

689.23v

9.

The measure of opposition to the flow of magnetic lines through a material is known as:

a)

Redundancy

b)

Recidivism

c)

Reluctance

d)

Reactance

10.

What is the proper terminal identification for a DC series motor?

A1,A2, S1,S2

R1,R2, F1,F2

A1,A2, F1,F2

a)

A1,A2, S1,S2

b)

R1,R2, F1,F2

c)

A1,A2, F1,F2

d)

L1,L2, S1,S2

11.

What is induced in a conductor the constant change in a magnetic field?

a)

Hysteresis

b)

Skin effect

c)

Eddy current

d)

Dielectric stress

12.

What is the term for a type of magnetic loss that occurs due to the resistance of the magnet domains aligning and randomizing

a)

Hysteresis

b)

Skin effect

c)

Eddy current

d)

Dielectric stress

13.

A DC motor is connected to a 285v DC source and has a current draw of 25.5 A. The motor has a HP of 7.14 hp. What is the efficiency of the motor?

a)

83.49 percent

b)

73.29 percent

c)

92.67 percent

d)

68.52 percent

14.

A motor is operating a load that requires 28 lb-ft of torque and is turning at a speed of 1,150 RPM. What is the HP output of the motor?

a)

6.13 hp

b)

7.48 hp

c)

5.64 hp

d)

6.99 hp

15.

What type of motor configuration should be avoided?

a)

Steam Powered Motor

b)

Differential Compound Motor

c)

Any Motor! I only do plugs and switches

d)

600v motors... I'm scared

16.
You can make an electromagnet stronger by...
a)
increasing the current through the wire
b)
make the iron core bigger
c)
increase the number of loops around the core
d)
All of these
17.

What is this motor configuration?

a)

Long Shunt

b)

Short Shunt

c)

Series

d)

Shunt

18.

When changing the direction of a DC motor it is best to change the polarity of the _______

a)

Shunt Field

b)

Series Field

c)

Armature

d)

Input Power

19.

What is 24kilowatts in horsepower?

a)

32.17 hp

b)

42.63 hp

c)

36.56 hp

d)

39.89 hp

20.

A group of atoms that has all like poles pointing in the same direction are called

a)

magnetic forces

b)

magnetic fields

c)

magnetic domains

d)

magnetic poles

21.

This type of field is made up of a few turns of larger gauge wire

a)

Shunt

b)

Series

c)

Soccer

d)

Football

22.

  1. What type of voltage is produced in all rotating armatures?

    1. Constant

a)

  1. DC voltage

b)

Pulsating DC voltage

c)

  1. AC voltage

d)

  1. Ripple-free DC voltage

23.
You know this substance is magnetized because
a)
all the domains have right angles
b)
the arrows are drawn in red
c)
the domains are aligned
d)
the domains are random
24.

What is the frequency if an ac waveform completes a cycle every 16.66ms?

a)

60MHz

b)

100Hz

c)

120Hz

d)

60Hz

25.

Which DC generator wiring configuration is known to provide good voltage regulation under varying loads?

a)

Series

b)

Shunt

c)

Permanent Magnet

d)

Brushless

26.

Which of the following is NOT 0v on an AC waveform?

a)

0 degrees

b)

90 degrees

c)

180 degrees

d)

360 degrees

27.

What is the RMS voltage if you have 400 volts Peak?

a)

282.89v

b)

347v

c)

240v

d)

312.59v

28.

What is the AVG voltage if you have 48 volts RMS?

a)

24v

b)

56.23v

c)

30v

d)


43.2v


29.

  1. What are the three types of armature winding?

a)

Permanent Magnet, Electro Magnet, Brushless

b)

Series, Shunt, Compound

c)

  1. Lap, Wave, and Frog-leg

d)

  1. Helical, Toroidal, Spiral

30.

Which of the following are examples of Prime Movers for DC generators?

a)

Dancing Optimus

b)

Wind Turbines

c)

Amazon Delivery Drivers

d)

2, 3, 5, 7, 11, 13, 17, 19, 23

31.

What is the RMS voltage if you have 432 volts AVG?

a)

600v

b)

347v

c)

450v

d)

480v

32.

What is the voltage along a sine wave at 150 degrees if the peak voltage of the sine wave is 200 volts?

a)

200v

b)

150v

c)

120v

d)

100v

33.

What is the angle in a sine wave if the instantaneous voltage is 300 volts and the peak voltage is 347volts?

a)

90 degrees

b)

47.96 degrees

c)

59.83 degrees

d)

0 degrees

34.

What is the function of a commutator in a DC Generator?

a)

Converts DC to AC

b)

Maintains polarity at all times

c)

Converts AC to DC

d)

Stops backfeeding from happening

35.
What will happen when these magnets are brought close together?
a)
They will attract each other.
b)
They will repel each other.
c)
Both magnets will turn to the left
d)
Both magnets will turn to the right

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