Question 1

A transformer in which the secondary voltage is more than the primary voltage is called a(n)  _____ transformer.

Accepted Answer

A)   step-down
B)   step-up
C)   isolation
D)   autoE) All of the above
F) A) and B) B

Question 2

The industrial use transformer that normally has 240 V or 480 V primary and a 120 V secondary is called a(n)  _____ transformer.

Accepted Answer

A)   auto
B)   distribution
C)   isolation
D)   controlE) A) and C)
F) B) and C)

Question 3

What is a magnetically operated device that can change values of voltage, current, and impedance without changing frequency?

Accepted Answer

A)   a converter
B)   an inverter
C)   a transformer
D)   a transistorE) A) and B)
F) None of the above

Question 4

A transformer that has one winding, which is used for both the primary and secondary, is called a(n)  _____.

Accepted Answer

A)   distribution transformer
B)   step-up transformer
C)   autotransformer
D)   control transformerE) None of the above
F) B) and C)

Question 5

A transformer has a 240 V primary and a 120 V secondary. With a 30 ohm load connected, what is the primary volt-amps?

Accepted Answer

A)   4
B)   8
C)   480
D)   960E) A) and B)
F) B) and C)

Question 6

The power input winding of a transformer is called the _____ winding.

Accepted Answer

A)   primary
B)   secondary
C)   tertiary
D)   tappedE) B) and C)
F) A) and D) A

Question 7

A transformer has a 2:1 turns ratio. 120 V is applied to the primary. What is the secondary voltage?

Accepted Answer

A)   24 V
B)   60 V
C)   120 V
D)   600 VE) B) and C)
F) A) and D)

Question 8

A tape-wound core is assembled by _____.

Accepted Answer

A)   stacking small individual sheets of metal
B)   winding a long continuous tape into a spiral
C)   casting a solid core and wrapping it with tape
D)   bolting together two halvesE) A) and D)
F) A) and C)

Question 9

The amount of current that flows into a transformer primary when voltage is first applied is called _____ current.

Accepted Answer

A)   magnetizing
B)   excitation
C)   activating
D)   inrushE) None of the above
F) A) and C)

Question 10

The transformer that converts a high voltage from the power company down to 240/120 V for homes and businesses is called a(n)  _____ transformer.

Accepted Answer

A)   auto
B)   distribution
C)   control
D)   householdE) A) and D)
F) A) and C)

Question 11

In a transformer, even when there is no load connected, there will be some small current flow known as _____ current.

Accepted Answer

A)   excitation
B)   primary
C)   secondary
D)   hysteresisE) B) and C)
F) A) and D)

Question 12

A tape-wound core is also called a(n)  _____ core.

Accepted Answer

A)   toroid
B)   solid
C)   H
D)   EE) B) and D)
F) A) and C)

Question 13

A transformer supplying a house with 240/120 V has a secondary which is center tapped. The conductor connected to the center is called the _____ conductor.

Accepted Answer

A)   equipment ground
B)   hot
C)   neutral
D)   ungroundedE) None of the above
F) A) and B)

Question 14

A transformer has a 240 V primary and a 60 V secondary. With a 5 ohm load connected, what is the primary current?

Accepted Answer

A)   2 A
B)   3 A
C)   7 A
D)   8 AE) B) and C)
F) A) and D)

Question 15

What type of core is often found on high-voltage distribution transformers?

Accepted Answer

A)   shell-type
B)   H-type
C)   tape-wound
D)   toroidE) B) and D)
F) All of the above

Question 16

An isolation transformer has the same input and output voltages.

Accepted Answer

A) True 
 B)False

Question 17

Any transformer flux that does not follow the core and escapes into the surrounding air is called _____.

Accepted Answer

A)   magnetizing flux
B)   flux coupling
C)   flux leakage
D)   flux reactanceE) B) and C)
F) All of the above

Question 18

In a transformer, the turns of primary wire compared to the turns of secondary wire is called the _____ ratio.

Accepted Answer

A)   isolation
B)   step-up
C)   step-down
D)   turnsE) A) and B)
F) B) and C)

Question 19

A transformer in which the primary and secondary are physically separated and not connected by a conductor is called a(n)  _____ transformer.

Accepted Answer

A)   isolation
B)   step-up
C)   step-down
D)   turnsE) All of the above
F) B) and D) A

Question 20

A transformer in which the secondary voltage is less than the primary voltage is called a(n)  _____ transformer.

Accepted Answer

A)   step-up
B)   isolation
C)   step-down
D)   autoE) All of the above
F) A) and B)

Exam 28: Single-Phase Transformers

A transformer in which the secondary voltage is more than the primary voltage is called a(n) _____ transformer.

Correct AnswerverifiedB

The industrial use transformer that normally has 240 V or 480 V primary and a 120 V secondary is called a(n) _____ transformer.

Correct AnswerverifiedShow Answer

What is a magnetically operated device that can change values of voltage, current, and impedance without changing frequency?

Correct AnswerverifiedShow Answer

A transformer that has one winding, which is used for both the primary and secondary, is called a(n) _____.

Correct AnswerverifiedShow Answer

A transformer has a 240 V primary and a 120 V secondary. With a 30 ohm load connected, what is the primary volt-amps?

Correct AnswerverifiedShow Answer

The power input winding of a transformer is called the _____ winding.

Correct AnswerverifiedA

A transformer has a 2:1 turns ratio. 120 V is applied to the primary. What is the secondary voltage?

Correct AnswerverifiedShow Answer

A tape-wound core is assembled by _____.

Correct AnswerverifiedShow Answer

The amount of current that flows into a transformer primary when voltage is first applied is called _____ current.

Correct AnswerverifiedShow Answer

The transformer that converts a high voltage from the power company down to 240/120 V for homes and businesses is called a(n) _____ transformer.

Correct AnswerverifiedShow Answer

In a transformer, even when there is no load connected, there will be some small current flow known as _____ current.

Correct AnswerverifiedShow Answer

A tape-wound core is also called a(n) _____ core.

Correct AnswerverifiedShow Answer

A transformer supplying a house with 240/120 V has a secondary which is center tapped. The conductor connected to the center is called the _____ conductor.

Correct AnswerverifiedShow Answer

A transformer has a 240 V primary and a 60 V secondary. With a 5 ohm load connected, what is the primary current?

Correct AnswerverifiedShow Answer

What type of core is often found on high-voltage distribution transformers?

Correct AnswerverifiedShow Answer

An isolation transformer has the same input and output voltages.

Correct AnswerverifiedShow Answer

Any transformer flux that does not follow the core and escapes into the surrounding air is called _____.

Correct AnswerverifiedShow Answer

In a transformer, the turns of primary wire compared to the turns of secondary wire is called the _____ ratio.

Correct AnswerverifiedShow Answer

A transformer in which the primary and secondary are physically separated and not connected by a conductor is called a(n) _____ transformer.

Correct AnswerverifiedA

A transformer in which the secondary voltage is less than the primary voltage is called a(n) _____ transformer.

Correct AnswerverifiedShow Answer

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