Question 1

The electrical current flowing in the alternators through conductors produces heat in the coils because of I² R losses.

Accepted Answer

The statement is true. R losses in the conductors cause heat to be generated, which is dissipated through the cooling system of the alternator.

Question 2

Many of the meters on generators are now in ____________________ format.

Accepted Answer

digital

Question 3

If there is a complete failure of the AC power, the oil switch cannot be operated from the DC source.

Accepted Answer

Oil switches can be operated from a DC source if the AC power fails, as they often have DC control circuits for such situations.

Question 4

Where are the control handle and indicating lamps for an oil switch and the oil switch itself located?

Accepted Answer

The answer of Where are the control handle and indicating...

Question 5

The current coils of the measuring instruments mounted on switchboards are rated at a maximum current capacity of ____________________ amperes.

Accepted Answer

The answer of The current coils of the measuring instruments...

Question 6

What is the significance of the scale readings on the instruments of most permanent switchboard installations being graduated to include the voltage and current transformer multipliers?

Accepted Answer

The answer of What is the significance of the scale...

Question 7

It is safe to open the secondary circuit of a current transformer when there is a current flow in the primary circuit.

Accepted Answer

It is not safe to open the secondary circuit of a current transformer when there is a current flow in the primary circuit as it can cause a high voltage spike and damage the equipment. The primary circuit should be opened first before the secondary circuit is opened.

Question 8

A(n) ____________________ circuit breaker is used because of the relatively high voltage of the alternator.

Accepted Answer

The answer of A(n) ____________________ circuit breaker is used because...

Question 9

How are the windings cooled in most small alternators?

Accepted Answer

The answer of How are the windings cooled in most...

Question 10

The voltage to the potential coils of instruments mounted on the switchboard should not exceed 120 to 125 volts.

Accepted Answer

This is the standard voltage limit for potential coils of instruments on a switchboard. Exceeding this limit may cause damage to the instruments or pose a safety hazard.

Question 11

In large utility generators, ____________________ is used for cooling the alternator core.

Accepted Answer

The answer of In large utility generators, ____________________ is used...

Question 12

In some generator systems, a large diode system is installed to prevent field charge damage.

Accepted Answer

A large diode system can be installed as a protective measure to prevent damage to the generator's field from excessive charge buildup.

Question 13

What does the low voltage at the instruments allow maintenance electricians to do?

Accepted Answer

The answer of What does the low voltage at the...

Question 14

What occurs if there is no system for discharging the field?

Accepted Answer

The answer of What occurs if there is no system...

Question 15

When alternators are connected so that they are separately excited, a(n) ____________________ must be used to deliver the DC power for field excitation to multiple generators.

Accepted Answer

The answer of When alternators are connected so that they...

Quiz 12: Wiring for Alternators

The electrical current flowing in the alternators through conductors produces heat in the coils because of I2 R losses.