Test on Aircraft Electrical System Principles

Question 1: An electrical switch is derated from its nominal current rating solely when it is used in a high rush in circuit.

A. Ano

B. Ne

Explanation: An electrical switch is derated from its nominal current rating when it is a high rush in circuit or when circuits draw several times their rated current, such as DC motor circuits.

Question 2: An aircraft engine electric starter uses a parallel motor.

A. Ano

B. Ne

Explanation: An aircraft engine electric starter uses a series-wound motor.

Question 3: What kind of instrument would you use to measure very high resistance in an aircraft electrical system?

A. A voltmeter

B. An ammeter

C. A megohmmeter

D. A multimeter

Explanation: The study materials state that a megohmmeter is the instrument used to measure very high resistance. Megger is mentioned as the registered trade name for such an instrument.

Question 4: Based on the provided study materials, which of the following statements is true regarding the smallest size aluminum wire approved for use in aircraft electrical systems?

A. Two gage numbers larger than the smallest approved copper wire.

B. The study materials do not specify the smallest approved size.

C. It must be at least 10-gage aluminum wire.

D. It is the same gage number as the smallest approved copper wire.

Explanation: The study materials ask the question, 'What is the smallest size aluminum wire that is approved for use in aircraft electrical systems?' but they do not provide an answer. Therefore, based exclusively on the provided text, this information is not available.

Question 5: Reversing the connections to the shunt field coil with reference to the armature will reverse the direction of rotation of the armature of a DC shunt-wound electric motor.

A. Ano

B. Ne

Explanation: The direction of rotation of the armature of a DC shunt-wound electric motor can be reversed by reversing the connections to the shunt field coil with reference to the armature.