Aircraft Electricity and Electronics: Study Guide, Sixth Edition by Eismin Thomas K

Author:Eismin, Thomas K.
Language: eng
Format: epub
Tags: -
Publisher: McGraw-Hill Education
Published: 2014-02-16T16:00:00+00:00

MULTIPLE-CHOICE QUESTIONS

Circle the letter of the best answer.

1. Which of the following is true concerning a thermal protector for a motor?

a. The thermal protector replaces the circuit breaker for the motor.

b. The thermal protector will open the motor’s circuit during an overload condition.

c. A thermal protector is used only on a dc motor.

d. A thermal protector is used only on an ac motor.

2. Which of the following is a true statement concerning split-phase motors?

a. They are dc motors.

b. They are commonly used for starter motors.

c. They are ac motors.

d. They are reversible motors.

3. Some electric motors have two sets of field windings wound in opposite directions so that the

a. speed of the motor can be more closely controlled.

b. power output of the motor can be more closely controlled.

c. motor can be operated at any speed within its rated range without a change in power output.

d. motor can be operated in either direction.

4. What type of dc motor is commonly referred to as a constant-speed motor?

a. Series-wound motor

b. Synchronous motor

c. Shunt-wound motor

d. Universal motor

5. One purpose of a growler test is to determine the presence of

a. an out-of-round commutator.

b. a broken field lead.

c. a shorted armature.

d. a short from F+ to A–.

6. What are the general types of ac motors used in aircraft systems?

a. Induction and synchronous

b. Shaded pole and universal

c. AC series and capacitor start

d. Rheostat series and condenser start

7. The speed of a synchronous ac motor is determined by what characteristic of the motor circuit?

a. The voltage of the circuit

b. The current flow of the circuit

c. The frequency of the applied voltage

d. The resistance of the motor circuit

8. What type of aircraft utilizes three-phase ac motors?

a. Light single-engine aircraft

b. Light twin-engine aircraft

c. Large transport-category aircraft

d. Turboprop commuter aircraft

9. How can the direction of rotation of a typical dc electric motor be changed?

a. Interchange the wires that connect the motor to the external power source.

b. Reverse the electrical connections to either the field or armature windings.

c. Rotate the brush assembly 90°.

d. Remove the starting winding.

10. A certain dc series motor mounted within an aircraft draws more amperes during start than when it is running under its rated load. The most logical conclusion that may be drawn is that

a. the starting winding is shorted.

b. the brushes are floating at operating rpm because of weak brush springs.

c. the condition is normal for this type of motor.

d. hysteresis losses have become excessive through armature bushing (or bearing) wear.

11. What type of electric motor is generally used to start the engine of a typical light aircraft?

a. DC shunt-wound motor

b. DC series-wound motor

c. DC compound-wound motor

d. Synchronous motor

12. What occurs when the like poles of two different magnets are brought close to each other?

a. The like poles attract.

b. The like poles repel.

c. A voltage is produced.

d. Eddy currents are produced.

13. The direction in which a wire carrying current will move when acted on by a magnetic field is determined by which of the following?

a. The electron theory

b. The right-hand motor rule

c. The left-hand motor rule

d. The magnetic motor rule

14.

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