14177A NEETS 5 GENERATORS AND MOTORS Flashcards

1
Q

The majority of the motors used throughout the Navy are designed to operate on what?

A

AC

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2
Q

For motors that require variable speeds what is the best type of motor?

A

DC

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3
Q

What type of motors may be considered as polyphase motoros, of constant speed, whose rotors are energized with dc voltage?

A

Synchronous

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4
Q

Induction motors, single-phase or polyphase, whose rotors are energized by what, are the most commonly used AC motor?

A

Induction

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5
Q

What are the three basic types of AC motors?

A

Series, Synchronous, and Induction

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6
Q

What can be used to drive an AC series motor efficiently?

A

DC power

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7
Q

What type of motors are used for driving fans, electric drills, and other small appliances?

A

Series

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8
Q

What principle is the key to the operation of most AC motors?

A

Rotating magnetic fields

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9
Q

What type of motors are rarely used except in special-purpose equipment?

A

Two-phase

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10
Q

What type of motor cannot be started from a standstill by applying three-phase ac power to the stator?

A

Synchronous

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11
Q

What type of winding is added to the rotor of a synchronous motor to cause it to start?

A

Squirrel-cage

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12
Q

What is the most commonly used type of AC motor?

A

Induction

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13
Q

What type of motors are induction motors called?

A

Constant-speed

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14
Q

What is the least expensive, lowest maintenance type of of AC motor?

A

Single-phase AC induction

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15
Q

What type of motors are designed to use inductance, capacitance, or resistance to develop a starting torque?

A

Split-phase

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16
Q

The speed of induction motors is dependent on what?

A

Motor design

17
Q

Common synchronous speeds for 60hz motors are 3600, 1800, 1200, and how many rpm, depending on the number of poles in the original design?

A

900

18
Q

What is the difference between actual rotor speed and the synchronous speed in induction motors?

A

Slip