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ATT FC Test 10|119 Q’s and A’s
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ATT FC Test 10|119 Q’s and A’s
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ATT FC Test 10|119 Q’s and A’s2 Categories of Rotating Machinery - -Motors and Generators
- All rotating machinery have these: - -Rotating Shaft Mechanical in
Electrical out
- Why is AC Motor so popular? - -Readily Available
- Twisting Action - -Torque
- How is torque related to CEMF? - -Inversely
- Starting Current for DC Series motor is (greater/less) than for DC shunt - -
Greater
- Generates Rotor Current in an AC induction motor - -Stator Magnetic Field
- Has characteristics of both a series and/or shunt motor - -compound motor
- How is load proportional to RPM? CEMF? Armature Current? Torque? - -
Inversely, Inversely, Directly, Directly
- How is rotor speed proportional to CEMF? Torque? - -Directly, Indirectly
- DC motor converts (energy type) to (energy type) - -Electric DC Voltage to
Mechanical
- Torque is maximum when rotor is - -Locked
- AC motor input has 2 characteristics. What are they? - -AC, Sinusoidal
Wave
- Machinery that converts electrical energy to mechanical energy - -Motor
- Machinery that converts mechanical energy to electrical energy - -
Generator
- Motor Principle of magnetism - -Attraction and Repulsion
- Generator principle of magnetism - -Pass conductor through magnetic field
- Magnetic principle where a generator powers its own stators while
generating output - -Retentivity
, - Principle of AC induction motor operation - -Induction
- If schematic shows a field coil the motor is - -Electromagnetic
- If schematic does not show a field coil the motor is - -Permanent Magnet
- 2 Components of a motor are - -Poles and armatures
- Starting torque of a series motor is (greater/less) than a compound motor -
-Greater
- In PWM, the greater the "on" time, the (slower/faster) the motor speed - -
faster
- AC motors can be how many phases? - -3
- AC Generator, output reverses phase each (?) Degrees of rotation? - -180
- In a generator, how is output voltage proportional to shaft speed? - -
Directly
- What type of DC motor has armature current=field current and Vin=Vcoil-
armature - -Series
- Used for large HP/special purpose applications - -Synchronous
- How many types of compound motors? - -2
- Describes ratio of "on" time to "off" time - -Duty Cycle
- Loaded DC motor needs (greater/less) DCV to maintain output voltage - -
Greater
- Rotational Rate (RR)= - -Shaft Speed
- How is RR proportional to applied voltage? - -Directly
- Output power equation for DC shunt motor - -SpeedxTorquex.0147
- What causes DC compound motor to lose armature magnetic field? - -
Opposing series
- What causes DC compound motor to gain armature magnetic field? - -
Adding Series
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