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electricmotorsexam > Chapter 15 -18 INCLASS > Flashcards

Chapter 15 -18 INCLASS Flashcards

1
Q

The only method of measuring soft foot is the shaft deflection method

A

F

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2
Q

A foundation is a rigid steel support for firmly coupling and aligning two or more rotating devices

A

F

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3
Q

Total indicator readings are found by subtracting one reading from the other reading and taking the absolute value of the difference

A

T

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4
Q

Press fit is a method of bearing installation where the diameter of the outer fixed ring is smaller than the diameter of the bearing housing and the ring can be pushed in by hand.

A

F

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5
Q

A pulley system depends on friction between the V-belt and the sheave.

A

T

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6
Q

A troubleshooter can observe the burning and opening of the first few turns of windings, which occur when when a motor has failed due to a voltage surge.

A

T

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7
Q

Common causes of motor over-cycling from improper maintenance include misalignment, vibration, and improper belt tension

A

F

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8
Q

Single phasing is the minimum condition of voltage unbalance

A

F

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9
Q

Most problems with the three-phase motors involve the centrifugal switch, thermal switch, or capacitor.

A

F

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10
Q

Bearings guide and position moving parts to reduce friction, vibration, and temperature.

A

T

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11
Q

_________ misalignment is misalignment where two pulleys or shafts are not parallel.
a. Rim-and-Face b. Offset c. Nonparallel d. Angular

A

c. Non Parallel

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12
Q

The ______________ is a condition that exists when the bolt hole of a machine is so large that the bolt head forces the washer into the hole opening on an angle.
a. Excess bolt body effect b. Anchoring effect c. Dowel effect
d. Bolt bound effect

A

c. Dowel effect

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13
Q

___________ damage is bearing damage where applied force exceeds the yield strength of the surface and presses the balls into the surface to cause indentations.
a. Spalling b. Brinell c. Thrust d. False Brinell

A

b. Brinell

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14
Q

A ________________ belt is a flat belt containing gear teeth that are used for synchronous drive systems.
a. Gear tooth b. Conveyor c. Timing d. None of the above

A

c. Timing

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15
Q

A ______________ is the bearing surface of a rolling-contact bearing that supports the rolling elements.
a. Cage b. Flange c. Race d. None of the above

A

c. Race

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16
Q

A _______________ is inserted through a block attached to a baseplate and is used to move a machine horizontally.
a. Shim b. Ball Screw c. Jackscrew d. Wedge

A

c. Jackscrew

17
Q

A_______________ gear is a gear with straight tapered teeth used in applications where shaft axes intersect.
a. Worm b. Rack and pinion c. Herringbone
d. Bevel

A

d. Bevel

18
Q

______________ happens as current passes from its introduction, such as an electrical system feedback or welding currents, to a grounded connection.
a. Electroplating b. Voltage drop c. Discharging
d. Electrical pitting

A

d. Electrical pitting

19
Q

A _____________ is a device that joins two precisely aligned shafts within a common frame.
a. Flexible coupling b. Timing belt c. Chain drive
d. Rigid Coupling

A

d. Rigid Coupling

20
Q

Motor manufacturers have found that ________________ is one of the most common causes of motor failure.
a. Bearing loss b. Overcycling c. Spalling d. Overloading

A

d. Overloading

21
Q

The adjustment to eliminate angular misalignment in the horizontal plane is based on the _________________.
a. Distance between the front and back MTBS mounting holes
b. diameter of the coupling c. horizontal angular gap
d. all of the above

A

d. All of the above

22
Q

A(n) ________________ load is a load applied perpendicular to the rotating shaft, straight through the ball toward the center of the shaft.
a. Axial b. Compound c. Radial d. Thrust

A

c. Radial

23
Q

A(n) __________________ load, or thrust load, is a load applied parallel to the rotating shaft.

A

Axial

24
Q

Typical types of ________________ are an open circuit, a short circuit, or a short to ground.

A

Circuit Faults

25
Q

______________ bearings do not require lubrication

A

Sealed

26
Q

________________ tension is the tension on a belt when it is approaching the driven pulley.

A

Slack-side

27
Q

________________ soft foot is a condition that exists when one machine foot is bent and not on the same plane as the other feet.

A

Angular

28
Q

A(n) ____________ bearing is a rolling-contact roller-type bearing with long rollers of small diameter.

A

Needle

29
Q

________________ is the process of turning a motor ON and OFF more often than the motor design allows.

A

Overcycling

30
Q

A(n) _______________ is a coupling between a motor and a load that connects or disconnects the motor shaft to a drive shaft while the motor is running

A

Clutch

31
Q

_________________ is the process where the center lines of two machine shafts are placed within specified tolerances.

A

Alignment

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