Motors 3: Lesson 7 - Motor Alignment

Question 1

______ soft foot is a condition that exists when external forces are applied to the machine.

a. Angular
b. Induced
c. Parallel
d. Springing

Question 2

______ misalignment is the situation where two shafts are parallel but are not on the same axis.

a. Angular
b. Nonparallel
c. Offset
d. Springing

Question 3

The ______ alignment method uses two dial indicators to take readings of opposing sides of coupling rims, giving two sets of shaft runout readings.

a. coupling
b. laser rim-and-face
c. reverse dial
d. rim-and-face

Question 4

Rough handling of a machine or uneven mounting pads due to poor machining or welding often causes ______ soft foot.

a. angular
b. induced
c. parallel
d. springing

Question 5

Machined washers that are two to three times thicker than the original washer can be used to correct the dowel effect.

True or False

Question 6

______ soft foot is prevented by using clean, solid bases with all paint, grime, rust, and corrosion thoroughly removed.

a. Angular
b. Induced
c. Parallel
d. Springing

Question 7

When using the shaft-deflection method of measuring soft foot, the dial indicator may interfere with loosening the anchor bolts.

True or False

Question 8

Temperature changes resulting in thermal expansion may be caused by the ______.

a. heat from a loaded motor
b. high ambient (room) temperature
c. temperature of the pumped product
d. all of the above

Question 9

Readings on a dial indicator must begin at zero to determine total movement.

True or False

Question 10

If the beginning reading on a dial indicator is 0.018 inches and the end reading is -0.003 inches, then the total indicator reading is ______.

a. -0.021”
b. -0.015”
c. 0.015”
d. 0.021”

Question 11

The first adjustment when performing shaft alignment should be ______.

a. angular alignment in the horizontal plane
b. angular alignment in the vertical plane
c. parallel alignment in the horizontal plane
d. parallel alignment in the vertical plane

Question 12

The accuracy of ______ alignment is within 0.0002 inches.

a. dial
b. laser
c. reverse dial
d. straightedge

Question 13

The machine to be shimmed (MTBS) is chosen because it is ______.

a. attached to plumbing
b. easier to move
c. higher than the stationary machine (SM)
d. all of the above

Question 14

Jackscrews are used to make ______ movements of a machine to be shimmed (MTBS).

a. angular
b. horizontal
c. straightedge
d. vertical

Question 15

The last adjustment when performing shaft alignment should be ______.

a. angular alignment in the horizontal plane
b. angular alignment in the vertical plane
c. parallel alignment in the horizontal plane
d. parallel alignment in the vertical plane

Question 16

If gap misalignment at five inches from zero is 0.063 inches and mounting holes on the motor are nine inches apart, then shim thickness at the motor is ______.

a. 0.035”
b. 0.113”
c. 1.315”
d. 2.835”

Question 17

All anchor bolts can be loosened and both machines shifted to try to align two machines if sufficient movement is not available at the machine to be shimmed.

True or False

Question 18

With rim-and-face alignment, the face reading on a dial indicator at 3:00 is -0.018 inches and the face reading at 9:00 is 0.034 inches. The horizontal offset is ______.

a. -0.026”
b. -0.016”
c. 0.016”
d. 0.052”

Question 19

A feeler gauge is more reliable than a taper gauge for measuring angular misalignment.

True or False

Question 20

______ misalignment must not exceed 1/2° and may be corrected using a level placed on top of the pulley parallel with the pulley shaft.

a. Angular
b. Offset
c. Parallel
d. All of the above

Question 21

To take ______ readings, the coupling must be disconnected and both coupling halves rotated together.

a. angular
b. nonparallel
c. reverse dial
d. rim-and-face

Question 22

With the electronic reverse dial method, thermal expansion compensation information can be entered into an alignment calculator.

True or False

Question 23

Induced soft foot 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.

True or False

Question 24

A(n) ______ is a rigid steel support for firmly coupling and aligning two or more rotating devices.

a. anchor
b. base plate
c. dowel
d. foundation

Question 25

A drilled and tapped base plate that is used to anchor a machine must have a thickness that is a minimum of ______ times the root diameter of the anchoring bolts.

a. 1/2
b. 11/2
c. 10
d. 20

Question 26

Match the letter in the illustration to the bolt anchoring problem.

A -
B -
C -
D -

Question 27

The alignment method shown is the ______ method.

a. laser rim-and-face
b. reverse dial
c. rim-and-face
d. straightedge

Question 28

A motor and pump operating at 1,800 revolutions per minute are being aligned with five-inch couplings. The measured offset is 0.002 inches. The measured horizontal angularity is 0.003 inches, and the measured vertical angularity is 0.004 inches. From the illustration, the maximum acceptable angularity can be determined. The alignment is within tolerances.

True or False