Motors 3: Lesson 7 - Motor Alignment Flashcards
______ soft foot is a condition that exists when external forces are applied to the machine.
a. Angular
b. Induced
c. Parallel
d. Springing
______ misalignment is the situation where two shafts are parallel but are not on the same axis.
a. Angular
b. Nonparallel
c. Offset
d. Springing
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
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
Machined washers that are two to three times thicker than the original washer can be used to correct the dowel effect.
True or False
______ 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
When using the shaft-deflection method of measuring soft foot, the dial indicator may interfere with loosening the anchor bolts.
True or False
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
Readings on a dial indicator must begin at zero to determine total movement.
True or False
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”
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
The accuracy of ______ alignment is within 0.0002 inches.
a. dial
b. laser
c. reverse dial
d. straightedge
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
Jackscrews are used to make ______ movements of a machine to be shimmed (MTBS).
a. angular
b. horizontal
c. straightedge
d. vertical
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
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”
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
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”
A feeler gauge is more reliable than a taper gauge for measuring angular misalignment.
True or False
______ 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
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
With the electronic reverse dial method, thermal expansion compensation information can be entered into an alignment calculator.
True or False
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
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
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
Match the letter in the illustration to the bolt anchoring problem.
A -
B -
C -
D -
The alignment method shown is the ______ method.
a. laser rim-and-face
b. reverse dial
c. rim-and-face
d. straightedge
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
