Description : Which of the following methods should be used to test for an 'open' coil in an AC motor stator? A. Test with an ohmmeter, one test lead on the shaft, and the other test lead to the stator leads ... an open coil. D. Use a growler, listening for noise and vibration to increase when over an open coil.
Last Answer : Answer: B
Description : A testing device called a 'growler' is being used to locate a shorted coil in the stator of an AC electrical machine. When the 'feeler' is moved over a slot containing the shorted coil _____________. ... . the meter needle will be deflected to zero D. the meter needle will be deflected to full-scale
Last Answer : Answer: A
Description : A shading coil used in an AC magnetic controller, functions to _____________. A. reduce vibration and noise in the contactor B. prevent flux buildup in the operating coil C. eliminate arcing when the contacts close D. energize the operating coil and 'pull in' the contacts
Description : __________ cannot control the noise pollution. (A) Use of silencers (B) Green house gases (C) Vibration damping (D) Tree plantation
Last Answer : (B) Green house gases
Description : Following is advantage of hyperbolic design a) Less initial cost b) Less noise c) Less vibration d) All above
Last Answer : b) Less noise
Description : What are the possible causes of excessive vibration or noise in a steam turbine?
Last Answer : 1. Misalignment. 2. Worn bearings. 3. Worn coupling to driven machine. 4. Unbalanced coupling to driven machine. 5. Unbalanced wheel. 6. Piping strain. 7. Bent shaft.
Description : How can problems of "excessive vibration or noise" due to piping strain be avoided on steam turbines?
Last Answer : 1. The inlet as well as exhaust steam lines should be firmly supported to avoid strains from being imposed on the turbine. 2. Adequate allowance should be made for expansion of steam pipes due to heat.
Description : Wind load analysis can be performed following methods. a) experiments wind pressure coefficient b) shape factors c) wind-induced vibration coefficient d) all of above
Last Answer : all of above
Description : Reference temperature use in noise analysis A. 75 K B. 250 K C. 290 K D. 300 K
Last Answer : C. 290 K
Description : Noise level audible to audience sitting in the 5th row from the stage during a large orchestra show corresponds to about __________ decibels. (A) 105 (B) 135 (C) 160 (D) 185
Last Answer : (B) 135
Description : Coverage based analysis is best described as: A. A metric used to show the logic covered during a test session providing insight to the extent of testing. B. A tool for documenting the unique ... their status through to resolution. D. The most traditional means for analyzing a system or a program
Last Answer : A. A metric used to show the logic covered during a test session providing insight to the extent of testing.