End Rings Design MCQs : This section focuses on the "End Rings Design". These Multiple Choice Questions (MCQs) should be practiced to improve the End Rings Design skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.
Question 1
Given the bars per pole is 6 and the current per bar is 20 A, what is the value of the maximum current in the end rings?
A. 60 A
B. 80 A
C. 90 A
D. 70 A
Question 2
How does the revolving field produce emf in the bars?
A. revolving field produces emf of fundamental frequency in the bars
B. revolving field produces emf of third frequency in the bars
C. revolving field produces emf of no frequency in the bars
D. revolving field produces emf of sinusoidal frequency in the bars
Question 3
How is the current density of the rotor bars chosen with respect to the end rings?
A. current density of rotor bars < current density of end rings
B. current density of rotor bars > current density of end rings
C. current density of rotor bars = current density of end rings
D. current density of rotor bars <= current density of end rings
Question 4
The value of the current density is chosen for the end rings such that the desired value of rotor resistance is obtained.
A. true
B. false
Question 5
What factors does the current in the bars depend on?
A. emfs, position of bars in magnetic field
B. instantaneous emfs, position of bars in magnetic field
C. emf
D. instantaneous emf
Question 6
What happens if the resistance of the end rings is negligible?
A. resistance coming in each current path is resistance of three bars
B. resistance coming in each current path is resistance of four bars
C. resistance coming in each current path is resistance of two bars
D. resistance coming in each current path is resistance of five bars
Question 7
What is the formula for the area of the ring?
A. area of the ring = depth of the end ring + thickness of the end ring
B. area of the ring = depth of the end ring – thickness of the end ring
C. area of the ring = depth of the end ring / thickness of the end ring
D. area of the ring = depth of the end ring * thickness of the end ring
Question 8
What is the formula for the maximum current in end ring, if the current in all bars are maximum at the same time?
A. maximum current in the end ring= bars per pole * 2 * current per bar
B. maximum current in the end ring= (bars per pole / 2) * current per bar
C. maximum current in the end ring= bars per pole / 2 / current per bar
D. maximum current in the end ring= bars per pole * 2 / current per bar
Question 9
What is the formula for the maximum current through each bar?
A. maximum value of the current through each bar = 2 * current through each bar
B. maximum value of the current through each bar = (2 * current through each bar)1/2
C. maximum value of the current through each bar = (2 * current through each bar)2
D. maximum value of the current through each bar = (2 * current through each bar)1/3
Question 10
What is the formula for the maximum value of current through end ring, when the current is not maximum in all the bars under one pole at the same time?
A. maximum current in end ring= (2*3.14) / (bars per pole/2*no of poles) * current per bar
B. maximum current in end ring= (2/3.14) * (bars per pole/2*no of poles) / current per bar
C. maximum current in end ring= (2*3.14) * (bars per pole/2*no of poles) * current per bar
D. maximum current in end ring= (2*3.14) / (bars per pole/2*no of poles) / current per bar
Question 11
What is the formula for the rms value of the end ring current?
A. rms value of end ring current = (bars per pole * current per bar) / (3.14*no of poles)
B. rms value of end ring current = (bars per pole * current per bar) * (3.14*no of poles)
C. rms value of end ring current = (bars per pole * current per bar) / (no of poles)
D. rms value of end ring current = (bars per pole * current per bar) / (3.14+no of poles)