Electrical Machine Design - Study Mode
[#86] Which of the following devices may be used for extending the range of instruments ?
Correct Answer
Shunts
[#87] The operating voltage of a meggar is about
Correct Answer
(D) 100 V
[#88] Which of the following brushes can be used for high values of current density ?
Correct Answer
(A) Metal graphite brushes
[#89] Which of the following is an advantage of hydrogen cooling?
Correct Answer
(D) All of the above
[#90] The insulation between windings and grounded core and the insulation between the windings of the same phase is
Correct Answer
(B) major insulation
Explanation
Solution: The insulation between windings and the grounded core, as well as the insulation between the windings of the same phase, is referred to as major insulation . Major insulation is designed to withstand higher voltage stresses as it separates the high-voltage components from the grounded core and ensures the safety and reliability of the electrical machine. In contrast, minor insulation is used for low voltage insulation, such as between adjacent turns in a winding, where the voltage stress is comparatively low. Therefore, Option B is the correct answer.