Question
Consider the table given :
| Constructional feature |
Machine type |
Mitigation |
| P. Damper bars |
S. Induction motor |
X. Hunting |
| Q. Skewed rotor slots |
T. Transformer |
Y. Magnetic locking |
| R. Compensating winding |
U. Synchronous machine |
Z. Armature reaction |
| V. DC machine |
The correct combination that relates the constructional feature, machine type and mitigation is
Options :
P-V-X, Q-U-Z, R-T-Y
P-U-X, Q-S-Y, R-V-Z
P-T-Y, Q-V-Z, R-S-X
P-U-X, Q-V-Y, R-T-Z
Answer :
P-U-X, Q-S-Y, R-V-Z
Solution :
(i) Damper bars are used in synchronous machines to eliminate hunting (P-U- X)
(ii) Skewed rotor slots are used in induction machine to reduce magnetic locking (cogging) (Q-S-Y)
(iii)Compensating winding is used in DC machine to neutralize armature reaction (R-V-Z) .
Hence, the correct option is (B).
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