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.Management Sciences
Category: Electrical Machine Design
Which of the following is the major consideration to evolve a good design ?
A. Cost
B. Durability
C. Compliance with performance criteria as laid down in specifications
D. All of the above
The surge phenomenon is particularly important in case of_______________?
A. low voltage transformers
B. medium voltage transformers
C. high voltage transformers
D. any of the above
Materials exhibiting zero value of resistivity are known as ____________ ?
A. conductors
B. semiconductors
C. insulators
D. superconductors
The flash point of transformer oil should be higher than_______________?
A. 40°C
B. 60°C
C. 80°C
D. 104°C
impose limitation on design____________?
A. Saturation
B. Temperature rise
C. Efficiency
D. Power factor
E. All above
Machines cooled by direct cooling method may be called_____________?
A. “supercharged”
B. “inner cooled”
C. “conductor cooled”
D. any of the above
Dummy coil should not be used in_________________?
A. small machines
B. large machines
C. either A. or B.
D. none of the above
The efficiency of a machine should be as ____________ as possible to reduce the operating cost?
A. high
B. low
C. either of the above
D. none of the above
D.C. servomotors are used in______________?
A. purely D.C. control systems
B. purely AC. control systems
C. both D.C. and AC. control systems
D. none of the above
The slot leakage can be calculated by making which of the following assumptions ?
A. The current in the slot conductors is uniformly distributed over their cross-section
B. The leakage path is straight across the slot and around the iron at the bottom
C. The permanence of air paths is only considered. The reluctance of iron paths is assumed as zero
D. All of the above
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