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Electrical Machine Design - Interview Questions and Answers

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1. The heated parts of an electrical machine dissipate heat into their surroundings by which of the following modes of heat dissipation ?
A. Conduction
B. Convection
C. Radiation
D. All ofthe above
Explanation:
2. Multiple inlet system of air cooling of turbo-alternators can be used for machines of rating upto
A. 10 MW
B. 30 MW
C. 60 MW
D. 150 MW
Explanation:
3. The length cf air gap to be provided in ______ is primarily determined by power factor consideration.
A. d.c. series motor .
B. d.c. shunt motor
C. induction motor
D. synchronous motor
Explanation:
4. The density of hydrogen is _____ times the density of air.
A. 0.07
B. 1.5
C. 2.5
D. 3.5
Explanation:
5. Which ofthe following methods is used for air cooling of turbo-alternators ?
A. One sided axial ventilation
B. Two sided axial ventilation
C. Multiple inlet system
D. All ofthe above
Explanation:
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