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.Management Sciences
Category: Electrical Machine Design
Which of the following in an application of D.C. motors?
A. Traction
B. Drives for process industry
C. Battery driven vehicles
D. Automatic control
E. All of the above
Helical windings are used in________________?
A. distribution transformers
B. power transformers
C. shell type transformers
D. none of the above
By which of the following methods the temperature rise of windings and other parts may be determined ?
A. Thermometer method
B. Resistance method
C. Embedded temperature detector method
D. Any of the above
Which of the following is the basic consideration in the design of insulation ?
A. Electrical considerations
B. Mechanical considerations
C. Thermal considerations
D. All of the above
Tractive magnets are operated from____________?
A. a.c. supply
B. d.c. supply
C. either a.c. or d.c. supply
D. none of the above
Which of the following materials is used in the manufacture of resistance grids to be used in the starters of large motors ?
A. Copper
B. Aluminium
C. Steel
D. Cast-iron
The cold rolled grain oriented steel has ___________ permeability in the direction of the grain orientation?
A. minimum
B. maximum
C. nil
D. none of the above
The forced oil and air circulation method is usual one for transformers of capacities____________?
A. upto 5 MVA
B. upto 10 MVA
C. upto 20 MVA
D. 30 MVA upwards
Which of the following methods may be adopted to reduce the effects of armature reaction ?
A. Increase in length of air gap at pole tips
B. Increasing reluctance of pole tips
C. Compensating windings
D. Interpoles
E. All of the above
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