A. Silver
B. Steel
C. Aluminium
D. Copper
Related Mcqs:
- The insulation between windings and grounded core and the insulation between the windings of the same phase is called__________________?
A. minor insulation
B. major insulation
C. either of the above
D. none of the above - In D.C. machines, the ________ in field mmf results in increase in size and cost of machines?
A. increase
B. decrease
C. either of the above
D. none of the above - Electrical machines having power outputs ranging from a few kW up to approximately 250 kW may be classified as_____________?
A. small size machines
B. medium size machines
C. large size machines
D. any of the above - Electrical machines having a power output up to about 750 W may be called__________machines?
A. small size
B. medium size
C. large size
D. any 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 - The weight of copper of both armature and field windings decreases with __________ in number of poles?
A. increase
B. decrease
C. either of the above
D. none of the above - A practical formula for determining the thickness of insulation between low voltage and high voltage windings is__________________?
A. 1 + 0.2 kVmm
B. 2 + 0.5 kVmm
C. 4 + 0.7 kV mm
D. 5 + 0.9 kV mm - Disc windings are primarily used in_____________-?
A. short capacity transformers
B. medium capacity transformers
C. high capacity transformers
D. any of the above - Multi-layer helical windings are commonly used in the transformers as high voltage windings_______________?
A. upto 20 kV
B. upto 50 kV
C. upto 80 kV
D. for 110 kV and above - Cylindrical windings using circular conductors, employed in transformers, are_____________?
A. single layered
B. double layered
C. multi-layered
D. none of the above
