is usually used for brush rockers____________?
is usually used for brush rockers____________?
A. Mild steel
B. Copper
C. Aluminium
D. Cast-iron
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D.C. machines designed with a large value of air gap length have_____________?
D.C. machines designed with a large value of air gap length have_____________?A. worst, ventilation
B. poor ventilation
C. better ventilation
D. none of the abovecooling is the process of dissipating the armature and field winding losses to a cooling medium circulating within the winding insulation wall______________?
cooling is the process of dissipating the armature and field winding losses to a cooling medium circulating within the winding insulation wall______________?A. Direct
B. Indirect
C. Conventional
D. Any of the aboveThe design of electromagnets is based upon which of the following fundamental equations ?
The design of electromagnets is based upon which of the following fundamental equations ?A. Force equation
B. Magnetic circuit equation
C. Heating equation
D. Voltage equation
E. All of the aboveIn D.C. machines the width of the duct is usually_____________?
In D.C. machines the width of the duct is usually_____________?A. 4 mm
B. 6 mm
C. 8 mm
D. 10 mmIn D.C. machines, the ________ in field mmf results in increase in size and cost of machines?
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 aboveThe cold rolled grain oriented steel has ___________ permeability in the direction of the grain orientation?
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