The flash point of transformer oil should be higher than_______________?
The flash point of transformer oil should be higher than_______________?
A. 40°C
B. 60°C
C. 80°C
D. 104°C
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The noise produced by a ___________ cooled machine is less as the rotor moves in a medium of smaller density?
The noise produced by a ___________ cooled machine is less as the rotor moves in a medium of smaller density?A. air
B. hydrogen
C. either A. or B.
D. none of the aboveD.C. windings are____________?
D.C. windings are____________?A. sometimes 2-layer type
B. never 2-layer type
C. always 2-layer type
D. none of the aboveThe forced oil and air circulation method is usual one for transformers of capacities____________?
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____________are used for construction of core of electromagnets?
____________are used for construction of core of electromagnets?A. Soft magnetic materials
B. Hard magnetic materials
C. Either A. or B.
D. None of the aboveThe winding where dummy coils are used is sometimes called______________?
The winding where dummy coils are used is sometimes called______________?A. duplex winding
B. triplex winding
C. forced winding
D. none of the aboveWhich of the following is the major consideration to evolve a good 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