Machines cooled by direct cooling method may be called_____________?
(A) “supercharged”
(B) “inner cooled”
(C) “conductor cooled”
(D) any of the above
Which of the following is an advantage of hydrogen cooling ?
(A) Increase in efficiency
(B) Increase in ratings
(C) Increase in life
(D) Smaller size of coolers
(D) All of the above
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 of the above
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 above
With conventional hydrogen cooling it is possible to increase the rating of a single unit to___________?
(A) 50 MW
(B) 100 MW
(C) 200 MW
(D) none of the above
By which of the following methods motor rating for variable load drives can be determined ?
(A) Method of average losses
(B) Equivalent current method
(C) Equivalent torque method
(D) Equivalent power method
(D) All of the above
The value of exciting or magnetizing current depends upon which of the following factors ?
(A) Total m.m.f. required
(B) The number of turns in the exciting winding
(C) The way in which the winding is distributed
(D) All 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