Search
.Management Sciences
Category: Electrical Machine Design
The input impedance of a JFET is _____________that of an ordinary transistor?
0
A. equal to
B. less than
C. more than
D. none of the above
In _________ machines, the size of the shaft is decided by the critical speed which depends on the deflection of the shaft?
A. small
B. medium
C. large
D. any of the above.
With direct water cooling it is possible to have ratings of about_____________?
A. 200 MW
B. 300 MW
C. 400 MW
D. 600 MW
Direct water cooling of rotor winding presents_____________?
A. no mechanical difficulties
B. lesser mechanical difficulties
C. greater mechanical difficulties
D. none 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
In direct cooled system using hydrogen both stator and rotor conductors are made____________?
A. solid
B. hollow
C. perforated
D. any ofthe 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
The winding where dummy coils are used is sometimes called______________?
A. duplex winding
B. triplex winding
C. forced winding
D. none of the above
If an insulating material is operated beyond the maximum allowable temperature, its life is_____________?
A. drastically increased
B. drastically reduced
C. unaffected
D. none of the above
Cylindrical windings using circular conductors, employed in transformers, are_____________?
A. single layered
B. double layered
C. multi-layered
D. none of the above
Recent Comments