Related Questions

________ 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
The ratio of the temperature rise of cooling water to the vacuum temperature minus inlet cooling water temperature is called
A Condenser efficiency
B Vacuum efficiency
C Nozzle efficiency
D Boiler efficiency
Some wire- wound resistors have bifilar winding. This type of winding is used to
A Increase the thermal stability
B Reduce the tolerance
C Reduce the inductance of winding
D Double the power rating of the resistor
In a three-phase induction motor, the number of poles in the rotor winding is always
A Zero
B More than the number of poles in stator
C Less than number of poles in stator
D Equal to number of poles in stator
In which single-phase motor, the rotor has no teeth or winding ?
A Split phase motor
B Reluctance motor
C Hysteresis motor
D Universal motor
Gas cooling as compared to water cooling of nuclear reactors
A Can not attain a high temperature
B Is more efficient as gas has a higher specific heat
C Can produce only saturated steam for feeding to power turbine
D None of these
Minimum temperature upto which water can be theoretically cooled down in the cooling tower by evaporative cooling is equal to the __________ temperature of air.
A Wet bulb
B Dry bulb
C Saturation
D Dew point
The cooling effect in a cooling tower can not be increased by
A Increasing the air velocity over the wet surfaces
B Reducing the humidity of entering air
C Lowering the barometric pressure
D None of these
Transformers with a capacity of up to _____ have a cooling radiator system with natural cooling
A 2 MVA
B 5 MVA
C 7.5 MVA
D 10 MVA
In self cooled motors the cooling time constant is about ______ than the heating time constant because cooling conditions are worse at standstill.
A 2 to 3 times greater
B 3 to 4 times greater
C 4 to 5 times greater
D none of the above

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