A. the current on secondary side is negligible
B. the voltage on secondary side does not vary
C. the voltage applied on primary side is low
D. full-load current is not supplied to the transformer
Transformers
No-load on a transformer is carried out to determine______________?
A. copper loss
B. magnetising current
C. magnetising current and loss
D. efficiency of the transformer
Which of the following parts of a transformer is visible from outside ?
A. Bushings
B. Core
C. Primary winding
D. Secondary winding
The transformer oil should have _______ volatility and _______ viscosity?
A. low,low
B. high,high
C. low,high
D. high,low
For the parallel operation of single phase transformers it is necessary that they should have___________?
A. same efficiency
B. same polarity
C. same kVA rating
D. same number of turns on the secondary side.
The dielectric strength of transformer oil is expected to be______________?
A. lkV
B. 33 kV
C. 100 kV
D. 330 kV
In a given transformer for given applied voltage, losses which remain constant irrespective of load changes are______________?
A. friction and windage losses
B. copper losses
C. hysteresis and eddy current losses
D. none of the above
A transformer transforms__________________?
A. voltage
B. current
C. power
D. frequency
Transformer breaths in when_______________?
A. load on it increases
B. load on it decreases
C. load remains constant
D. none of the above
Reduction in core losses and increase in permeability are obtained with transformer employing__________?
A. core built-up of laminations of cold rolled grain oriented steel
B. core built-up of laminations of hot rolled sheet
C. either of the above
D. none of the above
