A. electrical fault inside the transformer itself
B. electrical fault outside the transformer in outgoing feeder
C. for both outside and inside faults
D. none of the above
Related Mcqs:
- A Buchholz relay can be installed on______________?
A Buchholz relay can be installed on
A. auto-transformers
B. air-cooled transformers
C. welding transformers
D. oil cooled transformers - Which of the following protection is normally not provided on small distribution transformers ?
A. Overfluxing protection
B. Buchholz relay
C. Overcurrent protection
D. All of the above - Which of the following acts as a protection against high voltage surges due to lightning and switching ?
A. Horn gaps
B. Thermal overload relays
C. Breather
D. Conservator - The degree of mechanical vibrations produced by the laminations of a transformer depends on____________?
A. tightness of clamping
B. gauge of laminations
C. size of laminations
D. all 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 - The chemical used in breather is_______________?
A. asbestos fiber
B. silica sand
C. sodium chloride
D. silica gel - Delta/star transformer works satisfactorily when______________?
A. load is balanced only
B. load is unbalanced only
C. on balanced as well as unbalanced loads
D. none of the above - 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. - In a given transformer for a given applied voltage, losses which remain constant irrespective of load changes are__________?
A. hysteresis and eddy current losses
B. friction and windage losses
C. copper losses
D. none of the above
