461. Which of the following protection is normally not provided on small distribution transformers ?
A. Over fluxing protection
B. Buchholz relay
C. Overcurrent protection
D. All of the above
462. A good voltage regulation of a transformer means________________?
A. output voltage fluctuation from no load to full load is least
B. output voltage fluctuation with power factor is least
C. difference between primary and secondary voltage is least
D. difference between primary and secondary voltage is maximum
463. 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
464. The efficiency of two identical transformers under load conditions can be determined by_______________?
A. short-circuit test
B. back-to-back test
C. open circuit test
D. any of the above
465. Which of the following insulating materials can withstand the highest temperature safely ?
A. Cellulose
B. Asbestos
C. Mica
D. Glass fiber
466. Which of the following parts of a transformer is visible from outside ?
A. Bushings
B. Core
C. Primary winding
D. Secondary winding
467. The noise produced by a transformer is termed as_______________________?
A. zoom
B. hum
C. ringing
D. buzz
468. 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
469. In a power or distribution transformer about 10 per cent end turns are heavily insulated__________?
A. to withstand the high voltage drop due to line surge produced by the shunting capacitance of the end turns
B. to absorb the line surge voltage and save the winding of transformer from damage
C. to reflect the line surge and save the winding of a transformer from damage
D. none of the above
470. For given applied voltage, with the increase in frequency of the applied voltage?
A. eddy current loss will decrease
B. eddy current loss will increase
C. eddy current loss will remain unchanged
D. none of the above
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