Transformer: [ ISRO,DRDO,DMRC,SAIL, ODNANCE, HAL, WBSEDCL, RAILWAY
& Others competitive]
31. The higher voltage for transmitting electrical power in India is….(ISRO, ORDNANCE , DMRC , DRDO Repeated )
1.33 kV
2.66 kV
3.132 kV
4.400 kV
32. In a transformer the resistance between its primary and secondary is.. [ Very very important ]
1.zero
2.1 Ω
3.1000 Ω
4.Infinite
33. A transformer oil must be free from….
1.sludge
2. alkaline
3.gases
4. moisture
34. A Buchholz relay can be installed on..
1.auto-transformers
2.air-cooled transformers
3.welding transformers
4.oil-cooled transformers
35. Gas is usually not liberated due to dissociation of transformer oil unless the oil temperature exceeds..
1.500C
2.800C
3.1000C
4.1500C
36.The main reason for generation of harmonics in a transformer could be…
1.fluctuating load
2.poor insulation
3.mechanical vibrations
4. saturation of core
37.Distribution transformers are generally designed for maximum efficiency around.…(ISRO, ORDNANCE , DMRC , DRDO Repeated )
1.90% load
2.zero load
3.25% load
450% load
38. Which of the following properties is not necessarily desirable in the material for transformer core?
1.Mechanical strength
2.Low hysteresis loss
3.High thermal conductivity
4.High permeability
39. Helical coils can be used on… [ Very very important ]
1.low voltage side of high kVA transformers
2.high frequency transformers
3.high voltage side of small capacity transformers
4.high voltage side of high kVA rating transformers
40. High frequency transformers sometimes make use of ferrite cores because it has
1.high specific gravity
2. high resistance
3.high hysteresis
4.low permeability
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