The core used in high frequency transformer is usually___________?
A. copper core
B. cost iron core
C. air core
D. mild steel core
The core used in high frequency transformer is usually___________? Read More »
TransformersIn a transformer the resistance between its primary and secondary is____________?
A. zero
B. 1 ohm
C. 1000 ohms
D. infinite
In a transformer the resistance between its primary and secondary is____________? Read More »
TransformersHarmonics in transformer result in___________?
A. increased core losses
B. increased I2R losses
C. magnetic interference with communication circuits
D. all of the above
Harmonics in transformer result in___________? Read More »
TransformersHelical coils can be used on___________?
A. low voltage side of high kVA transformers
B. high frequency transformers
C. high voltage side of small capacity transformers
D. high voltage side of high kVA rating transformers
Helical coils can be used on___________? Read More »
TransformersThe function of conservator in a transformer is___________________?
A. to project against’internal fault
B. to reduce copper as well as core losses
C. to cool the transformer oil
D. to take care of the expansion and contraction of transformer oil due to variation of temperature of sur-roundings
The function of conservator in a transformer is___________________? Read More »
TransformersThe thickness of laminations used in a transformer is usually____________?
A. 0.4 mm to 0.5 mm
B. 4 mm to 5 mm
C. 14 mm to 15 mm
D. 25 mm to 40 mm
The thickness of laminations used in a transformer is usually____________? Read More »
TransformersMaterial used for construction of transformer core is usually___________________?
A. wood
B. copper
C. aluminium
D. silicon steel
Material used for construction of transformer core is usually___________________? Read More »
TransformersHysteresis loss in a transformer varies as CBmax = maximum flux density) ?
A. Bmax
B. Bmax1-6
C. Bmax1-83
D. B max
Hysteresis loss in a transformer varies as CBmax = maximum flux density) ? Read More »
TransformersThe noise resulting from vibrations of laminations set by magnetic forces, is termed as_________________?
A. magnetostrication
B. boo
C. hum
D. zoom
The transformer ratings are usually expressed in terms of______________?
A. volts
B. amperes
C. kW
D. kVA
The transformer ratings are usually expressed in terms of______________? Read More »
Transformers