The transformer oil should have _____ volatility and _____ viscosity.
A. low,low
B. high,high
C. low,high
D. high,low
Answer: Option A
This Question Belongs to Electrical Engineering >> Transformers
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The purpose of providing an iron core in a transformer is to
A. provide support to windings
B. reduce hysteresis loss
C. decrease the reluctance of the magnetic path
D. reduce eddy current losses
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
If the percentage impedances of the two transformers working in parallel are different, then
A. transformers will be overheated
B. power factors of both the transformers will be same
C. parallel operation will be not possible
D. parallel operation will still be possible, but the power factors at which the two transformers operate will be different from the power factor of the common load
An ideal transformer will have maximum efficiency at a load such that
A. copper loss = iron loss
B. copper loss < iron loss
C. copper loss > iron loss
D. none of the above
Viscocity Definition : the state of being thick, sticky, and semi-fluid in consistency, due to internal friction.
"cooling the fluid raises its viscosity"
a quantity expressing the magnitude of internal friction in a fluid, as measured by the force per unit area resisting uniform flow.
tendency of a substance to evaporate at normal temperatures.
"the volatility of chemicals in an indoor environment"
Transformer oil has a low viscosity and low volatility with good gas absorbing properties, while It resists oxidation, slugging, and emulsification with water. Viscosity is the resistance of flow, in normal condition.