A. primary turns to secondary turns
B. secondary current to primary current
C. secondary induced e.m.f. to primary induced e.m.f
D. secondary terminal voltage to primary applied voltage
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Related Mcqs:
- If R2 is the resistance of secondary winding of the transformer and K is the transformation ratio then the equivalent secondary resistance referred to primary will be___________?
- A. R2/VK B. R2IK2 C. R22!K2 D. R22/K...
- Auto-transformer makes effective saving on copper and copper losses, when its transformation ratio is_________________?
- A. approximately equal to one B. less than one C. great than one D. none of the above...
- Which of the following is the main advantage of an auto-transformer over a two winding transformer?
- A. Hysteresis losses are reduced B. Saving in winding material C. Copper losses are negligible D. Eddy losses are totally eliminated...
- The changes in volume of transformer cooling oil due to variation of atmospheric temperature during day and night is taken care of by which part of transformer?
- A. Conservator B. Breather C. Bushings D. Buchholz relay...
- A transformer cannot raise or lower the voltage of a D.C. supply because_______________?
- A. there is no need to change the D.C. voltage B. a D.C. circuit has more losses C. Faraday’s laws of electromagnetic induction are not valid since the rate of change of flux is zero D. none of the above...
- The no load current in a transformer lags behind the applied voltage by an angle of about_____________?
- A. 180° B. 120″ C. 90° D. 75°...
- When a given transformer is run at its rated voltage but reduced frequency, its____________?
- A. flux density remains unaffected B. iron losses are reduced C. core flux density is reduced D. core flux density is increased...
- A transformer can have zero voltage regulation at______________?
- A. leading power factor B. lagging power factor C. unity power factor D. zero power factor...
- If a transformer is switched on to a voltage more than the rated voltage______________?
- A. its power factor will deteriorate B. its power factor will increase C. its power factor will remain unaffected D. its power factor will be zero...
- 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...
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