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Electrical Machines-Transformer MCQ-3 Question 11:-
On no-load phasor diagram of transformer, the core loss component of the current remains in phase with
[R.G.T.U. Dec., 2006]
(a) no-load current.
(b) primary supply voltage.
(c) core flux.
(d) primary induced voltage.
Electrical Machines-Transformer MCQ Question 12:-
In a transformer, the exciting current will be in phase quadrature with the impressed voltage provided
(a) only the leakage impedance drop is ignored.
(b) only the core loss is ignored.
(c) both the leakage impedance drop and the core loss are ignored.
(d) only the no-load copper loss is ignored.
Electrical Machines-Transformer MCQ Question 13:-
In a transformer core, third and fifth harmonic components of fluxes are respectively 10% and 4% of the fundamental flux. The third and fifth harmonic induced emfs in the winding, in terms of the fundamental induced emfs are respectively
[U.P.S.C. LE.S. E.E.-II, 2001]
(a) 30%, 20%
(b) 10%, 12%
(c) 50%, 20%
(d) 50%, 12%
Electrical Machines-Transformer MCQ Question 14:-
The flux in transformer core
(a) increases with load.
(b) decreases with load,
(c) remains constant irrespective of load.
(d) none of the above.
Electrical Machines-Transformer MCQ Question 15:-
The primary ampere-turns are counter balanced by
(a) secondary ampere-turns.
(c) increase in mutual flux.
(b) primary flux.
(d) increase in secondary current.
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