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Recent questions tagged efficiency
A single-phase transformer has no-load loss of $64$ $W$,as obtained from an open-circuit test.when a short-circuit test is performed on it with $90$% of the rated current flowing in its both $LV$ and $HV$ winding,the measured loss is $81$ $W$.The transformer has maximum ... of the rated current. $64.0$ % of the rated current. $80.0$ % of the rated current. $88.8$ % of the rated current.
Feb 12, 2017
A $DC$ shunt generator delivers $45 A$ at a terminal voltage of $220 V$. The armature and the shunt field resistances are $0.01 \Omega$ and $44 \Omega$ respectively. The stray losses are $375 W$. The percentage efficiency of the $DC$ generator is _________.
Jan 30, 2017
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