GATE EE 2006 | GATE EE Year Wise Previous Years Questions

GATE EE 2006

MCQ (Single Correct Answer)

-0.6

A $$300$$ $$kVA$$ transformer has $$95\% $$ efficiency at full load $$0.8$$ $$pf$$ lagging and $$96\% $$ efficiency at half load, unity $$pf.$$

What is the maximum efficiency (in %) at unity $$pf$$ load?

$$95.1$$

$$96.2$$

$$96.4$$

$$98.1$$

GATE EE 2006

MCQ (Single Correct Answer)

-0.6

Two transformers are to be operated in parallel such that they share load in proportion to their $$kVA$$ ratings. The rating of the first transformer is $$500$$ $$kVA$$ and its $$pu$$ leakage impedance is $$0.05$$ $$pu.$$ If the rating of second transformer is $$250$$ $$kVA,$$ its $$pu$$ leakage impedance is

$$0.20$$

$$0.10$$

$$0.25$$

$$0.025$$

GATE EE 2006

MCQ (Single Correct Answer)

-0.6

A $$300$$ $$kVA$$ transformer has $$95\% $$ efficiency at full load $$0.8$$ $$pf$$ lagging and $$96\% $$ efficiency at half load, unity $$pf.$$

The iron loss $$\left( {{P_i}} \right)$$ in $$kW,$$ under full load operation are

$${P_c} = 4.12,\,\,{P_i} = 8.51$$

$${P_c} = 6.59,\,\,{P_i} = 9.21$$

$${P_c} = 8.51,\,\,{P_i} = 4.12$$

$${P_c} = 12.72,\,\,{P_i} = 3.07$$

GATE EE 2006

MCQ (Single Correct Answer)

-0.3

In transformers, which of the following statements is valid?

In an open circuit test, copper losses are obtained while in short circuit test, core losses are obtained.

In an open circuit test, current is drawn at high power factor.

In a short circuit test, current is drawn at zero power factor

In an open circuit test, current is drawn at low power factor.

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