1
GATE EE 1998
MCQ (Single Correct Answer)
+1
-0.3
The laws of electromagnetic induction (Faraday's and Lenz's law) are summarized in the following equation:
A
e = iR
B
$$\mathrm e\;=\;\mathrm L\frac{\operatorname d\mathrm i}{\operatorname d\mathrm t}$$
C
$$\mathrm e\;=\;-\frac{\operatorname d\mathrm\psi}{\operatorname d\mathrm t}$$
D
none of these
2
GATE EE 1998
MCQ (Single Correct Answer)
+1
-0.3
The efficiency of a 100 kVA transform is 0.98 at full as well as at half load. For this transformer at full load the copper loss.
A
is less than core loss
B
is equal to core loss
C
is more than core loss
D
none of the above
3
GATE EE 1998
MCQ (Single Correct Answer)
+1
-0.3
The magnetizing current in a transformer is rich in
A
3rd harmonic
B
5th harmonic
C
7th harmonic
D
13th harmonic
4
GATE EE 1997
MCQ (Single Correct Answer)
+1
-0.3
The low voltage winding of a $$400/230V,$$ $$1$$-phase, $$50$$ $$Hz$$ transformer is to be connected to a $$25$$ $$Hz,$$ the supply voltage should be
A
$$230$$ $$V$$
B
$$460$$ $$V$$
C
$$115$$ $$V$$
D
$$65$$ $$V$$
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