Electrical Machines
Induction Machines
Marks 1Marks 2
Synchronous Machines
Marks 1Marks 2Marks 5
1
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
2
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
3
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
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
$$65$$ $$V$$
GATE EE Subjects
Electromagnetic Fields
Signals and Systems
Engineering Mathematics
General Aptitude
Power Electronics
Power System Analysis
Analog Electronics
Control Systems
Digital Electronics
Electrical Machines
Electric Circuits
Electrical and Electronics Measurement