1
GATE EE 2018
MCQ (Single Correct Answer)
+1
-0.3
A single-phase 100 kVA, 1000 V / 100 V, 50 Hz transformer has a voltage drop of 5%
across its series impedance at full load. Of this, 3% is due to resistance. The percentage
regulation of the transformer at full load with 0.8 lagging power factor is
2
GATE EE 2018
MCQ (Single Correct Answer)
+2
-0.6
A transformer with toroidal core of permeability $$\mu $$ is shown in the figure. Assuming
uniform flux density across the circular core cross-section of radius r $$ \ll $$ R, and neglecting
any leakage flux, the best estimate for the mean radius R is
![GATE EE 2018 Electrical Machines - Transformers Question 6 English](https://imagex.cdn.examgoal.net/8Ox1yHRWvzZx9AMPJ/xKHl26ayvbRrxpFY2R4BwirTQUY3D/PoeSq6ADXLg6wDqc8wWu69/uploadfile.jpg)
![GATE EE 2018 Electrical Machines - Transformers Question 6 English](https://imagex.cdn.examgoal.net/8Ox1yHRWvzZx9AMPJ/xKHl26ayvbRrxpFY2R4BwirTQUY3D/PoeSq6ADXLg6wDqc8wWu69/uploadfile.jpg)
3
GATE EE 2018
Numerical
+1
-0
A separately excited dc motor has an armature resistance R$$a$$ = 0.05Ω. The field excitation
is kept constant. At an armature voltage of 100 V, the motor produces a torque of 500 Nm
at zero speed. Neglecting all mechanical losses, the no-load speed of the motor (in radian/s)
for an armature voltage of 150 V is _____ (up to 2 decimal places).
Your input ____
4
GATE EE 2018
Numerical
+2
-0
A 200 V DC series motor, when operating from rated voltage while driving a certain load,
draws 10 A current and runs at 1000 r.p.m. The total series resistance is 1 Ω. The magnetic
circuit is assumed to be linear. At the same supply voltage, the load torque is increased by
44%. The speed of the motor in r.p.m. (rounded to the nearest integer) is ________
Your input ____
Paper analysis
Total Questions
Electrical and Electronics Measurement
2
Electrical Machines
7
Electromagnetic Fields
2
Power Electronics
6
Power System Analysis
8
General Aptitude
10
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