1
GATE EE 2014 Set 3
Numerical
+1
-0
The no-load speed of a 230 V separately excited dc motor is 1400 rpm. The armature resistance drop and the brush drop are neglected. The field current is kept constant at rated value. The torque of the motor in Nm for an armature current of 8 A is ____________.
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2
GATE EE 2014 Set 3
Numerical
+2
-0
A separately excited 300 V DC shunt motor under no load runs at 900 rpm drawing an armature current of 2 A. The armature resistance is 0.5 $$\Omega$$ and leakage inductance is 0.01 H. When loaded, the armature current is 15 A. Then the speed in rpm is _____
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3
GATE EE 2014 Set 3
MCQ (Single Correct Answer)
+2
-0.6
The mean thickness and variance of silicon steel laminations are 0.2 mm and 0.02 respectively. The varnish insulation is applied on both the sides of the laminations. The mean thickness of one side insulation and its variance are 0.1 mm and 0.01 respectively. If the transformer core is made using 100 such varnish coated laminations, the mean thickness and variance of the core respectively are
A
30 mm and 0.22
B
30 mm and 2.44
C
40 mm and 2.44
D
40 mm and 0.24
4
GATE EE 2014 Set 3
MCQ (Single Correct Answer)
+2
-0.6
The parameters measured for a 220V/110V, 50 Hz, single-phase transformer are:

Self inductance of primary winding = 45 mH
Self inductance of secondary winding = 30 mH
Mutual inductance between primary and secondary windings = 20 mH

Using the above parameters, the leakage (Ll1 , Ll2) and magnetizing (Lm) inductances as referred to primary side in the equivalent circuit respectively, are
A
5mH, 20mH and 40mH
B
5mH, 80mH and 40mH
C
25mH, 10mH and 20mH
D
45mH, 30mH and 20mH
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