1
GATE EE 2014 Set 1
MCQ (Single Correct Answer)
+2
-0.6
A 3 phase, 50 Hz, 6 pole induction motor has a rotor resistance of 0.1 Ω and reactance of 0.92 Ω. Neglect the voltage drop in stator and assume that the rotor resistance is constant. Given that the full load slip is 3%, the ratio of maximum torque to full load torque is
A
1.567
B
1.712
C
1.948
D
2.134
2
GATE EE 2014 Set 1
Numerical
+1
-0
A star connected 400 V, 50 Hz, 4 pole synchronous machine gave the following open circuit and short circuit test results:
Open circuit test: VOC = 400 V (rms, line–to–line) at field current, If = 2.3 A
Short circuit test: ISC = 10 A(rms, phase) at field current, If =1.5 A
The value of per phase synchronous impedance in Ω at rated voltage is __________.
Your input ____
3
GATE EE 2014 Set 1
MCQ (Single Correct Answer)
+2
-0.6
The following four vector fields are given in cartesian coordinate system. The vector field which does not satisfy the property of magnetic flux density is
A
$$y^2{\widehat a}_x\;+\;z^2{\widehat a}_y\;+\;x^2{\widehat a}_z$$
B
$$z^2{\widehat a}_x\;+\;x^2{\widehat a}_y\;+\;y^2{\widehat a}_z$$
C
$$x^2{\widehat a}_x\;+\;y^2{\widehat a}_y\;+\;z^2{\widehat a}_z$$
D
$$y^2z^2{\widehat a}_x\;+\;x^2z^2{\widehat a}_y\;+\;x^2y^2{\widehat a}_z$$
4
GATE EE 2014 Set 1
MCQ (Single Correct Answer)
+2
-0.6
Let $$S$$ be the set of points in the complex plane corresponding to the unit circle. $$\left( {i.e.,\,\,S = \left\{ {z:\left| z \right| = 1} \right\}} \right.$$ Consider the function $$f\left( z \right) = z{z^ * }$$ where $${z^ * }$$ denotes the complex conjugate of $$z.$$ The $$f(z)$$ maps $$S$$ to which one of the following in the complex plane?
A
unit circle
B
horizontal axis line segment from origin to $$(1, 0)$$
C
the point $$(1, 0)$$
D
the entire horizontal axis
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