1
GATE EE 1998
MCQ (Single Correct Answer)
+2
-0.6
A 240 V d.c. shunt motor with an armature resistance of 0.5 $$\Omega$$ has a full load current of 40 A. Find the ratio of the stalling torque to the full load torque when a resistance of 1 $$\Omega$$ is connected in series with the armature?
A
4
B
12
C
6
D
None of the above
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
$$e = L{{di} \over {dt}}$$
C
$$e = - {{d\psi } \over {dt}}$$
D
none of these
3
GATE EE 1998
Subjective
+5
-0
An electron moves in the $$X$$-$$Y$$ plane with a speed of $${10^6}\,\,m/s.$$ Its velocity vector makes an angle of $${60^ \circ }$$ with $$X$$ axis. A magnetic field of magnitude $${10^{ - 2}}T$$ exists along the $$Y$$ axis. Compute the magnetic force exerted on the electron and its direction.
4
GATE EE 1998
Subjective
+5
-0
An infinite number of charges, each equal to $$'q'$$ are placed along the $$x=1,x=2, x=4, x=8, x=16$$ and so on, Find the potential and electric field at point $$x=0,$$ due to these system of charges.
EXAM MAP