1
GATE EE 2001
MCQ (Single Correct Answer)
+2
-0.6
The electric field $$\overrightarrow E $$ (in volts/metre) at the point $$(1, 1, 0)$$ due to a point charge of $$+1$$ $$\mu C$$ located at $$\left( { - 1,\,1,\,1} \right)$$ (coordinates in metres) is
A
$${{{{10}^{ - 6}}} \over {20\sqrt 5 \pi {\varepsilon _0}}}\left( {2i - k} \right)$$
B
$${{{{10}^{ - 6}}} \over {20\pi {\varepsilon _0}}}\left( {2i - k} \right)$$
C
$${{ - {{10}^{ - 6}}} \over {20\sqrt 5 \pi {\varepsilon _0}}}\left( {2i - k} \right)$$
D
$${{ - {{10}^{ - 6}}} \over {20\pi {\varepsilon _0}}}\left( {2i - k} \right)$$
2
GATE EE 2001
MCQ (Single Correct Answer)
+2
-0.6
Given the potential function in free space to be $$V\left( x \right) = \left( {50{x^2} + 50{y^2} + 50{z^2}} \right)$$ volts, the magnitude (in volts /metre) and the direction of the electric field at a point $$\left( {1,\,\, - 1,\,\,1} \right),$$ where the dimensions are in metres, are
A
$$100\,\,\,\,;\left( {i + j + k} \right)$$
B
$$100/\sqrt 3 ;\,\,\left( {i - j + k} \right)$$
C
$$100\sqrt 3 ;\,\,\left[ {\left( { - i - j - k} \right) - \sqrt 3 } \right]$$
D
$$100\sqrt 3 ;\,\,\left[ {\left( { - i + j - k} \right) - \sqrt 3 } \right]$$
3
GATE EE 2001
MCQ (Single Correct Answer)
+2
-0.6
The conductors of a $$10$$ $$km$$ long, single phase, two wire line are separated by a distance of $$1.5$$ $$m.$$ The diameter of each conductor is $$1$$ $$cm.$$ If the conductors are of copper, the inductance of the circuit is
A
$$50.0$$ $$mH$$
B
$$45.3$$ $$mH$$
C
$$23.8$$ $$mH$$
D
$$19.6$$ $$mH$$
4
GATE EE 2001
Subjective
+5
-0
A voltage commutated thyristor chopper circuit is shown in fig. The chopper is operated at $$500$$ $$Hz$$ with $$50\% $$ duty ratio. The load takes a constant current of $$20A$$

(a) Evaluate the circuit turn off time for the main thyristor $$T{h_1}$$
(b) Calculate the value of inductor $$L,$$ if the peak current through the main thyristor $$Th,$$ is limited to $$180$$% of the load current.
(c)Calculate the maximum instantaneous output voltage of the chopper

GATE EE 2001 Power Electronics - Choppers and Commutation Techniques Question 17 English
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