1
GATE EE 1994
MCQ (Single Correct Answer)
+1
-0.3
The directional derivative of $$f\left( {x,y} \right) = 2{x^2} + 3{y^2} + {z^2}\,\,$$ at point $$P\left( {2,1,3} \right)\,\,$$ in the direction of the vector $$\,\,a = \overrightarrow i - 2\overrightarrow k \,\,$$ is
A
$$4/\sqrt 5 $$
B
$$-$$ $$4/\sqrt 5 $$
C
$$\sqrt 5 /4$$
D
$$-$$ $$\sqrt 5 /4$$
2
GATE EE 1994
MCQ (Single Correct Answer)
+1
-0.3
A switched mode power supply operating at $$20$$ $$kHz$$ to $$100$$ $$kHz$$ range uses as the main switching element
A
Thysistor
B
$$MOSFET$$
C
Triac
D
$$UJT$$
3
GATE EE 1994
Fill in the Blanks
+1
-0
A triac can be triggered by a gate pulse of __________ polarity
4
GATE EE 1994
True or False
+1
-0
The output voltage of a six - pulse double star rectifier is the same as that of a three - phase half wave rectifier
A
TRUE
B
FALSE
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