1
GATE EE 1993
Fill in the Blanks
+1
-0
Given the differential equation $${y^1} = x - y$$ with initial condition $$y(0)=0.$$ The value of $$y(0.1)$$ calculated numerically upto the third place of decimal by the $${2^{nd}}$$ order Runge-Kutta method with step size $$h=0.1$$ is
2
GATE EE 1993
MCQ (Single Correct Answer)
+1
-0.3
The thermal resistance between the body of a power semiconductor device and the ambient is expressed as
A
Voltage across the device divided by current through the device
B
Average power dissipated in the device divided by the square of the $$RMS$$ current in the device
C
Average power dissipted in the device divided by the temperature difference from body to ambient
D
Temperature difference from body to ambient divided by average power dissipated in the divice
3
GATE EE 1993
MCQ (Single Correct Answer)
+1
-0.3
A chopper operating at a fixed frequency is feeding an $$R$$-$$L$$ load. As the duty ratio of the chopper is increased from $$25\% $$ to $$75\% $$, the ripple in the load current
A
Remains constant
B
Decreases, reaches a minimum at $$50\% $$ duty ratio and then increases
C
Increases, reaches a maximum at $$50\% $$ duty ratio and then decreases
D
Keeps on increasing as the duty ratio is increased
4
GATE EE 1993
MCQ (Single Correct Answer)
+1
-0.3
When a line commutated converter operates in the inverter mode
A
It draws both real and reactive power from the A.C supply
B
It delivers both real and reactive power to the $$A.C$$ supply
C
It delivers real power to the A.C supply
D
It draws reactive power from the $$A.C$$ supply
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