1
GATE EE 1995
MCQ (Single Correct Answer)
+1
-0.3
An inverter capable of supplying a balanced three - phase variable voltage variable frequency output is feeding a three - phase induction motor rated for $$50$$ $$Hz$$ and $$440V.$$ The stator winding resistances of the motor are negligible small. During starting, the current inrush can be avoided without sacrificing the starting torque by suitably applying.
A
Low voltage at rated frequency
B
Low voltage keeping the $$V/f$$ ratio constant
C
Rated voltage at low frequency
D
Rated voltage at rated frequency
2
GATE EE 1995
Numerical
+1
-0
A single phase Inverter with square wave output voltage will have in its output waveform a fifth harmonic component equal to ______ percentage of the fundamental
Your input ____
3
GATE EE 1995
Subjective
+5
-0
Match the following GATE EE 1995 Power Electronics - Inverters Question 6 English 1 GATE EE 1995 Power Electronics - Inverters Question 6 English 2 GATE EE 1995 Power Electronics - Inverters Question 6 English 3

$$(P)$$ single phase fully controlled $$ac-dc$$ converter
$$(Q)$$ Voltage commutated $$dc-ac$$ chopper ($$E$$ = input $$dc$$ voltage)
$$(R)$$ Phase voltage of a star connected balanced three-phase load fed from a three-phase inverter with $${180^ \circ }$$ conduction (input $$dc$$ voltage=$$E$$)
$$(S)$$ Line voltage of a six stepped inverter with input dc voltage $$E$$
$$(T)$$ Three-phase diode bridge rectifier.

4
GATE EE 1995
MCQ (Single Correct Answer)
+1
-0.3
The insulation level of a $$400$$ kV, EHV overhead transmission line is decided on the basis of
A
lightning over voltage
B
switching over voltage
C
corona inception voltage
D
radio and TV interference
EXAM MAP