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Power Electronics
Power Electronics Interview
Quiz 1
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Q.1
For a certain SCR configuration, the below shown waveform is obtained. Find the value of the average output voltage with α =& Vs =V.
a) 50.27 V
b) 100.8 V
c) 140 V
d) 120 V
Q.2
A single-phase half wave circuit has Vs =V with a R load ofΩ. Find the average load current at α = 30°.
a) 1.45 A
b) 0.57 A
c) 0.96 A
d) 2.3 A
Q.3
A single phaseV, 1 kW heater is connected across a 1-phaseV,Hz supply through an SCR. The firing angle of the SCR is adjusted to give a rms voltage ofV. Find the power absorbed by the heater element.
a) 250 watts
b) 1 kW
c) 454 watts
d) 378 watts
Q.4
For a single phase half-wave thyristor circuit with R load, the power delivered to the resistive load is
a) (average load voltage) x (average load current)
b) (rms supply voltage)2/R
c) (rms load voltage)2/R
d) (average load voltage)/R
Q.5
For a single phase half-wave thyristor circuit with R load, the input power factor is given by
a) rms source voltage/total rms line current
b) rms input power/power delivered to the load
c) cos α
d) power delivered to load/input VA
Q.6
For the below shown circuit,
a) gradually rising
b) going from positive to negative
c) gradually decaying
d) zero
Q.7
For the below shown circuit,
a) load voltage & load current are both zero
b) only load voltage is zero
c) only load current is zero
d) both are non zero & non negative
Q.8
In case of a single-phase half-wave circuit with RL load, with firing angle α and extinction angle β, the conduction angle γ can be written as
a) γ = β+α
b) γ = β-α
c) γ = β/α
d) γ = α/β
Q.9
For a half-wave single phase thyristor rectifier circuit with any type of load the _______ + _________ waves must ideally give the supply voltage waveform.
a) load voltage, load current
b) load voltage, thyristor voltage
c) supply current, load voltage
d) supply current, thyristor voltage
Q.10
In case of a single-phase half-wave circuit with RL load, with firing angle α and extinction angle β, the thyristor is reversed biased from
a) β to α
b) β to 2π+α
c) β to 2π
d) β to 2β
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