GATE EE 2008 | Choppers and Commutation Techniques Question 31 | Power Electronics

GATE EE 2008

MCQ (Single Correct Answer)

-0.6

In the circuit shown in the figure, the switch is operated at a duty cycle of $$0.5.$$ A large capacitor current is connected across the load. The inductor current is assumed to be continuous. GATE EE 2008 Power Electronics - Choppers and Commutation Techniques Question 15 English

GATE EE 2008 Power Electronics - Choppers and Commutation Techniques Question 15 English

The average voltage across the load and the average current through the diode will respectively be

$$10$$ $$V,$$ $$2A$$

$$10$$ $$V,$$ $$8A$$

$$40$$ $$V,$$ $$2A$$

$$40$$ $$V,$$ $$8A$$

GATE EE 2007

MCQ (Single Correct Answer)

-0.6

The circuit in the figure is current commutated $$dc$$ $$-$$ $$dc$$ chopper where, $$T{h_M}$$ is the main $$SCR$$ and $$T{h_AUX}$$ is the auxiliary $$SCR$$. The load current is constant at $$10$$ $$A.$$
$$T{h_M}$$ is $$ON$$
$$T{h_AUX}$$ is trigged at $$t=0.$$ $$T{h_M}$$ is turned $$OFF$$ between. GATE EE 2007 Power Electronics - Choppers and Commutation Techniques Question 16 English

GATE EE 2007 Power Electronics - Choppers and Commutation Techniques Question 16 English

$$0{\mkern 1mu} {\mkern 1mu} \mu s < t \le 25{\mkern 1mu} {\mkern 1mu} \mu s$$

$$25{\mkern 1mu} {\mkern 1mu} \mu s < t \le 50{\mkern 1mu} {\mkern 1mu} \mu s$$

$$50{\mkern 1mu} {\mkern 1mu} \mu s < t \le 75{\mkern 1mu} {\mkern 1mu} \mu s$$

$$75{\mkern 1mu} {\mkern 1mu} \mu s < t \le 100{\mkern 1mu} {\mkern 1mu} \mu s$$

GATE EE 2006

MCQ (Single Correct Answer)

-0.6

A voltage commutated chopper operating at $$1$$ $$kHz$$ is used to control the speed of $$dc$$ motor as shown in figure. The load current is assumed to be constant at $$10$$ $$A.$$ GATE EE 2006 Power Electronics - Choppers and Commutation Techniques Question 18 English

GATE EE 2006 Power Electronics - Choppers and Commutation Techniques Question 18 English

The minimum time in $$\mu $$ sec for which the $$SCR$$ $$M$$ should be ON is

$$280$$

$$140$$

$$70$$

$$0$$

GATE EE 2006

MCQ (Single Correct Answer)

-0.6

A voltage commutation circuit is shown in figure. If the turn off time of the $$SCR$$$$s$$ is $$50$$ $$\mu \sec $$ and as safety margin of $$2$$ is considered, what will be the approximate minimum value of capacitor required for proper commutation? GATE EE 2006 Power Electronics - Choppers and Commutation Techniques Question 13 English