GATE EE 2005 | GATE EE Year Wise Previous Years Questions

GATE EE 2005

MCQ (Single Correct Answer)

-0.6

Consider a phase $$-$$ controlled converter shown in figure The thyristor is fired at an angle $$\alpha $$ in every positive half cycle of the input voltage. If the peak value of the instantaneous output voltage equals $$230$$ $$V,$$ the firing angle $$\alpha $$ is close to GATE EE 2005 Power Electronics - Single and Three Phase Rectifier Question 37 English

GATE EE 2005 Power Electronics - Single and Three Phase Rectifier Question 37 English

$${45^ \circ }$$

$${135^ \circ }$$

$${90^ \circ }$$

$${83.6^ \circ }$$

GATE EE 2005

MCQ (Single Correct Answer)

-0.3

A three - phase diode bridge rectifier is fed from a $$400$$ $$V$$ $$RMS$$. $$50$$ $$Hz$$, three $$-$$ phase $$AC$$ source. If the load is purely resistive, then peak instantaneous output voltage is equal to

$$400\,V$$

$$400\,\,\sqrt 2 V$$

$$400\,\,\sqrt {{2 \over 3}\,} \,V$$

$${{400} \over {\sqrt 3 \,V}}$$

GATE EE 2005

MCQ (Single Correct Answer)

-0.6

An electronic switch $$S$$ is required to block voltages of either polarity during its OFF state as shown in figure (a). This switch is required to conduct in only one direction during its ON state as shown in the figure (b). GATE EE 2005 Power Electronics - Power Semiconductor Devices Question 11 English 1

GATE EE 2005 Power Electronics - Power Semiconductor Devices Question 11 English 1

Which of the following are valid realizations of the switch $$s$$?

GATE EE 2005 Power Electronics - Power Semiconductor Devices Question 11 English 2

Only $$1$$

$$1$$ and $$2$$

$$1$$ and $$3$$

$$3$$ and $$4$$

GATE EE 2005

MCQ (Single Correct Answer)

-0.6

The figure shows the voltage across a power semiconductor device and the current through the device during a switching transition. Is the transition a turn ON transition or a turn OFF transition? What is the energy lost during the transition? GATE EE 2005 Power Electronics - Power Semiconductor Devices Question 12 English

GATE EE 2005 Power Electronics - Power Semiconductor Devices Question 12 English

Turn ON, $${{V{\rm I}} \over {2\left( {{t_1} + {t_2}} \right)}}$$

Turn OFF, $$V{\rm I}\left( {{t_1} + {t_2}} \right)$$

Turn ON, $$V{\rm I}\left( {{t_1} + {t_2}} \right)$$

Turn OFF, $${{V{\rm I}} \over {2\left( {{t_1} + {t_2}} \right)}}$$

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