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1

### GATE EE 1994

MCQ (Single Correct Answer)
A switched mode power supply operating at $$20$$ $$kHz$$ to $$100$$ $$kHz$$ range uses as the main switching element
A
Thysistor
B
$$MOSFET$$
C
Triac
D
$$UJT$$
2

### GATE EE 1994

Fill in the Blanks
A triac can be triggered by a gate pulse of __________ polarity

## Answer

either positive or negative
3

### GATE EE 1993

MCQ (Single Correct Answer)
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
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