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Electronics Engineering Objective Questions { Power Semiconductor Devices and Their Applications }

232. The major application of chopper drive is in
A. traction
B. computers
C. heating furnances
D. miniature motors
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233. When transistors are used in series or parallel a snubber circuit is used to
A. control the current
B. control the voltage
C. limit di/dt
D. all of the above
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234. Which of the following VHF/UHF applications?
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235. Which of the following thyristors are gate turned off device?I. Gate turned off thyristorII. Static induction thyristor III MOS-controlled thyristor
A. I only
B. II only
C. I and II only
D. 1,11 and III
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236. An ideal rectifier should have transformer utilisation factor (TUF) of 1. If the actual TUF is 3.5, it shows that
A. diode is underloaded
B. the transformer must be 3.5 times larger
C. the transformer should be only 1/3.5 times the ideal size
D. the ripple factor is low
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237. An ideal rectifier should have 1. Harmonic factor = 1 2. Transformer utilisation Factor = 1 3. Efficiency = 100% 4. Effective value of ac component of output voltage = 0
A. SITs and BJTs
C. Power transformers transistor
D. Infrared light-emitting diode and a silicon phototransistor
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238. 'Thermal run away' of thyristor occurs
A. when the load is suddenly withdrawn
B. if the temperature of thyristor is high
C. in case forward anode-to-cathode voltage is greater than the forward break down voltage
D. in case gate current is high
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