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Which of the following relations is true for a BJT?
Answer: a Explanation: The collector & emitter current differ only by the base current, which is very very small
Answer: a
See lessExplanation: The collector & emitter current differ only by the base current, which is very
very small
A 1mv of i/p gives an output of 1V, the voltage gain as such would be
Answer: c Explanation: 1V/1mv = 1000.
Answer: c
See lessExplanation: 1V/1mv = 1000.
. For a power transistor, the average power loss during the delay time can be given by the equation
Answer: b Explanation: During the delay time only, the collector current flows & base to emitter voltage is zero. Hence the average power can be found, simply by integrating it over the total delay time & dividing by the base time period
Answer: b
See lessExplanation: During the delay time only, the collector current flows & base to emitter
voltage is zero. Hence the average power can be found, simply by integrating it over the
total delay time & dividing by the base time period
The instantaneous power loss during the delay time of a transistor is given by
Answer: a Explanation: During the delay time only the collector current flows & base to emitter voltage is zero.
Answer: a
See lessExplanation: During the delay time only the collector current flows & base to emitter
voltage is zero.
High frequency operation of any device is limited by the
Answer: b Explanation: Lower the switching losses higher the frequency of operation of the device.
Answer: b
See lessExplanation: Lower the switching losses higher the frequency of operation of the device.
.For a power transistor, which of the following relations is true?
Answer: a Explanation: Practically speaking Ie = Ib+Ic. Ie is the highest as it is the sum of the collector and base currents. The base current is the smallest.
Answer: a
See lessExplanation: Practically speaking Ie = Ib+Ic. Ie is the highest as it is the sum of the
collector and base currents. The base current is the smallest.
The power electronics devices have a very high efficiency because
Answer: b Explanation: They are efficient due to their higher transition speeds.
Answer: b
See lessExplanation: They are efficient due to their higher transition speeds.
.A power BJT is used as a power control switch by biasing it in the cut off region (off state) or in the saturation region (on state). In the on state
Answer: a Explanation: When base-emitter & base-collector junctions are forward biased only than both the p-n junctions are forward biased and the device is on.
Answer: a
See lessExplanation: When base-emitter & base-collector junctions are forward biased only than
both the p-n junctions are forward biased and the device is on.
The value of β is given by the expression
Answer: a Explanation: Collector current by the base current is beta, its value is in the range 50 to 300.
Answer: a
See lessExplanation: Collector current by the base current is beta, its value is in the range 50 to
300.
The forward current gain α is given by
Answer: b Explanation: Collector current by emitter current is the current gain, its value is close to one but never greater than.
Answer: b
See lessExplanation: Collector current by emitter current is the current gain, its value is close to
one but never greater than.