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For a power transistor, if the base current IB is increased keeping VCE constant, then a) IC increases b) IC decreases c) IC remains constant d) none of the mentioned
a Explanation: Ic is directly proportional to Ic.
a
See lessExplanation: Ic is directly proportional to Ic.
.In a power transistor, the IB vs VBE curve is a) a parabolic curve b) an exponentially decaying curve c) resembling the diode curve d) a straight line Y = IB
c Explanation: The B-E junction of a BJT resembles a p-n junction diode, hence the curve.
c
See lessExplanation: The B-E junction of a BJT resembles a p-n junction diode, hence the curve.
In a power transistor, _________ is the controlling parameter. a) VBE b) VCE c) IB d) IC
c Explanation: The base current controls the collector current. Hence, the base current Ib is the controlling parameter.
c
See lessExplanation: The base current controls the collector current. Hence, the base current Ib
is the controlling parameter.
.A power transistor is a _________ device. a) two terminal, bipolar, voltage controlled b) two terminal, unipolar, current controlled c) three terminal, unipolar, voltage controlled d) three terminal, bipolar, current controlled
d Explanation: Power transistor is simply many BJT’s connected in series parallel on a single silicon chip for power applications. It is a three terminal, bipolar, current controlled device
d
See lessExplanation: Power transistor is simply many BJT’s connected in series parallel on a
single silicon chip for power applications. It is a three terminal, bipolar, current controlled
device
In a power transistor, ____ is the controlled parameter. a) VBE b) VCE c) IB d) IC
b Explanation: It has three layers p-n-p or n-p-n forming two p-n junctions.
b
See lessExplanation: It has three layers p-n-p or n-p-n forming two p-n junctions.
.A power transistor is a a) three layer, three junction device b) three layer, two junction device c) two layer, one junction device d) four layer, three junction device
b Explanation: It has three layers p-n-p or n-p-n forming two p-n junctions
b
See lessExplanation: It has three layers p-n-p or n-p-n forming two p-n junctions
Which of the following devices does not belong to the transistor family? a) IGBT b) MOSFET c) GTO d) BJT
c Explanation: GTO is gate turn off transistor, it belongs to the Thyristor family. All the other devices belong to the transistor family
c
See lessExplanation: GTO is gate turn off transistor, it belongs to the Thyristor family. All the
other devices belong to the transistor family
Zener diodes allow a current to flow in the reverse direction, when the a) voltage reaches above a certain value b) temperature reaches above a certain value c) current always flows in the reverse direction only d) current cannot flow in the reverse direction
a Explanation: Zener diode has voltage regulating property. When voltage reaches above a certain value (Zener voltage), current starts to flow in the reverse direction
a
See lessExplanation: Zener diode has voltage regulating property. When voltage reaches above
a certain value (Zener voltage), current starts to flow in the reverse direction
Shown below is the diagram of an ideal super diode. When the input voltage Vin is positive, then the output voltage Vout = ? a) Vout/Vin b) Vin c) 0 d) Vin * Rl
b Explanation: Input is positive, hence it is amplified by the operational amplifier which switches the diode on. Current flows through the load & because of the feedback, the output voltage is equal to the input voltage.
b
See lessExplanation: Input is positive, hence it is amplified by the operational amplifier which
switches the diode on. Current flows through the load & because of the feedback, the
output voltage is equal to the input voltage.
.In a certain power electronics application, it is required that the voltage at the load terminals is to be kept within a certain range of voltages only. Among the device listed below, which would be the most ideal choice for this application? a) P-n junction diode b) Schottky diode c) Zener diode d) Fast recover diode
c Explanation: Zener diode is used as a voltage regulating device.
c
See lessExplanation: Zener diode is used as a voltage regulating device.