Скачать или смотреть Multiple Choice Questions | Chapter 17 | Electronics l 2nd Year Physics | Federal Board & KPK Board

Each of the following questions is followed by four answers. Select the correct answer in each case.
In an N-type silicon, which of the following statement is true
A. Electrons are majority carriers and trivalent atoms are the dopants.
B. Electrons are minority carriers and pentavalent atoms are the dopants.
C. Holes are minority carriers and pentavalent atoms are the dopants.
D. Holes are majority carriers and trivalent atoms are the dopants.
The barrier potential of silicon diode at room temperature is
A. 0.3V B. 0.7V C. 0.9V D. 1.0V
The width of depletion region of a junction
A. Increase under forward bias B. Is dependent of applied voltage
C. Increases under reverse bias D. Remains same
For common emitter configuration of NPN transistor, current gain is given by
A. I_C/I_B B. I_C/I_E C. I_E/I_B D. I_B/I_E
The reverse saturation current in a PN junction diode is only due to
A. majority carriers B. minority carriers C. acceptor ions D. donor ions
PN junction when reversed biased act as:
A. Capacitor B. ON switch C. Inductor D. OFF switch
Improper biasing of a transistor circuit produces
A. Heavy loading of emitter current B. Distortion in the output signal
C. Excessive heat at collector terminal D. Faulty location of load line
When transistors are used in digital circuits they usually operate in the:
A. Active region B. Breakdown region C. Linear region D. Saturation & cutoff regions
Most of the electrons in the base of an NPN transistor flow:
A. out of the base lead B. into the collector C. into the emitter D. into the base supply
In a transistor, collector current is controlled by:
A. collector voltage B. base current C. collector resistance D. all of the above
The minimum number of diode required for full wave rectification are
A. 3 B. 4 C. 2 D. 1
In a transistor both collector-base and base-emitter junctions are reversed biased then it is
A. Active region B. Cutoff region C. Saturation region D. Q-point