106. A transistor is basically an amplifying device for :
(a) Current
(b) Voltage
(c) Power
(d) None of the above
107. Which of the following could have a maximum width ?
(a) Base
(b) Emitter
(c) Collector
(d) None of these
108. Current gain in common base configuration is less than unity because –
(a) IC < IE
(b) IC > IE
(c) IB < IE
(d) IB > IE
109. The value of α –
(a) Is always less than 1
(b) Is always greater than 1
(c) May be less or greater than 1
(d) None of these
110. A transistor is essentially :
(a) Power driven device
(b) Current operated device
(c) Voltage operated device
(d) None of these
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Transistors » Exercise - 1 1. A transistor acts as a : (a) Diode and voltage source (b) Diode and current source (c) Diode and power supply (d) Diode and resistance 2. The free electrons recombine with a hole in the base region of a transistor to become : (a) Free electrons (b) Valence electrons (c) Atom (d) Majority carrier 3. Transistor is a : (a) current controlled current device (b) current controlled voltage device (c) voltage controlled current device (d) voltage controlled voltage device 4. ICBO in a transistor can be reduced by : (a) Reducing IB (b) Reducing VCC (c) Reducing IE (d) Reducing the temperature 5. The base current of a transistor is typically : (a) Less than emitter current (b) Greater than emitter current (c) Same as emitter current (d) Equal to the sum of emitter and collector currents 6. The current gain of a transistor is : (a) The ratio of collector current to emitter current (b) The ratio of collector current to base current (c) The ratio of base current to collector current (d) The ratio of emitter current to collector current 7. The most commonly used configuration of transistor as switch is : (a) CB (b) CC (c) CE (d) CB or CC 8. When an N-P-N transistor is used as an amplifier then : (a)…- Transistors » Exercise - 3 112. The correct relationship between emitter current (IE) base current (IB)and collector current (IC) for a transistor ? (a) IE – IC =IB (b) IC + IE =IB (c) IC – IB =IE (d) IE + IB =IC
- Transistors » Exercise - 1 20. For N-P-N transistor the value of β in common base is 100. The value of current gain α in common emitter is - (a) 0.99 (b) 0.92 (c) 1.01 (d) 0.95
- Transistors » Exercise - 3 117. For P-N-P transistor the value of α in common base is 0.98. the value of current gain β in common emitter is - (a) 4.9 (b) 49 (c) 0.49 (d) 0.98
- Transistors » Exercise - 1 28. Which is the largest transistor current ? (a) Emitter current (b) Base current (c) Collector current (d) Both Emitter & Collector currents