Electric Circuits and Networks (ECN)
Multiple Choice Questions
1 Which of the following is not operating regions of a transistor?- (A) Active Region
- (B) Cut off Region
- (C) Saturation Region
- (D) Ohmic Region
2 When Transistor is working in Active Region, Status of Base Emitter and Collector Base junctions is
- (A) Reverse Bias, Forward Bias
- (B) Forward Bias, Reverse Bias
- (C) Forward Bias, Forward Bias
- (D) Reverse Bias, Reverse Bias
3 A transistor has …………………
- (A) One pn junction
- (B) Two pn junctions
- (C) Three pn junctions
- (D) Four pn junctions
4 The collector of a transistor is …………. doped
- (A) Heavily
- (B) Moderately
- (C) Lightly
- (D) None of the above
5 In a transistor ……………….
- (A) IC = IE + IB
- (B) IB = IC + IE
- (C) IE = IC – IB
- (D) IE = IC + IB
6 The value of α of a transistor is ……….
- (A) More than 1
- (B) Less than 1
- (C) 1
- (D) None of the above
7 In a transistor, IC = 100 mA and IE = 100.2 mA. The value of β is …………
- (A) 100
- (B) 500
- (C) About 1
- (D) None of the above
8 The most commonly used transistor arrangement is …………… arrangement
- (A) Common emitter
- (B) Common base
- (C) Common collector
- (D) None of the above
9 A BJT has three terminals, namely …………
- (A) Cathode, Anode, Grid
- (B) Emitter, Base, Collector
- (C) Source, Gate, Drain
- (D) None of the above
10 A JFET is a ………… driven device
- (A) Current
- (B) Voltage
- (C) Both current and voltage
- (D) None of the above
11 In a p-channel JFET, the charge carriers are ………….
- (A) Electrons
- (B) Holes
- (C) Both electrons and holes
- (D) None of the above
12 A MOSFET has …………… terminals
- (A) Two
- (B) Four
- (C) Five
- (D) Three
13 Which of the following devices has the highest input impedance?
- (A) JFET
- (B) MOSFET
- (C) Crystal diode
- (D) Ordinary transistor
14 The pinch-off voltage of a JFET is about ……….
- (A) 5 V
- (B) 0.6 V
- (C) 15 V
- (D) 25 V
15 The gate voltage in a JFET at which drain current becomes zero is called ………. voltage
- (A) Saturation
- (B) Pinch-off
- (C) Active
- (D) Cut-off
16 The configuration in which current gain of transistor amplifier is highest is
- (A) Common base
- (B) Common collector
- (C) Common emitter
- (D) None of the above
17 The phase difference between the output and input voltages of a CE amplifier is ……………….
- (A) 0
- (B) 180
- (C) 90
- (D) 270
18 The input capacitor in an amplifier is the ………………. capacitor
- (A) Bypass
- (B) Coupling
- (C) Leakage
- (D) None of the above
19 The point of intersection of d.c. and a.c. load lines is called …………….
- (A) Saturation point
- (B) Cut of Point
- (C) Operating Point
- (D) None of the above
20 The purpose of capacitors in a transistor amplifier is to ………………
- (A) Protect the transistor
- (B) Cool the transistor
- (C) Provide biasing
- (D) Couple or bypass ac component
21 The transconductance of FET depends upon
- (A) Drain supply
- (B) The type of FET
- (C) Gate Current
- (D) Gate to Source Voltage
22 The voltage gain of cascade amplifier using FET is
- (A) Almost Same as CS amplifier
- (B) Equal to C.D amplifier
- (C) Product of two voltage gains
- (D) None of the above
23 In FET the drain voltage above which there is no increase in the drain current is called…….. voltage
- (A) Critical
- (B) Pick off
- (C) Breakdown
- (D) Pinch off
24 A tuned amplifier uses ……………. load
- (A) Resistive
- (B) Capacitive
- (C) Inductor
- (D) LC tank
25 A tuned amplifier is used in …………… applications
- (A) Radio frequency
- (B) Low frequency
- (C) Audio frequency
- (D) None of the above
26 When negative voltage feedback is applied to an amplifier, its voltage gain ……………….
- (A) Is increased
- (B) Is reduced
- (C) Remains the same
- (D) None of the above
27 The gain of an amplifier with feedback is known as …………. gain
- (A) Resonant
- (B) Closed Loop
- (C) Open Loop
- (D) None of the above
28 Negative feedback is employed in …………….
- (A) Oscillators
- (B) Rectifiers
- (C) Amplifiers
- (D) None of the above
29 An oscillator converts …………….
- (A) AC power into DC power
- (B) AC power into AC power
- (C) Mechanical power into AC power
- (D) None of the above
30 In an LC oscillator, the frequency of oscillator is ……………. L or C.
- (A) Proportional to square of
- (B) Directly proportional to
- (C) Independent of the values of
- (D) Inversely proportional to square root of
31 Sweep rate of time base generator is controlled by a _________
- (A) Capacitor
- (B) Resistor
- (C) Diode
- (D) Inductor
32 Time base generator controls __________
- (A) Intensity of light
- (B) Current direction
- (C) Voltage magnitude
- (D) Spot movement
33 Time base generator Generates__________
- (A) Saw tooth signal
- (B) Co sinusoidal wave
- (C) Sinusoidal wave
- (D) Both a and b
34 Sweep generator is a sin wave generator.
- (A) TRUE
- (B) FALSE
35 Voltage regulators keep a constant ________ output voltage when the input or load varies within limits.
- (A) Ripple Voltage
- (B) AC Voltage
- (C) DC Voltage
- (D) None of the above
36 Long form of BJT is
- (A) Bipolar Junction Thyristor
- (B) Bilinear Junction Thyristor
- (C) Bipolar Junction Transistor
- (D) Bilinear Junction Terminal
37 Long form of UJT is
- (A) Unit Junction Thyristor
- (B) Uniform Junction Terminal
- (C) Uni Junction Transistor
- (D) None of the above
38 Long form of MOSFET
- (A) Metal oriented Short Functional Emitter Transistor
- (B) Metal Oxide Surface Facing Electronic Transmitter
- (C) Metal Oxide Semiconductor Field Effect Transistor
- (D) Metal Originated Surface Field Effect Thyristor
39 Oscillator has which type of Feed Back
- (A) Negative Feedback
- (B) Positive Feedback
- (C) Open loop system
- (D) None of the above
40 Which of the following is the terminal of FET?
- (A) Gate
- (B) Drain
- (C) Source
- (D) All the above