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

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