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
[showhide type=”button7c1″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: D [/showhide]
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
[showhide type=”button7c2″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
3   A transistor has …………………
    (A)   One pn junction
    (B)   Two pn junctions
    (C)   Three pn junctions
    (D)   Four pn junctions
[showhide type=”button7c3″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
4   The collector of a transistor is …………. doped
    (A)   Heavily
    (B)   Moderately
    (C)   Lightly
    (D)   None of the above
[showhide type=”button7c4″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
5   In a transistor ……………….
    (A)   IC = IE + IB
    (B)   IB = IC + IE
    (C)   IE = IC – IB
    (D)   IE = IC + IB
[showhide type=”button7c5″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: D [/showhide]
6   The value of α of a transistor is ……….
    (A)   More than 1
    (B)   Less than 1
    (C)   1
    (D)   None of the above
[showhide type=”button7c6″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
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
[showhide type=”button7c7″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
8   The most commonly used transistor arrangement is …………… arrangement
    (A)   Common emitter
    (B)   Common base
    (C)   Common collector
    (D)   None of the above
[showhide type=”button7c8″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
9   A BJT has three terminals, namely …………
    (A)   Cathode, Anode, Grid
    (B)   Emitter, Base, Collector
    (C)   Source, Gate, Drain
    (D)   None of the above
[showhide type=”button7c9″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
10   A JFET is a ………… driven device
    (A)   Current
    (B)   Voltage
    (C)   Both current and voltage
    (D)   None of the above
[showhide type=”button7c10″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
11   In a p-channel JFET, the charge carriers are ………….
    (A)   Electrons
    (B)   Holes
    (C)   Both electrons and holes
    (D)   None of the above
[showhide type=”button7c11″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
12   A MOSFET has …………… terminals
    (A)   Two
    (B)   Four
    (C)   Five
    (D)   Three
[showhide type=”button7c12″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
13   Which of the following devices has the highest input impedance?
    (A)   JFET
    (B)   MOSFET
    (C)   Crystal diode
    (D)   Ordinary transistor
[showhide type=”button7c13″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
14   The pinch-off voltage of a JFET is about ……….
    (A)   5 V
    (B)   0.6 V
    (C)   15 V
    (D)   25 V
[showhide type=”button7c14″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
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
[showhide type=”button7c15″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
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
[showhide type=”button7c16″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
17   The phase difference between the output and input voltages of a CE amplifier is ……………….
    (A)   0
    (B)   180
    (C)   90
    (D)   270
[showhide type=”button7c17″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
18   The input capacitor in an amplifier is the ………………. capacitor
    (A)   Bypass
    (B)   Coupling
    (C)   Leakage
    (D)   None of the above
[showhide type=”button7c18″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
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
[showhide type=”button7c19″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
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
[showhide type=”button7c20″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: D [/showhide]
21   The transconductance of FET depends upon
    (A)   Drain supply
    (B)   The type of FET
    (C)   Gate Current
    (D)   Gate to Source Voltage
[showhide type=”button7c21″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: D [/showhide]
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
[showhide type=”button7c22″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
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
[showhide type=”button7c23″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: D [/showhide]
24   A tuned amplifier uses ……………. load
    (A)   Resistive
    (B)   Capacitive
    (C)   Inductor
    (D)   LC tank
[showhide type=”button7c24″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: D [/showhide]
25   A tuned amplifier is used in …………… applications
    (A)   Radio frequency
    (B)   Low frequency
    (C)   Audio frequency
    (D)   None of the above
[showhide type=”button7c25″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
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
[showhide type=”button7c26″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
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
[showhide type=”button7c27″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
28   Negative feedback is employed in …………….
    (A)   Oscillators
    (B)   Rectifiers
    (C)   Amplifiers
    (D)   None of the above
[showhide type=”button7c28″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
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
[showhide type=”button7c29″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
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
[showhide type=”button7c30″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: D [/showhide]
31   Sweep rate of time base generator is controlled by a _________
    (A)   Capacitor
    (B)   Resistor
    (C)   Diode
    (D)   Inductor
[showhide type=”button8c1″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
32   Time base generator controls __________
    (A)   Intensity of light
    (B)   Current direction
    (C)   Voltage magnitude
    (D)   Spot movement
[showhide type=”button8c2″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: D [/showhide]
33   Time base generator Generates__________
    (A)   Saw tooth signal
    (B)   Co sinusoidal wave
    (C)   Sinusoidal wave
    (D)   Both a and b
[showhide type=”button8c3″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
34   Sweep generator is a sin wave generator.
    (A)   TRUE
    (B)   FALSE
[showhide type=”button8c4″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
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
[showhide type=”button8c5″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
36   Long form of BJT is
    (A)   Bipolar Junction Thyristor
    (B)   Bilinear Junction Thyristor
    (C)   Bipolar Junction Transistor
    (D)   Bilinear Junction Terminal
[showhide type=”button8c6″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
37   Long form of UJT is
    (A)   Unit Junction Thyristor
    (B)   Uniform Junction Terminal
    (C)   Uni Junction Transistor
    (D)   None of the above
[showhide type=”button8c7″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
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
[showhide type=”button8c8″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
39   Oscillator has which type of Feed Back
    (A)   Negative Feedback
    (B)   Positive Feedback
    (C)   Open loop system
    (D)   None of the above
[showhide type=”button8c9″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
40   Which of the following is the terminal of FET?
    (A)   Gate
    (B)   Drain
    (C)   Source
    (D)   All the above
[showhide type=”button8c10″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: D [/showhide]

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