Basic Electronics (BEC)

22225

Multiple Choice Questions

1   Find out odd one
    (A)   Inductor
    (B)   Capacitor
    (C)   Transistor
    (D)   Resistor
[showhide type=”button7c1″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
2   Color code for 2.7k ohm resistance with 5 % tolerance is
    (A)   Orange violet Red Silver
    (B)   Red Violet Red Gold
    (C)   Orange Violet Orange Silver
    (D)   Red Violet Orange Gold
[showhide type=”button7c2″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
3   Color code for 3.6 microfarad capacitance is
    (A)   Orange Blue Green
    (B)   Orange Blue Blue
    (C)   Orange Violet Green
    (D)   Orange Violet Blue
[showhide type=”button7c3″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
4   Find Resistance value of resistor having color code as Blue Green Orange
    (A)   6.7k ohm
    (B)   6.7 M ohm
    (C)   6700 ohm
    (D)   670 ohm
[showhide type=”button7c4″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
5   Transistor and transformer are ________electronics components respectively
    (A)   Passive and active
    (B)   Active and active
    (C)   Passive and passive
    (D)   Active and passive
[showhide type=”button7c5″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: D [/showhide]
6   The current of an ideal current source is
    (A)   Zero
    (B)   Constant
    (C)   Load resistance dependent
    (D)   Internal resistance dependent
[showhide type=”button7c6″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
7   The unit of electrical Inductance is
    (A)   Farad
    (B)   Amp
    (C)   Ohm
    (D)   Henry
[showhide type=”button7c7″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: D [/showhide]
8   In electrical circuits, when capacitors are connected in parallel resultant capacitance will
    (A)   Decrease
    (B)   Remains constant
    (C)   Increase
    (D)   Can’t say
[showhide type=”button7c8″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
9   If the peak-to-peak voltage is 5V, 1 MHz, calculate the peak voltage and time period
    (A)   5V,1uS
    (B)   2.5V,1uS
    (C)   2.5V,0.5uS
    (D)   5V,0.5uS
[showhide type=”button7c9″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
10   DIP package of IC stands for
    (A)   Dual India package
    (B)   Dead Inline Package
    (C)   Dual Inline Package
    (D)   None of the above
[showhide type=”button7c10″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
11   In a semiconductor which of the following carriers can contribute to the current?
    (A)   Electrons
    (B)   Holes
    (C)   Both
    (D)   None
[showhide type=”button7c11″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
12   Which of the following semiconductor is pure?
    (A)   Intrinsic
    (B)   Extrinsic
    (C)   Compound
    (D)   Elemental
[showhide type=”button7c12″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
13   Identify the correct condition for a semiconductor to be electrically neutral.
    (A)   Nd+p=Na+n
    (B)   Nd-p=Na+n
    (C)   Nd+p=Na-n
    (D)   Nd-p=Na-n
[showhide type=”button7c13″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
14   The reverse current in a diode is of the order of ……………….
    (A)   kA
    (B)   mA
    (C)   μA
    (D)   A
[showhide type=”button7c14″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
15   The forward voltage drop across a Ge diode is about …………………
    (A)   0.7V
    (B)   0.5V
    (C)   0.3V
    (D)   1.5V
[showhide type=”button7c15″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
16   If the doping level in a crystal diode is increased, the width of depletion layer……….
    (A)   remains the same
    (B)   is decreased
    (C)   in increased
    (D)   none of the above
[showhide type=”button7c16″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
17   A Zener diode is used as ……………
    (A)   an amplifier
    (B)   a voltage attenuator
    (C)   a rectifier
    (D)   a voltage stabilizer
[showhide type=”button7c17″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: D [/showhide]
18   IC stands for
    (A)   Integrated Capacitors
    (B)   Indian Circuits
    (C)   Integrated Circuits
    (D)   Indian Codes
[showhide type=”button7c18″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
19   PN Junction diode can be configured in below ways
    (A)   1
    (B)   2
    (C)   3
    (D)   4
[showhide type=”button7c19″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
20   Sb atom is an impurity
    (A)   Trivalent
    (B)   Pentavalent
    (C)   Tetravalent
    (D)   Extrinsic
[showhide type=”button7c20″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
21   Potential Barrier at depletion layer is increases by
    (A)   Increasing Forward voltage
    (B)   Increasing Unbiased voltage
    (C)   Increasing Reverse voltage
    (D)   None of the above
[showhide type=”button7c21″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
22   In PN junction Diode Depletion layer width is
    (A)   Increases by increasing Forward voltage
    (B)   Increases by Increasing Unbiased voltage
    (C)   Decrease by increasing Reverse voltage
    (D)   None of the above
[showhide type=”button7c22″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: D [/showhide]
23   No of diodes used in Bridge rectifier
    (A)   1
    (B)   2
    (C)   3
    (D)   4
[showhide type=”button7c23″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: D [/showhide]
24   Rectifier converts
    (A)   DC to DC voltage
    (B)   DC to AC voltage
    (C)   AC to DC voltage
    (D)   None of the above
[showhide type=”button7c24″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
25   Doping process is used in
    (A)   Intrinsic semiconductor
    (B)   Extrinsic semiconductor
    (C)   Pure semiconductor
    (D)   None of the above
[showhide type=”button7c25″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
26   Which of the following is true for the active region of an NPN transistor?
    (A)   The collector current is directly proportional to the base current
    (B)   The potential difference between the emitter and the collector is less than 0.4 V
    (C)   All of the mentioned
    (D)   None of the mentioned
[showhide type=”button7c26″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
27   Which of the following is true for a pnp transistor in saturation region?
    (A)   CB junction is reversed bias and the EB junction is forward bias
    (B)   CB junction is forward bias and the EB junction is forward bias
    (C)   CB junction is forward bias and the EB junction is reverse bias
    (D)   CB junction is reversed bias and the EB junction is reverse bias
[showhide type=”button7c27″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
28   A transistor has how many doped regions?
    (A)   1
    (B)   2
    (C)   3
    (D)   4
[showhide type=”button7c28″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
29   If the base current is 1 mA and the current gain is 30, the collector current is
    (A)   30 mA
    (B)   3:00 am
    (C)   3.33 mA
    (D)   10mA
[showhide type=”button7c29″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
30   A transistor has …………………
    (A)   one PN junction
    (B)   two PN junctions
    (C)   three PN junctions
    (D)   four PN junctions
[showhide type=”button7c30″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
31   The base of a transistor is …………. doped
    (A)   heavily
    (B)   moderately
    (C)   lightly
    (D)   none of the above
[showhide type=”button8c1″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
32   The terminal part that has the largest size in a transistor is
    (A)   collector
    (B)   base
    (C)   emitter
    (D)   collector-base-junction
[showhide type=”button8c2″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
33   In a transistor, IC = 50 mA and IE = 51 mA. The value of β is
    (A)   100
    (B)   50
    (C)   about 1
    (D)   200
[showhide type=”button8c3″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
34   In a transistor, signal is transferred from a …………… circuit
    (A)   high resistance to low resistance
    (B)   low resistance to high resistance
    (C)   high resistance to high resistance
    (D)   low resistance to low resistance
[showhide type=”button8c4″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
35   If the value of α is 0.98, then value of β is ……….
    (A)   98
    (B)   0.98
    (C)   49
    (D)   0.49
[showhide type=”button8c5″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
36   MOSFET has three terminals, namely …………
    (A)   cathode, anode, grid
    (B)   emitter, base, collector
    (C)   source, gate, drain
    (D)   none of the above
[showhide type=”button8c6″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
37   MOSFET will more acts as a
    (A)   Resistor
    (B)   Inductor
    (C)   Capacitor
    (D)   Triode
[showhide type=”button8c7″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
38   A JFET is a ………… controlled device
    (A)   current
    (B)   voltage
    (C)   both current and voltage
    (D)   none of the above
[showhide type=”button8c8″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
39   The input impedance of a JFET is …………. that of an ordinary transistor
    (A)   equal to
    (B)   less than
    (C)   Just more than
    (D)   Very High
[showhide type=”button8c9″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: D [/showhide]
40   If the reverse bias on the gate of a JFET is increased, then width of the conducting channel …………
    (A)   is decreased
    (B)   is increased
    (C)   remains the same
    (D)   none of the above
[showhide type=”button8c10″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
41   D MOSFET can be operated with …………….
    (A)   negative gate voltage only
    (B)   positive gate voltage only
    (C)   positive as well as negative gate voltage
    (D)   none of the above
[showhide type=”button8c11″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
42   The major advantages of a JFET are ………….
    (A)   high input impedance and square-law property
    (B)   inexpensive and high output impedance
    (C)   low input impedance and high output impedance
    (D)   none of the above
[showhide type=”button8c12″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
43   For a given MOSFET, find the value of constant k if Vt=1 V, Vgs =3V, Id=3 mA
    (A)   0.75
    (B)   0.5
    (C)   7.5
    (D)   5
[showhide type=”button8c13″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
44   The total operating range of the transducer is called __________
    (A)   span
    (B)   threshold
    (C)   offset
    (D)   drift
[showhide type=”button8c14″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
45   Electrical transducers generate ________
    (A)   biological signals
    (B)   chemical signals
    (C)   physical signals
    (D)   electrical signals
[showhide type=”button8c15″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: D [/showhide]
46   Strain gauge measurement involves __________
    (A)   Wheatstone bridge
    (B)   Kelvin bridge
    (C)   De Sauty’s bridge
    (D)   Anderson bridge
[showhide type=”button8c16″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
47   Photovoltaic transduction involves ___________
    (A)   voltage generation heat
    (B)   voltage generation through sound
    (C)   voltage generation through light
    (D)   voltage generation current
[showhide type=”button8c17″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
48   A quartz crystal is an example of _________
    (A)   a chemical transducer
    (B)   a photoelectric transducer
    (C)   a photovoltaic transducer
    (D)   A piezoelectric transducer
[showhide type=”button8c18″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: D [/showhide]
49   Thermocouple is based on principal of
    (A)   Eddy current effect
    (B)   Seeback effect
    (C)   Gauge’s effect
    (D)   Gauss’s effect
[showhide type=”button8c19″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
50   LVDT is used for measurement of
    (A)   displacement
    (B)   velocity
    (C)   voltage
    (D)   power
[showhide type=”button8c20″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]

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