Basic Electronics Engineering mcq | BXE mcq questions [SPPU]

Q. 1. A negative clipper removes the ___________ half-cycles of the input voltage.
A : Negative
B : Positive
C : Both positive and negative
D : No part of

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Negative

Q. 2. The common-mode voltage gain is
A : smaller than differential voltage gain
B : equal to voltage gain
C : greater than differential voltage gain
D : None of the above

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smaller than differential voltage gain

Q. 3. The _______ surrounds the _______ in a fiber-optic cable.
A : fiber,cladding
B : core, fiber
C : core; cladding
D : cladding; core

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cladding; core

Q. 4. What are the possible forms of energy transmission that can be
undertaken by a transducer ?
A : Acoustical
B : Electrical
C : Mechanical
D : All of the above

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All of the above

Q. 5. How many bits are required to store one BCD digit ?
A : 1
B : 2
C : 3
D : 4

4

Q. 6. The linear variable differential transformer transducer is
A : Inductive transducer
B : Non-inductive transducer
C : Capacitive transducer
D : Resistive transducer

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Inductive transducer

Q. 7. LED is a type of ________
A : Zener Diode
B : Varactor diode
C : P-N junction Diode
D : Gunn Diode

P-N junction Diode

Q. 8. Which circuit is used for obtaining desired output waveform in
operational amplifier?
A : Clipper
B : Clamper
C : Peak amplifier
D : Sample and hold

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Clipper

Q. 9. RTDs are typically connected with other fixed resistors.
A : in a pi configuration
B : in a bridge configuration
C : and variable resistors
D : and capacitors in a filter-type circuit

in a bridge configuration

Q. 10. The output of unfiltered half wave or fullwave rectifier is
A : smoth DC voltage
B : steady DC voltage
C : pulsating Dc voltage
D : AC voltage

pulsating Dc voltage

Q. 11. The core of an optical fiber is _______.
A : glass
B : plastic
C : metal
D : A or B

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A or B

Q. 12. In the common mode, ……………
A : both inputs are grounded
B : the outputs are connected together
C : an identical signal appears on both the inputs
D : the output signal are in-phase

an identical signal appears on both the inputs

Q. 13. Which among the following is having more wavelengths?
A : X-rays
B : Cosmic waves
C : Radio waves
D : Gamma rays

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Radio waves

Q. 14. Ripple factor for Half Wave Rectifier is
A : 1.21
B : 1.12
C : 1.32
D : 1.42

1.21

Q. 15. For silicon diode the barrier potential is approximately equals to
A : 0.3 V
B : 0.7 V
C : 6.8V
D : 2.0 V

0.7 V

Q. 16. Which of the following subsystem provides radio transmission between
mobile station and MSC?
A : BSS
B : NSS
C : OSS
D : BSC

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BSS

Q. 17. In a BJT
A : The base region is sandwiched between emitter and collector
B : The collector is sandwiched between base and emitter
C : The emitter region is sandwiched between base and collector
D : The drain region is sandwiched between emitter and collector

The base region is sandwiched between emitter and collector

Q. 18. Which of the following represents materials used for thickness
measurement using inductive transducer?
A : Material should be magnetic in nature
B : Material should be magnetic and conducting
C : Material should be magnetic and non-conducting
D : All of the mentioned

All of the mentioned

Q. 19. Choose the false statement.
A : SCR is a bidirectional device
B : SCR is a controlled device
C : In SCR the gate is the controlling terminal
D : SCR are used for high-power applications

SCR is a bidirectional device

Q. 20. _______ cable carries signals of higher frequency ranges than _______ cable.
A : Twisted-pair; coaxial
B : Twisted-pair; fiber-optic
C : Coaxial; twisted-pair
D : none of the above

Coaxial; twisted-pair

Q. 21. The op amp can amplify
A : AC signals only
B : DC signals only
C : Both ac and dc signals
D : Neither ac not dc signals

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Both ac and dc signals

Q. 22. PSSR is an op-amp parameter which defines the degree of dependence on
variations in _______.
A : temperature
B : pressure
C : power supply voltage
D : slew rate

power supply voltage

Q. 23. The forward break over voltage is maximum when
A : Gate current = ∞
B : Gate current = 0
C : Gate current = -∞
D : It is independent of gate current

Gate current = 0

Q. 24. The output of a particular Op-amp increases 8V in 12μs. The slew rate is
A : 90 V/μs
B : 0.67 V/μs
C : 1.5 V/μs
D : none of these

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0.67 V/μs

Q. 25. In decimal number system what is MSD
A : First digit from left to right
B : First digit from right to left
C : Middle digit
D : Mean of all digits

First digit from left to right

Q. 26. The output of a Schmitt trigger is a
A : triangle waveform.
B : pulse waveform.
C : sawtooth waveform.
D : sinusoidal waveform.

pulse waveform.

Q. 27. The arrow in the symbol of a transistor indicates the direction of
__________
A : electron current in the emitter
B : electron current in the collector
C : hole current in the emitter
D : donor ion current

hole current in the emitter

Q. 28. Most of the electrons in the base of an NPN transistor flow:
A : out of the base lead
B : into the collector
C : into the emitter
D : into the base supply

into the collector

Q. 29. What is PSRR value of an ideal op-amp?
A : Zero
B : Unity
C : Infinite
D : Unpredictable

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Zero

Q. 30. Output characteristics of common emitter configuration is plotted
between _____
A : IC and VCE at constant IE
B : IC and VCE at constant IB
C : IC and VCB at constant IB
D : IC and VCB at constant IE

IC and VCE at constant IB

Q. 31. Which of these sets of logic gates are designated as universal gates?
A : NOR, NAND.
B : XOR, NOR, NAND.
C : OR, NOT, AND.
D : NOR, NAND, XNOR.

NOR, NAND.

Q. 32. Function of transducer is to convert
A : Electrical signal into non electrical quantity
B : Non electrical quantity into electrical signal
C : Electrical signal into mechanical quantity
D : All of these

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Non electrical quantity into electrical signal

Q. 33. Which factor makes twisted-pair cable superior to fiber-optic cable?
A : signal attenuation
B : noise resistance
C : bandwidth range
D : cost

cost

Q. 34. Average load current (ILdc) for Half Wave Rectifier is _______
A : Im/π
B : 2Im/π
C : Im/2π
D : 2Im

Im/π

Q. 35. An SCR is a
A : four layer, four junction device
B : four layer, three junction device
C : four layer, two junction device
D : three layer, single junction device

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four layer, three junction device

Q. 36. A single and fundamental form of load cell which is basically used as a
transducer in the operation of a weighing machine undergoes the conversion of
___________.
A : Force into an electrical signal
B : Pressure into an electrical signal
C : Acceleration into an electrical signal
D : Velocity into an electrical signal

Force into an electrical signal

Q. 37. Which of the following conversion is correct for load cell?
A : Force to strain
B : Force to displacement
C : Force to voltage
D : Both force to strain and force to displacement

Both force to strain and force to displacement

Q. 38. 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

low resistance to high resistance

Q. 39. When a silicon diode is forward biased, what is VBE for a C-E
configuration?
A : voltage-divider bias
B : 0.4 V
C : 0.7 V
D : emitter voltage

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0.7 V

Q. 40. A pn junction allows current flow when
A : the n-type material is more positive than the p-type material
B : both the n-type and p-type materials have the same potential
C : the p-type material is more positive than the n-type material
D : there is no potential on the n-type or p-type materials

the p-type material is more positive than the n-type material

Q. 41. An inverting amplifier with gain 1 have different input voltage: 1.2v,3.2v
and 4.2v. Find the output voltage?
A : 4.2v
B : 8.6v
C : -4.2v
D : -8.6v

-8.6v

Q. 42. PIV in Half Wave Rectifier is given as ___________
A : Vm
B : 2Vm
C : 3Vm
D : Vm/π

Vm

Q. 43. A circuit whose output is proportional to the difference between the
input signals is considered to be which type of amplifier?
A : common-mode
B : darlington
C : differential
D : operational

differential

Q. 44. A differential amplifier has a common-mode gain of 0.2 and a commonmode rejection ratio of 3250. What would the output voltage be if the single-ended
input voltage was 7 mV rms?
A : 1.4 mV rms
B : 650 mV rms
C : 4.55 V rms
D : 0.455 V rms

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4.55 V rms

Q. 45. The binary equivalent of the decimal number 368 is
A : 1111E8
B : 1.1011E8
C : 1.1101E8
D : 1.111E8

1111E8

Q. 46. The TRIAC can be represented by
A : two SCRs in anti-parallel
B : two SCRs in parallel
C : two diodes in anti-parallel
D : two diodes in parallel

two SCRs in anti-parallel

Q. 47. A voltage V = 300 cos 100 t is applied to a half wave rectifier with load
resistance equal to 5 kΩ, the rectifier may be represented by an ideal diode in
series with a resistance of 1 kΩ, the value of Im I given as __
A : 500 mA
B : 50 mA
C : 56.56 mA
D : 52 mA

50 mA

Q. 48. With a differential gain of 50,000 and a common-mode gain of 2, what is
the common-mode rejection ratio?
A : –87.9 dB
B : –43.9 dB
C : 43.9 dB
D : 87.9 dB

87.9 dB

Q. 49. With full-wave rectification, current through the load resistor must be
A : in the same direction
B : from the reverse biased diode
C : to the external load
D : in opposite directions

in the same direction

Q. 50. Im = Vm/(Rs + 2Rf + RL) is given for ___________
A : Half Wave Rectifier
B : Full Wave Rectifier
C : Bridge Rectifier
D : Half Wave Rectifier with LC filter

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Full Wave Rectifier

Q. 51. The diode schematic arrow points to the
A : positive axial lead
B : trivalent-doped material
C : anode lead
D : cathode lead

cathode lead

Q. 52. In a transistor, the base current is about ________ of emitter current.
A : 0.25
B : 0.2
C : 0.35
D : 05

05

Q. 53. The static V-I curve for the SCR is plotted for
A : Ia (anode current) vs Ig (gate current), Va (anode – cathode voltage) as a parameter
B : Ia vs Va with Ig as a parameter
C : Va vs Ig with Ia as a parameter
D : Ig vs Vg with Ia as a parameter

Ia vs Va with Ig as a parameter

Q. 54. Which of the following memory device stores information such as
subscriber’s identification number in GSM?
A : Register
B : Flip flop
C : SIM
D : SMS

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SIM

Q. 55. The number of control lines for 32 to 1 multiplexer is
A : 4
B : 5
C : 16
D : 6

5

Q. 56. Zener breakdown voltage range can be controlled using _________
A : By controlling reverse voltage across PN junction
B : By controlling reverse current across PN junction
C : By controlling dopping level of P-N junction
D : By controlling reverse voltage as well as reverse current across PN junction

By controlling dopping level of P-N junction

Q. 57. Which of the following modulating signal voltage would cause overmodulation on a carrier voltage of 10v?
A : 9.5
B : 9.99
C : 10
D : 12

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12

Q. 58. A certain OP-amp has bias currents of 50 μA. The input offset current is
……..
A : 700 nA
B : 99.3 μA
C : 49.7 μA
D : none of these

700 nA

Q. 59. PIV in Bridge Rectifier is given as ____________
A : Vm
B : 2Vm
C : 3Vm
D : Vm/π

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2Vm

Q. 60. If the feedback/input resistor ratio of a feedback amplifier is 4.6 with 1.7
V applied to the noninverting input, what is the output voltage value?
A : 7.82 V
B : saturation
C : cutoff
D : 9.52 V

9.52 V

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