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Electronics and Instrumentation Quiz | Electronics and Instrumentation Multiple Choice Questions(MCQs) & Answers

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Free download in PDF Electronics and Instrumentation Multiple Choice Questions(MCQs) & Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries.
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(1) The size of air cored transducers in comparison to the iron core parts is
[A] Smaller
[B] Larger
[C] Same
[D] Unpredictable
Answer: Larger
(2) LVDT windings are wound on
[A] Steel sheets
[B] Aluminium
[C] Ferrite
[D] Copper
Answer: Ferrite

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(3) The draw backs of strain gauges are

S1: Low fatigue life

S2: They are expensive, brittle and sensitive to temperature

S3: Poor linearity

[A] S1 and S2
[B] S2 and S3
[C] S1 and S3
[D] S1 only
Answer: S2 and S3
(4) Piezo electric crystal can produce an emf
[A] When external mechanical force is applied to i
[B] When radiant energy stimulates the crystal
[C] When external magnetic field is applied
[D] When the junction of two such crystals are heated
Answer: When external mechanical force is applied to i
(5) Piezo – electric transducers work when we apply _____________ to it.
[A] Mechanical force
[B] Vibrations
[C] Illuminations
[D] Heat
Answer: Heat
(6) Piezo-electric transducers are
[A] Passive transducers
[B] Inverse transducers
[C] Digital transducers
[D] Pulse transducers
Answer: Inverse transducers
(7) Quartz and Rochelle salt belongs to ___________ of piezo-electric materials
[A] Natural group
[B] Synthetic group
[C] Natural or Synthetic group
[D] Fiber group
Answer: Natural group
(8) Certain type of materials generates an electrostatic charge or voltage when mechanical force is applied across them. Such materials are called
[A] Piezo-electric
[B] Photo-electric
[C] Thermo-electric
[D] Photo-resistive
Answer: Piezo-electric
(9) Bonded wire strain gauges are
[A] Used for both stress analysis and construction of transducer
[B] Pressure measurement
[C] Exclusively used for construction of transducers
[D] Exclusively used for stress analysis
Answer: Used for both stress analysis and construction of transducer
(10) In wire wound strain gauges, the change in resistance is due to
[A] Change in diameter of the wire
[B] Change in length of the wire
[C] Change in both length and diameter
[D] Change in resistivity
Answer: Change in both length and diameter
(11) The sensitivity factor of strain gauge is normally of the order of
[A] 1 to 1.5
[B] 1.5 to 2.0
[C] 0.5 to 1.0
[D] 5 to 10
Answer: 1.5 to 2.0
(12) Resolution of a transducer depends on
[A] Material of wire
[B] Length of wire
[C] Diameter of wire
[D] Excitation voltage
Answer: Diameter of wire
(13) A strain gauge is a passive transducer and is employed for converting
[A] Mechanical displacement into a change of resistance
[B] Pressure into a change of resistance
[C] Force into a displacement
[D] Pressure into displacement
Answer: Mechanical displacement into a change of resistance
(14) An inverse transducer is a device which converts
[A] An electrical quantity into a non electrical quantity
[B] Electrical quantity into mechanical quantity
[C] Electrical energy into thermal energy
[D] Electrical energy into light energy
Answer: An electrical quantity into a non electrical quantity
(15) Strain gauge, LVDT and thermocouple are examples of
[A] Active transducers
[B] Passive transducers
[C] Analog transducers
[D] Primary transducers
Answer: Analog transducers
(16) Which of the following is a digital transducer?
[A] Strain gauge
[B] Encoder
[C] Thermistor
[D] LVDT
Answer: Encoder
(17) A transducer that converts measurand into the form of pulse is called
[A] Active transducer
[B] Analog transducer
[C] Digital transducer
[D] Pulse transducer
Answer: Pulse transducer
(18) The transducers that converts the input signal into the output signal, which is a discrete function of time is known as ___________ transducer.
[A] Active
[B] Analog
[C] Digital
[D] Pulse
Answer: Digital
(19) Self generating type transducers are ___________ transducers.
[A] Active
[B] Passive
[C] Secondary
[D] Inverse
Answer: Active
(20) The principle of operation of LVDT is based on the variation of
[A] Mutual inductance
[B] Permanence
[C] Self inductance
[D] Reluctance
Answer: Mutual inductance

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