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

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Questions
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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