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Electronics and Instrumentation General Knowledge Quiz | Electronics and Instrumentation General Knowledge Objective Type Questions & Answers

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Free download in PDF Electronics and Instrumentation General Knowledge Objective Type Questions & 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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(21) Most commonly used indicator electrode is
[A] Glass electrode
[B] Silver – Silver chloride electrode
[C] Calomel electrode
[D] Silver electrode
Answer: Glass electrode
(22) Test electrode is also known as
[A] Indicator electrode
[B] Reference electrode
[C] Second electrode
[D] Primary electrode
Answer: Indicator electrode

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(23)

S1: In multimode fiber optics, intensity modulating schemes can be employed.

S2: Schemes using polarizing techniques need birefringent fiber.

[A] S1 is true and S2 is false
[B] Both S1 and S2 are true
[C] S1 is false and S2 is true
[D] Both S1 and S2 are false
Answer: Both S1 and S2 are true
(24) Photo conductive cell consists of a thin film of
[A] Selenium
[B] Barium titanate
[C] Quartz
[D] Lithium sulphate
Answer: Selenium
(25) In foil strain gauge the thickness of foil varies from
[A] 2.5 micron to 6 micron
[B] 2.5 micron to 5 micron
[C] 25 micron (or) less
[D] 25 micron to 60 micron
Answer: 2.5 micron to 6 micron
(26) The change in resistance of a metal wire owing to strain is due to

S1: Change in dimension of wire expressed by factor (1-2µ)

S2: Change in resistance ??

[A] S1 is true & S2 is false
[B] S2 is true & S1 is false
[C] Both S1 & S2 are true
[D] Both S1 & S2 are false
Answer: S2 is true & S1 is false
(27) Pressure transducer for measuring blood pressure is
[A] Strain gauge transducer only
[B] Strain gauge or capacitive transducer
[C] Resistive transducer
[D] Fiber optic transducer
Answer: Strain gauge or capacitive transducer
(28) Venturi is associated with
[A] Venous blood pressure
[B] Digital plethysmography
[C] Dialysate flow in artificial kidney
[D] Blood flow in heart lung machine
Answer: Blood flow in heart lung machine
(29) The application of LVDT is
[A] Joint motion
[B] Finger movement
[C] Limb movement
[D] Heart wall motion
Answer: Limb movement
(30) The principle of operation of variable resistance transducer is
[A] Deformation leads to change in resistance
[B] Displacement of a contact slider on a resistance
[C] Coupling of two coils changes with displacement
[D] Movement of magnetic field produces variation in resistance of material
Answer: Displacement of a contact slider on a resistance
31 The transducers which requires an external power and their output is a measure of some variation such as resistance, inductance, capacitance etc., are called as
[A] Active transducer
[B] Primary sensor
[C] Passive transducer
[D] Self generating transducer
Answer: Passive transducer
32 Pick the correct statement regarding functions of a transducer

S1: Sense the magnitude, change in & / or frequency of same measurand

S2: To provide electrical output that furnishes accurate, quantitative data about the measurand

[A] S1 is true & S2 is false
[B] S2 is true & S1 is false
[C] Both S1 & S2 are true
[D] Both S1 & S2 are false
Answer: Both S1 & S2 are true
33 Capacitive transducers are normally employed for___________ measurements
[A] Static
[B] Dynamic
[C] Transient
[D] Both static and dynamic
Answer: Dynamic
34 In a LVDT, the two secondary voltages
[A] Are independent of the core position
[B] Vary unequally depending on the core position
[C] Vary equally depending on the core position
[D] Are always in phase quadrature
Answer: Vary unequally depending on the core position
35 S1: Transducer is a device which converts physical into electrical quantity S2: Transducer is also called as sensor.
[A] S1 is true & S2 is false
[B] S2 is true & S1 is false
[C] Both S1 & S2 are true
[D] Both S1 & S2 are false
Answer: S2 is true & S1 is false
36 Which of the following can be measured with the help of piezo electric crystal?
[A] Force
[B] Velocity
[C] Sound
[D] Pressure
Answer: Force
37 LVDT is an/a ___________ transducer
[A] Eddy current
[B] Resistive
[C] Magneto-strict ion
[D] Inductive
Answer: Eddy current
38 _____________ is the example of photo emissive cell
[A] LDR
[B] Photo diode
[C] Photo transistor
[D] Photo multiplier
Answer: LDR
39 pH value of venous blood is
[A] 7.30
[B] 7.40
[C] 7.35
[D] 7.45
Answer: 7.35
40 Silver chloride electrode is used as a reference electrode due to its
[A] Large half cell potential
[B] Stable half cell potential
[C] Stable resting potential
[D] Stable action potential
Answer: Stable half cell potential

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