Electrical & Electronics Measurement & Instrumentation Test Questions - Set 1

1)   Instruments are subdivided into active and passive based on whether the output of instrument is produced by the quantity being measured simply changes the magnitude of some external power source. The pressure measuring device and the float - type petrol tank level indicator are example of

a. Active instruments
b. Passive instruments
c. Former is active instrument and later is passive instrument
d. Former is passive instrument and later is active instrument
Answer  Explanation 

ANSWER: Former is passive instrument and later is active instrument

Explanation:
No explanation is available for this question!


2)   Considering cost of instruments, which is better choice, active or passive?

a. Active instruments
b. Passive instruments
c. Cost of both active and passive instruments are approximately same
d. None of these
Answer  Explanation 

ANSWER: Passive instruments

Explanation:
No explanation is available for this question!


3)   In deadweight gauge, weights are added on the top of piston until the piston reaches a datum level. The datum level is known as

a. Null point, where the downward force balances the fluid pressure
b. Lowest point of the container
c. Highest level of fluid in the container
d. None of these
Answer  Explanation 

ANSWER: Null point, where the downward force balances the fluid pressure

Explanation:
No explanation is available for this question!


4)   The accuracy of the deflection type instruments and of the null type instruments depends on

a. Linearity, calibration of spring
b. Calibration of spring, linearity and calibration of weights
c. Linearity and calibration of spring, calibration of weights
d. Both depends on calibration of weight
Answer  Explanation 

ANSWER: Linearity and calibration of spring, calibration of weights

Explanation:
No explanation is available for this question!


5)   In terms of usage, deflection type instruments are

a. More convenient than null type instrument
b. Less convenient than null type instruments
c. Both are equally convenient
d. None of these
Answer  Explanation 

ANSWER: More convenient than null type instrument

Explanation:
No explanation is available for this question!


6)   The output of an analogue instrument varies

a. Continuously and can have an infinite number of values within its range of instruments
b. In discrete steps and can have an infinite number of values within its range of instruments
c. Continuously and can have an finite number of values within its range of instruments
d. In discrete steps and can have an infinite number of values within its range of instruments
Answer  Explanation 

ANSWER: Continuously and can have an infinite number of values within its range of instruments

Explanation:
No explanation is available for this question!


7)   The microcomputer performs its computations in

a. Analogue form
b. Digital form
c. Either analogue form or digital form depending on their applications
d. None of these
Answer  Explanation 

ANSWER: Digital form

Explanation:
No explanation is available for this question!


8)   To read and record a measurement, the indicating type instruments

a. Always requires human intervention
b. Does not requires human intervention
c. Requires human intervention only when the instrument consists of a rotating pointer moving against a scale
d. Requires human intervention only when the instrument consists of a rotating scale moving against a pointer
Answer  Explanation 

ANSWER: Always requires human intervention

Explanation:
No explanation is available for this question!


9)   The electromagnetic effect is generally utilized for

a. Ammeters
b. Voltmeters
c. Wattmeters and watt - hour meters
d. All of these
Answer  Explanation 

ANSWER: All of these

Explanation:
No explanation is available for this question!


10)   The electrostatic effect is utilized for

a. Ammeters
b. Voltmeters
c. D.C. ampere - hour meters
d. Wattmeters
Answer  Explanation 

ANSWER: Voltmeters

Explanation:
No explanation is available for this question!


11)   The instrument which can be used only with the D.C. supply is

a. PMMC instrument
b. Electrodynamometer instrument
c. Hot - wire instrument
d. Split phase induction type instrument
Answer  Explanation 

ANSWER: PMMC instrument

Explanation:
No explanation is available for this question!


12)   The instrument which can be used only with the A.C. supply is / are

a. Induction type
b. Electrostatic type
c. Electrodynamometer type
d. All of these
Answer  Explanation 

ANSWER: Induction type

Explanation:
No explanation is available for this question!


13)   In a hot wire ammeter the current flowing through the resistance of 10 Ω is given by (I = 3 + 2 sin 300 t A) The measured value of current will be

a. 2.98 A
b. 3.31 A
c. 3.62 A
d. 4.01 A
Answer  Explanation 

ANSWER: 3.31 A

Explanation:
No explanation is available for this question!


14)   In a hot wire instrument, readings are

a. Dependent on frequency
b. Dependent on waveform
c. Dependent on both frequency and waveform
d. Independent of both frequency and waveform
Answer  Explanation 

ANSWER: Independent of both frequency and waveform

Explanation:
No explanation is available for this question!


15)   To convert a 2 mA meter with internal resistance of 120 ohm into an ammeter of range 0 – 200 mA, the value of shunt resistance required is

a. 1.121 ohm
b. 1.212 ohm
c. 1.312 ohm
d. 1.414 ohm
Answer  Explanation 

ANSWER: 1.212 ohm

Explanation:
No explanation is available for this question!


16)   If a moving iron instrument is to be used as ammeter then the coil has

a. Fewer number of turns of thin wire
b. Fewer number of turns of thick wire
c. Larger number of turns of thin wire
d. Larger number of turns of thick wire
Answer  Explanation 

ANSWER: Fewer number of turns of thick wire

Explanation:
No explanation is available for this question!


17)   If the direction of current through the coil is upward, then the iron disc will be magnetized in such a way that it is

a. Pushed outwards
b. Pushed upwards
c. Pushed downwards
d. Pulled inwards
Answer  Explanation 

ANSWER: Pulled inwards

Explanation:
No explanation is available for this question!


18)   In the given options, the secondary fundamental unit is

a. Length
b. Luminous intensity
c. Plane angle
d. Time
Answer  Explanation 

ANSWER: Luminous intensity

Explanation:
No explanation is available for this question!


19)   Bridge circuits are used for the measurement of

a. Resistance
b. Inductance
c. Capacitance
d. All of these
Answer  Explanation 

ANSWER: All of these

Explanation:
No explanation is available for this question!


20)   Low resistance is the resistance of the order of

a. 1 ohm and less than 1 ohm
b. 1 ohm to 1 mega ohm
c. More than one ohm
d. None of these
Answer  Explanation 

ANSWER: 1 ohm and less than 1 ohm

Explanation:
No explanation is available for this question!