Electrical and electronics measuring instruments MCQ's (Multiple choise questions)

              

1. A shering bridge can be used for the?

A) protecting the circuit from temprature rise
B) testing capacitance
C) measuring voltage
D) measuring current

ANSWER= (B) meassuring capacitance
Explaination:- schering bridge is used for the measurement of small capacitance.
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2. A multiplier is _____

A) non capacitive
B) capacitive
C) non inductive
D) resistive

ANSWER= (C) non iductive
Explaination:- a multiplier is non inductive having high resistance that is used for extend the range of dc voltmeter.
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3. The type of damping used for moving iron instrument is?

A) air friction damping
B) fluid friction damping
C) eddy current damping
D) gravity friction damping

ANSWER= (A) air friction damping
Explaination:- Air friction damping is used in moving iron instruments.
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4. When the pointer of an indicating instrument is in motion then the deflecting torque is opposed by?

A) damping torque
B) controlling torque
C) Both damping torque and controlling toprque
D) none of the above

ANSWER= (B) controlling torque
Explaination:- controlling torque oppose the deflecting torqueand it increase with the deflection of the instruments.
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5. A galvanometer is used to?

A) detect the direction of light
B) messure the power
C) detect the direction of current
D) detect the voltage level

ANSWER= (C) detect the dirction of current
Explaination:- galvanometer is used to detect and messure small amount of current.galvanomete is invented by Johann Schweigger in 1820.
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6. Which of the follwing are intigrating instrument?

A) Ammeter
B) voltmeters
C) wattmeters
D) energy meter

ANSWER= (A) Energy meter
Explaination:- Eneregy meter is a intigrating instrument because it record the monthly data.
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7. ____ instruments are those which measure the total quantity of electricity delivered in a particular time.

A) Absolute instruments
B) Indicating instruments
C) Recording instruments
D) intigrating instruments

ANSWER= (D) intigrating instrument
Explaination:- intigrating instrument are those which measure the total quantity of electricity delivered in a particular time.
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8. A potentiometer may be used for?

A)mesurement of resistance
B) calibration of ammeter
C) calibration of voltmeter
D) All of the above

ANSWER= (A) All of the above Explaination:- potentiometer may be used for measuring of resistance current and calibration of voltmeter and ammeter.
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9. An ammeter is a ___

A) secondary instrument
B) absolute instrument
C) recording instrument
D) intigrating instrument

ANSWER= (A) Secondary instrument
Explaination:- ammmeter and voltmeter comes under secondary instruments.
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10. Which of the following instrument is free from hysterisis and eddy current errors?

A) moving iron instrument
B) electrostatic instrument
C) PMMC instrument
D) all of the above

ANSWER= (B) electrostatic instrument
Explaination:- electrostatic instruments are free from hysterisis and eddy current errors.
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11.random error accure in messurement system due to ?

A) enviroment differences
B) poor calibrating practice
C) human mistake
D) unpredictable effacts

ANSWER= (D) unpredictable effacts
Explaination:- Random error accure in messurement system due to unpredictable effacts.
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12.The most efficient damping considred in messurment system is ?

A) air friction
B) fluid friction
C) eddy currents
D) none of the above

ANSWER= (C ) eddy currents
Explaination:- eddy current damping: when a conductor moves in a magnetic field an emf is induced in it in a closed path that is known as eddy current. this currrent intract with the magnetic field to produce an electrmagnetic torque which oppose the motoion.
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13.which instrument is used for dc messurement only ?

A) moving coil
B) moving iron
C) attraction type moving
D) none of the above

ANSWER= (A) moving coil
Explaination:- permenant magnet moving coil instrument (PMMC) is only used for dc messurement only. moving iron type instrument can be used for both AC and DC measurement. rectifire type instrument are used for AC measurements only. induction type instrument are used for AC measurement only. thermocoupal type instrument can be used for both AC and DC.
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14.Dissipation factor of a capacitor can be measured with ?

A) Galvanometer
B) Campbell bridge
C) potentiometer
D) schering bridge

ANSWER= (D) schering bridge
Explaination:- Dissipation factor of a capacitor can be measured with schering bridge. Galvanometer is used to detact the flow of current. Campbell bridge is used to messure mutual inductance.
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15.The principle of Galvanometer is based on ?

A) heating effact of current
B) magnetic effact of current
C) electrostatic effact
D) none of the above

ANSWER= (B) magnetic effact of current
Explaination:-Moving coil galvanometer is based on the effact that when a current carrying coil is placed in a magnetic field it experience a torque.
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16.The electron lens of C.R.O consist of ?

A) grid and cathode
B) shield and grid
C) focussing electrode
D) none

ANSWER= (C) focussing electrode
Explaination:- The electron lens of C.R.O consist of focussing electrode.
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17.A moving iron instrument are used for ?

A) AC only
B) DC only
C) Both
D) none

ANSWER= (A) both AC and DC.
Explaination:- A moving iron instrument can be used for Both AC and DC.
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18.A maxwell bridge is used for measurement of ?

A) inductance only
B) resistance only
C) frequancy
D) capacitance

ANSWER= (A) inductance only
Explaination:- A maxwell bridge is used for measurement of inductance only.
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19.For measurement of radio frequancy Ac signals___ type meter is used.

A) thermocouple
B) electrostatic
C) moving iron type
D) none

ANSWER= (A) Thermo-couple type instrument
Explaination:- thermo-couple type instruments can be used for the measurement of ac signal up to 50 Mhz.
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20.The operating voltage of the megger is about ?

A) 6v
B) 12v
C) 30v
D) 100v

ANSWER= (D) 100v
Explaination:- The operating voltage of the megger is about 50 to 100v.
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