Electrical and Electronics Measurements and Instrumentation Online Test 1 – Randomized MCQs

With each visit of this Electrical and Electronics Measurements and Instrumentation online Quiz / Practice Test, the list of MCQs / Objective Questions presented will be different, offering you a diverse set of practice opportunities. This variability encourages you to practice extensively, refining the accuracy of your answers and your overall grasp of the content. By utilizing this resource, you can hone your skills and become more adept at managing time constraints during actual exams.

Test Instructions
Question type	Randomized MCQs.Changes every time you visit the test
Total Number of Questions	30
Time Limit	20 Minutes
Points	1 Point for each Question

Remaining Time: 0 MINUTES

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Question 1 of 30

Q-1.The function of notch filter is

pass high frequency signal

pass a particular band of signal

pass low frequency signal

none of these

Your Answer:Correct

Your Answer:Incorrect

Question 2 of 30

Q-2.The reason for using ring type specimens for ballistic tests is :

They are free from end effects

They require less labour to prepare as compared with bar type specimens

They can be used for large quantities of materials of very small permeability

All the above.

Your Answer:Correct

Your Answer:Incorrect

Question 3 of 30

Q-3.Clamp-on type and split-core type CTs are used because

their accuracy is high

it is possible to insert the CT in the circuit without breaking the main line

they are cheaper

all of the above

Your Answer:Correct

Your Answer:Incorrect

Question 4 of 30

Q-4.There are two modes in which synchro transmitter-transmitter pair are used i.e (i) error detection mode (ii) torque transmission mode. The torque in the torque transmission mode

Is greater than that in the error transmission mode

Is smaller than that in the error transmission modes

The torque is same in both the modes

None of the above.

Your Answer:Correct

Your Answer:Incorrect

Question 5 of 30

Q-5.In a carrier system, drift and spurious signals are important,

Because they modulate the carrier

Because they do not modulate the carrier

Because it is easy to achieve a stable carrier than a stabilized d.c source.

None of the above.

Your Answer:Correct

Your Answer:Incorrect

Question 6 of 30

Q-6.A PMMC meter rated at 50 µA is used in a rectifier type of instrument which uses full wave rectification. What is the sensitivity on sinusoidal a.c ?

20 kΩ/V

9 kΩ/V

22.2 kΩ/V

18 kΩ/V

Your Answer:Correct

Your Answer:Incorrect

Question 7 of 30

Q-7.The advantages of instrument transformers are

The readings of instruments used along with instrument transformers rarely depend on the impedance of the instrument

Due to availability of standardized instrument transformers and associated instruments, there is reduction in cost and ease of replacement

The metering circuit is electrically isolated from the power circuit

all of the above

Your Answer:Correct

Your Answer:Incorrect

Question 8 of 30

Q-8.An amplifier has an input signal voltage of 25 µV and a noise voltage 2.5 µV. The signal to noise ratio is

100

10db

none of the above

Your Answer:Correct

Your Answer:Incorrect

Question 9 of 30

Q-9.A galvanometer has a ratio of 0.9 for damped frequency oscillations to undamped frequency of oscillations. Suppose moment of inertia, stiffness constant and damping constant is made twice their original value that would be the new ratio of damped frequency oscillations to undamped frequency oscillations.

0.9

1.11

Your Answer:Correct

Your Answer:Incorrect

Question 10 of 30

Q-10.A moving iron instrument can be used for current and voltage measurements

In a.c circuits only

In d.c circuits only

In both a.c and d.c circuits for any value of frequency (in case of a.c circuits)

In both a.c and d.c circuits for frequencies up to about 125 Hz (in case of a.c circuits).

Your Answer:Correct

Your Answer:Incorrect

Question 11 of 30

Q-11.A modifying input to a measurement system can be defined as an input

which changes the input–output relationship for desired as well as interfering inputs

which changes the input–output relationship for desired inputs only

which changes the input–output relationship for interfering inputs only

none of the above

Your Answer:Correct

Your Answer:Incorrect

Question 12 of 30

Q-12.When a magnetic material is subjected to alternating field, loss of power occurs owing to

hysteresis only

eddy current only

both hysteresis and eddy currents

none of the above

Your Answer:Correct

Your Answer:Incorrect

Question 13 of 30

Q-13.Identify the correct statement.

Carrier frequencies of FM signals are relatively lower than AM signals

Antennas for FM signals are larger in size than AM antennas.

FM signals can travel longer distance than AM signals

FM signals are more immune to noise than AM signals

Your Answer:Correct

Your Answer:Incorrect

Question 14 of 30

Q-14.The heater wire of thermocouple instrument is made very thin in order

to have a high value of resistance

to reduce skin effects at high frequencies

to reduce the weight of the instrument

to decrease the over-ranging capacity of the instrument

Your Answer:Correct

Your Answer:Incorrect

Question 15 of 30

Q-15.Magneto-elastic transducers work on the principle of

Change of dimensions with change of applied stress

Change of permeability with change in stress

Change of co-ercive force with change of stress

None of the above.

Your Answer:Correct

Your Answer:Incorrect

Question 16 of 30

Q-16.Capacitive transducers have the advantages of

very high input impedance

very high input impedance, excellent frequency response, high sensitivity and not being affected by stay magnetic fields

both (a) and (b)

none of the above

Your Answer:Correct

Your Answer:Incorrect

Question 17 of 30

Q-17.The power in a 3 phase four wire circuit can be measured by using

2 wattmeters

4 wattmeters

3 wattmeters

1 wattmeters

Your Answer:Correct

Your Answer:Incorrect

Question 18 of 30

Q-18.When measuring cable insulation using a dc source, the galvanometer used is initially short circuited to

discharge the stored charge in the cable

bypass the high initial charging current

prevent the galvanometer from getting damaged due to low resistance of the cable

all of the above

Your Answer:Correct

Your Answer:Incorrect

Question 19 of 30

Q-19.LEDs operating in the wavelength of 800–900 nm are mainly made of

GaAs

GaAlAs

GaAsP

InGaAsP

Your Answer:Correct

Your Answer:Incorrect

Question 20 of 30

Q-20.Creeping in the single phase induction type energy meter may be due to :

Overcompensation for friction

Overvoltage

Vibrations

All the above.

Your Answer:Correct

Your Answer:Incorrect

Question 21 of 30

Q-21.The gauge factor is defined as______________Where L, D,ρ and R are respectively the length, diameter, resistivity and resistance of strain gauge

(∆L/L)/(∆R/R)

(∆R/R)/(∆L/L)

(∆R/R)/(∆D/D)

(∆R/R)/(∆ρ/ρ)

Your Answer:Correct

Your Answer:Incorrect

Question 22 of 30

Q-22.The scale of a 0-500V voltmeter is divided into ten large divisions representing 50 V each and each large division is further subdivided into 10 small divisions, each representing 5 V. it is used for measurement of output voltage of a potentiometer which can be varied from 0 to 500 v. it is observed that when the sliding contact is moved from its zero position, , there is no perceptible movement of pointer of the voltmeter till the sliding contact reaches a position where the output voltage should be 5 V. Therefore, it can be concluded that

The threshold of the voltmeter is 5 V

the resolution of the voltmeter is 5 V

the sensitivity of the voltmeter is 5 V

None of the above.

Your Answer:Correct

Your Answer:Incorrect

Question 23 of 30

Q-23.Which of the following measures the magnetic flux density?

Ballistic galvanometer

Grassot fluxmeter

Permeameter

All of the above

Your Answer:Correct

Your Answer:Incorrect

Question 24 of 30

Q-24.In a measurement system if a q₁ is an across variable and its associated through variable is q₂(Power based), the static impedance of the system is :

q₁×q₂

q_{1 /} q₂

q_{2 /}q₁

q₁^{2 /}q₂

Your Answer:Correct

Your Answer:Incorrect

Question 25 of 30

Q-25.Phantom loading for testing of energy meters is used :

To isolate the current and potential circuits

To reduce power loss during testing

For meters having low current ratings

To test meters having a large current rating for which loads may not be available in the laboratory. This also reduces power losses during testing.

Your Answer:Correct

Your Answer:Incorrect

Question 26 of 30

Q-26.The output from a transducer has a frequency of 50 Hz. It modulates (amplitude modulation) a carrier having a frequency of 1 kHz. The output wave shape contains frequencies which are:

1000 Hz, 1050 Hz

1000 Hz, 950 Hz.

950 Hz and 1050 Hz.

2000 Hz ± 100 Hz

Your Answer:Correct

Your Answer:Incorrect

Question 27 of 30

Q-27.A Nixie tube requires

150 V – 220 V

100 V – 150 V

150 mV – 220 mV

100 mV – 150 mV

Your Answer:Correct

Your Answer:Incorrect

Question 28 of 30

Q-28.The gas used in plasma screens is a mixture of

nitrogen and oxygen

nitrogen and xenon

argon and nitrogen

argon and xenon

Your Answer:Correct

Your Answer:Incorrect

Question 29 of 30

Q-29.The capacitive transducers have a high output impedance and therefore

To reduce loading effects long length of cables can be used

To increase the value of resonant frequency long length of cables should be used

Long cable lengths should be used in conjunction with capacitive transducers in order to improve their frequency response

None of the above.

Your Answer:Correct

Your Answer:Incorrect

Question 30 of 30

Q-30.An astable multivibrator

Gives one output pulse for every two input pulses

Gives a timed output pulse for a trigger input

Gives a train of output pulses for a trigger input

Gives four output pulses for a single input pulse.

Your Answer:Correct

Your Answer:Incorrect

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Electrical and Electronics Measurements and Instrumentation Online Test 1 – Randomized MCQs

Electrical and Electronics Measurements and Instrumentation Online Test 1 – Randomized MCQs

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