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 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 2 of 30

Q-2.In a Q meter, the value of shunt resistance connected across the oscillator is typically of the order of :

mΩ

µΩ

kΩ

Your Answer:Correct

Your Answer:Incorrect

Question 3 of 30

Q-3.The power can be controlled in a circuit by :

controlling the voltage applied to load

controlling the current level in the circuit

using pulse modulation of power

All of the above.

Your Answer:Correct

Your Answer:Incorrect

Question 4 of 30

Q-4.The Lissajous pattern on a CRO screen is shown in the given figure: The frequency ratio of the vertical signal to the horizontal one is

3 : 2

2 : 3

5 : 1

1 : 5

Your Answer:Correct

Your Answer:Incorrect

Question 5 of 30

Q-5.In a Blumlein bridge using two capacitive transducers in push pull configuration, the bridge sensitivity factor above the resonance frequency for a tightly coupled bridge is ,

2 and is independent of the variations of the bridge frequency and ratio arm inductance

2 and is dependent of the variations of the bridge frequency and ratio arm inductance

Practically constant and is lower than that of bridge with uncoupled arms

Variable and is dependent upon the frequency even though the ratio arms are tightly coupled.

Your Answer:Correct

Your Answer:Incorrect

Question 6 of 30

Q-6.In single-phase induction-type energy meters, lag adjustments are done by

permanent magnet placed on the edge of the disc

holes provided on the side limbs of the pressure coil

copper shading bands placed on the central limb of the pressure coil

metal shunts placed on the series magnets

Your Answer:Correct

Your Answer:Incorrect

Question 7 of 30

Q-7.Ratio error in a CT can be reduced by

using good quality, low loss steel for core

placing primary and secondary windings closer to each other

using thick conductors for secondary winding

all of the above

Your Answer:Correct

Your Answer:Incorrect

Question 8 of 30

Q-8.In spring-controlled moving iron instruments, the scale is

uniform

cramped at the lower end and expanded at the upper end

expanded at the lower end and cramped at the upper end

cramped both at the lower and the upper ends

Your Answer:Correct

Your Answer:Incorrect

Question 9 of 30

Q-9.When a relay is NOT energised

there is an electrical path through the NO contacts

there is an electrical path through the NC contacts

neither the NO or the NC contacts have an electrical path

both the NO and the NC contacts have an electrical path

Your Answer:Correct

Your Answer:Incorrect

Question 10 of 30

Q-10.LEDs operating in the wavelength of 800–900 nm are mainly made of

GaAs

GaAlAs

GaAsP

InGaAsP

Your Answer:Correct

Your Answer:Incorrect

Question 11 of 30

Q-11.A differential amplifier having CMRR 50,000 has a difference mode gain of 500. The common mode gain is :

0.1

0.01

0.001

Your Answer:Correct

Your Answer:Incorrect

Question 12 of 30

Q-12.Braking torque provided by the permanent magnet in an induction-type energy meter is proportional to

speed of the rotating disc

square of the flux of the permanent magnet

distance of the permanent magnet with respect to centre of the disc

all of the above

Your Answer:Correct

Your Answer:Incorrect

Question 13 of 30

Q-13.The closed loop gain of an OPAMP is dependent upon whether the OPAMP is used,

In inverting mode

In non-inverting mode

Is independent of the fact whether the input is connected to inverting or the non-inverting terminal

Is dependent upon the fact that whether the input is connected to inverting or the non-inverting terminal.

Your Answer:Correct

Your Answer:Incorrect

Question 14 of 30

Q-14.The response time of CRT display is

higher that LCD display

lower than LCD display

higher than plasma display

lower than plasma display

Your Answer:Correct

Your Answer:Incorrect

Question 15 of 30

Q-15.Swamping resistance is connected

in series with the shunt to reduce temperature error in shunted ammeter

in series with the ammeters to reduce errors on account of friction

in series with meter and have a high resistance temperature coefficient in order to reduce temperature errors in ammeters.

in series with the meter and have a negligible resistance co-efficient in order to reduce temperature errors in shunted ammeters

Your Answer:Correct

Your Answer:Incorrect

Question 16 of 30

Q-16.The units of luminous intensity are

Lux

W/sr

Cd/sr.

Your Answer:Correct

Your Answer:Incorrect

Question 17 of 30

Q-17.Ayrton shunt is used in d’Arsonval galvanometers so as to limit the current in the galvanometer coil to its maximum permissible value. The relative value of current through the galvanometer coil and the shunt

Depends upon the value of resistance of galvanometer coil only

Depends upon the resistance of galvanometer coil and the shunt

Does not depends upon the value of resistance of galvanometer coil

None of the above.

Your Answer:Correct

Your Answer:Incorrect

Question 18 of 30

Q-18.The disadvantages of using multipliers with voltmeters at high voltages are :

The power consumption of multipliers becomes large at large voltages

The multipliers at high voltages have to be shielded in order to prevent capacitive currents

The metering circuit is not electrically from the power circuit

All the above.

Your Answer:Correct

Your Answer:Incorrect

Question 19 of 30

Q-19.A 741 OPAMP has a open loop gain 200,000. The input offset voltage is 2 mV. If the input terminals are shorted , the output voltage is :

0 V

∞

400 V

±400 V.

Your Answer:Correct

Your Answer:Incorrect

Question 20 of 30

Q-20.The lower limit of useful working range of a transducer is determined by

transducer error and noise

minimum useful input level

dynamic response

cross-sensitivity

Your Answer:Correct

Your Answer:Incorrect

Question 21 of 30

Q-21.Modem is an acronym of

Modulation

Demodulation

Modulation and demodulation

All the above.

Your Answer:Correct

Your Answer:Incorrect

Question 22 of 30

Q-22.In a digital oscilloscope, the A/D converters are usually

ramp type

flash type

integrating type

successive approximate type

Your Answer:Correct

Your Answer:Incorrect

Question 23 of 30

Q-23.An 0 – 10 A ammeter has a guaranteed accuracy of 1 percent of full scale deflection. The limiting error while reading 2.5 A is :

none of the above.

Your Answer:Correct

Your Answer:Incorrect

Question 24 of 30

Q-24.Electronic voltmeters which use rectifiers employ negative feedback. This is done

To increase the overall gain

To improve stability

To overcome nonlinearity of diodes

None of the above.

Your Answer:Correct

Your Answer:Incorrect

Question 25 of 30

Q-25.An operational amplifier has an open loop gain of 200000Ω.its output exhibits saturation at 10 V. the threshold differential voltage of the amplifier is:

25 µV

50 µV

0.5 mV

10 V

Your Answer:Correct

Your Answer:Incorrect

Question 26 of 30

Q-26.A moving iron voltmeter reads low for a.c voltages than for corresponding values of d.c voltages. The meter can made to read equally for both a.c and d.c voltages

If the resistance of the multiplier is made very high

If the inductance of coil is made small

If the resistance of the coil is made very large

If the multiplier resistance is shunted by a capacitor of appropriate value to make the circuit non-inductive.

Your Answer:Correct

Your Answer:Incorrect

Question 27 of 30

Q-27.The potentiometer is standardised for making it

precise

accurate

accurate and precise

accurate and direct reading

Your Answer:Correct

Your Answer:Incorrect

Question 28 of 30

Q-28.The power in a d.c circuit is measured with the help of ammeter and a voltmeter. The voltmeter is connected on the load side.the power indicated by the product of reading of two instruments (VI) is :

The power consumed in the load

The sum of power consumed by the load and the voltmeter

The sum of power consumed by the load and ammeter

None of the above.

Your Answer:Correct

Your Answer:Incorrect

Question 29 of 30

Q-29.The voltage sensitivities of Barium titanate and Quartz are respectively 12 × 10^-3 Vm/N and 50 × 10^-3 Vm/N. their respective permittivity’s are 12.5 × 10^-9 F/m and 40.6 × 10^-12 F/m. what are their charge sensitivities?

1.04 × 10⁶ C/N, 1.23 × 10⁹ C/N

150 pC/N, 2 pC/N

20 pC/N, 50 pC/N

None of the above.

Your Answer:Correct

Your Answer:Incorrect

Question 30 of 30

Q-30.A vibration galvanometer is to be turned to a frequency of 50 Hz. The ratio of its control constant to inertia constant should be

98696

2500

132 × 10^-6

None of the above.

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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