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

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Question 1 of 30

Q-1.The resistance of thermometer is 5 Ω at 30°C and 6.5 Ω at 60°C. using linear approximation, the value of resistance temperature co-efficient at 45°C

0.009/°C

0.0087/°C

0.0085/°C

0.01/°C.

Your Answer:Correct

Your Answer:Incorrect

Question 2 of 30

Q-2.when measuring power with the electrodynamometer wattmeter in a circuit having a low power factor :

the current coil should be connected on the load side

the current coil should be connected on the supply side

the pressure coil should be connected on the load side

a compensated wattmeter with pressure coil connected on the load side should be used.

Your Answer:Correct

Your Answer:Incorrect

Question 3 of 30

Q-3.P₁phosphor material is used for display in CRTs for:

Photographic applications

General purpose applications

Television applications

All the above.

Your Answer:Correct

Your Answer:Incorrect

Question 4 of 30

Q-4.The power requirement of LED is

40 mW per numeral

40 µW per numeral

10 W per numeral

10 µW per numeral

Your Answer:Correct

Your Answer:Incorrect

Question 5 of 30

Q-5.While measuring liquid level with fibre optic transducers, the fibre rod or cable is cut in the form of

Sphere

Rectangle

Prism

None of the above.

Your Answer:Correct

Your Answer:Incorrect

Question 6 of 30

Q-6.Time scale of a strip chart recorder is controlled by

controlling speed of the chart paper

controlling the stylus drive mechanism

controlling the range selector

controlling the stylus

Your Answer:Correct

Your Answer:Incorrect

Question 7 of 30

Q-7.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 8 of 30

Q-8.A closed coil spring has a stiffness of 20 × 10^-6N/m. Suppose the diameter of the wire is doubled, its outer diameter is made two times and its number of turns are made 2 times, the stiffness of new spring would be

20 × 10^-6 N/m

80 × 10^-6 N/m

10 × 10^-6 N/m

160 × 10^-6 N/m

Your Answer:Correct

Your Answer:Incorrect

Question 9 of 30

Q-9.The power consumption PMMC instrument is typically about :

0.25 W to 2 W

0.25 mW to 2 mW

25 µW to 200 µW

None of the above.

Your Answer:Correct

Your Answer:Incorrect

Question 10 of 30

Q-10.A random noise generator produces a signal

Whose amplitude varies randomly

Which has no periodic frequency

Has unpredictable power spectrum

All the above

Your Answer:Correct

Your Answer:Incorrect

Question 11 of 30

Q-11.A resistance of value 10Ω approximately is to be measured by ammeter-voltmeter method with resistance of ammeter is 0.02Ω and that of voltmeter is 5000Ω. The resistance should be measured

By connecting the ammeter on the side of unknown resistance as this connection gives better accuracy

By connecting the voltmeter on the side on unknown resistance as this connection gives better accuracy

By any of the two connections, as both of them give equal accuracy

None of the above.

Your Answer:Correct

Your Answer:Incorrect

Question 12 of 30

Q-12.Light load adjustment for induction type energy meters are usually done at :

10% of full load current

5% of full load current

50% of full load current

1% of full load current.

Your Answer:Correct

Your Answer:Incorrect

Question 13 of 30

Q-13.A dc circuit can be represented by an internal voltage source of 50 V with an output resistance of 100 kW. In order to achieve 99% accuracy for voltage measurement across its terminals, the voltage measuring device should have

a resistance of at least 10 W

a resistance of 100 kW

a resistance of at least 10 MW

none of the above

Your Answer:Correct

Your Answer:Incorrect

Question 14 of 30

Q-14.In a single phase induction type energy meter, the lag adjustment is done :

To make the coil flux to lag 90° behind the applied voltage

To make the pressure coil flux to lag 90° behind the applied voltage

To bring the pressure coil flux in phase with the applied voltage

None of the above.

Your Answer:Correct

Your Answer:Incorrect

Question 15 of 30

Q-15.What is the order of minimum displacement that can be measured with capacitive transducers?

1 cm

1 mm

1 µm

1 × 10^-12 m

Your Answer:Correct

Your Answer:Incorrect

Question 16 of 30

Q-16.In a CRT the focusing anode is located

Between pre-accelerating and accelerating anodes

After accelerating anodes

Before pre-accelerating anode

None of the above.

Your Answer:Correct

Your Answer:Incorrect

Question 17 of 30

Q-17.Screw adjustments are preferred over shunt resistance adjustments for zero calibration in ohmmeters because

the former method is less costly

the former method does not disturb the scale calibration

the former method does not disturb the meter magnetic field

all of the above

Your Answer:Correct

Your Answer:Incorrect

Question 18 of 30

Q-18.The transformation ratio in the case of a potential transformer us defined as ratio of :

Primary winding voltage / secondary winding voltage

Rated primary winding voltage / rated secondary winding voltage

Number of turns of primary winding / number of turns of secondary winding

All the above.

Your Answer:Correct

Your Answer:Incorrect

Question 19 of 30

Q-19.The power in 3 phase circuit is measured with the help of 2 wattmeters. The reading of the one of the wattmeters is positive and that of the other is negative. The magnitude of reading is different. it can concluded that the power factor of the circuit is :

Unity

Zero (lagging)

0.5 (lagging)

Less than 0.5 (lagging)

Your Answer:Correct

Your Answer:Incorrect

Question 20 of 30

Q-20.For a second order system, the settling time for ±2% band is _____________Where ξ = damping factor and ω_η = natural frequency : rad/s.

3/(ξω_η )

5/(ξω₀ )

2ξω_η

4/(ξω_η )

Your Answer:Correct

Your Answer:Incorrect

Question 21 of 30

Q-21.Radiometry refers to measurement of optical radiations

From a wavelength of 370 nm – 770 nm

From a wavelength of 10^-12 nm to 10⁶ nm

From a wavelength of 10² nm to 10⁶ nm

From a wavelength of 10 nm to 10⁶ nm

Your Answer:Correct

Your Answer:Incorrect

Question 22 of 30

Q-22.Which of the following statements is not correct for a storage-type oscilloscope?

Secondary emission electrons etch a positively charged pattern

The flood guns used for display, emit high velocity electrons

The flood guns are placed between the deflection plates and storage target.

The storage target is a conductive mesh covered with magnesium fluoride.

Your Answer:Correct

Your Answer:Incorrect

Question 23 of 30

Q-23.A slide wire potentiometer has 10 wires of 1 m each. With the help of a standard voltage source of 1.018 volt it is standardise by keeping the jockey at 101.8 cm. If the resistance of the potentiometer wire is 1000 Ω then the value of the working current is

1 mA

0.5 mA

0.1 A

10 mA

Your Answer:Correct

Your Answer:Incorrect

Question 24 of 30

Q-24.The reason why eddy-current damping cannot he used in a moving-iron instrument, is

they have a strong operating magnetic field

they are not normally used in vertical position

they need a large damping force which can only he provided by air friction

they have a very weak operating magnetic field and introduction of a permanent magnet required for eddy current damping would distort the operating magnetic field

Your Answer:Correct

Your Answer:Incorrect

Question 25 of 30

Q-25.The maximum current that can be drawn from a saturated Weston Cell without damaging it,is

100MA momentarily

100µA continuously

100 µA momentarily

1 mA momentarily

Your Answer:Correct

Your Answer:Incorrect

Question 26 of 30

Q-26.Modem is an acronym of

Modulation

Demodulation

Modulation and demodulation

All the above.

Your Answer:Correct

Your Answer:Incorrect

Question 27 of 30

Q-27.The sensitivity of thermistors as compared with sensitivity of platinum resistance temperature detector over a temperature range of -100°C to 400°C to changes in temperature is

100 times

10⁶ times

10⁷ times

10⁰ times

Your Answer:Correct

Your Answer:Incorrect

Question 28 of 30

Q-28.A first order system is subjected to a step input. its time constant can be defined as :

Time for the output to rise to 63.2% of its final steady value in the case of rising output.

Time for the output to drop to 36.8% of its initial value in the case of a decaying output.

Time for the output to rise( in case of rising output) reach its final steady value if the initial rate of change of output is maintained

All of the above.

Your Answer:Correct

Your Answer:Incorrect

Question 29 of 30

Q-29.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 30 of 30

Q-30.A digital voltmeter uses an A/D converter which needs a start pulse, use an analog comparator and has a relatively fixed conversion time independent of the applied voltage.The A/D converter is

Successive approximation converter

Digital ramp converter

Divial slope converter

All the above.

Your Answer:Correct

Your Answer:Incorrect

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