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.Post acceleration is needed in a CRO if the frequency of the signal is :

Less than 1MHz

More than 1MHz

More than 10MHz

More than 10Hz.

Your Answer:Correct

Your Answer:Incorrect

Question 2 of 30

Q-2.A triangular wave shape is obtained :

By integrating a square wave

By differentiating a sine wave

By differentiating a square wave

By integrating a sine wave

Your Answer:Correct

Your Answer:Incorrect

Question 3 of 30

Q-3.The errors in current transformer can be reduced by designing them with :

High permeability and low loss core materials, avoiding any joints in the core and also keeping the flux density to a low value

Using primary and secondary windings as close to each other as possible

Using large cross section for both primary and secondary windings conductors

All the above

Your Answer:Correct

Your Answer:Incorrect

Question 4 of 30

Q-4.Low resistance are provided with four terminals

To facilitates the connection of current and potential circuits

In order that the resistance value becomes definite irrespective of the nature of contacts at the terminals

To eliminate the effect of thermo-electric emfs

To eliminate the effect of leads

Your Answer:Correct

Your Answer:Incorrect

Question 5 of 30

Q-5.A null type of instruments as compared to deflection type instrument has

a higher accuracy

a lower sensitivity

a faster response

all of the above

Your Answer:Correct

Your Answer:Incorrect

Question 6 of 30

Q-6.if the confidence level is 0.95, then the value lying outside the confidence interval are:

1 in 5

1 in 20

1 in 100

1 in 1000.

Your Answer:Correct

Your Answer:Incorrect

Question 7 of 30

Q-7.When the secondary winding of a potential transformer is suddenly open circuited with primary winding excited :

Large voltages are produced in the secondary winding may be safety hazard to operating personnel

The large voltages so produced may rupture the insulation

The primary winding draws only the no load current

None of the above.

Your Answer:Correct

Your Answer:Incorrect

Question 8 of 30

Q-8.In a series type of ohmmeter the zero adjustment should be done

By changing the value of series resistance

By changing the value of shunt resistance connected across meter movement

By changing both series as well as shunt resistance

By changing the battery voltage.

Your Answer:Correct

Your Answer:Incorrect

Question 9 of 30

Q-9.A volt-ratio box is designed with a resistance 100 Ω/V. it has input terminals of 300V, 150V and 75 V, and an output terminal of 1.5 V which is connected to the potentiometer. Supposing a voltage of 270V is connected to the 300 V terminals, what is voltage indicated by the potentiometer and what is the power consumption under null conditions?

1.5 V, 3W

1.35 V, 3W

1.5 V,2.43W

1.35 V, 2.43W.

Your Answer:Correct

Your Answer:Incorrect

Question 10 of 30

Q-10.In optical fibres, if the total reflection is to take place, the following conditions must be satisfied______Where n₁ and n₂ are respectively refractive indices of core and cladding and Φ₁ is angle of incidence.

n₂ < n₁ and Φ₁> cos^-1(n₂/ n₁)

n₁ < n₂ and Φ₁< cos^-1(n₂/ n₁)

n₂ < n₁ and Φ₁< cos^-1(n₂/ n₁)

n₂ > n₁ and Φ₁> cos^-1(n₂/ n₁)

Your Answer:Correct

Your Answer:Incorrect

Question 11 of 30

Q-11.An LVDT

Has a very good frequency response as the mass of the core to which the input signal is applied is fairly large

Is immune to stray magnetic fields

Has a zero voltage at the null point even if the supply voltage contains and harmonics and even if the two secondary windings are not exactly similar and even asymmetrically placed with respect to primary winding

None of the above.

Your Answer:Correct

Your Answer:Incorrect

Question 12 of 30

Q-12.An operational amplifier has a bandwidth of 100kHz. Negative feedback is introduced with a loop gain of 50. The bandwidth with feedback is

2kHz

49kHz

5.1MHz

1.96kHz.

Your Answer:Correct

Your Answer:Incorrect

Question 13 of 30

Q-13.A cadmium sulphide cell has the highest response for a light of wavelength of nearly

300 nm

800 nm

500 nm

600 nm

Your Answer:Correct

Your Answer:Incorrect

Question 14 of 30

Q-14.The size of the potential transformers :

a. Is the same as that of power transformers of the same VA rating

Is much greater than that of power transformers of the same VA rating because they are designed for low ratio and phase angle errors which require large sized cores and winding conductors

Is smaller than that power transformers of the same VA rating

None of the above.

Your Answer:Correct

Your Answer:Incorrect

Question 15 of 30

Q-15.A current transformer has a rating of 100/5 A. its magnetizing and loss components of the exciting current are 1 A and 0.6 A respectively and secondary winding burden is purely resistive, its transformation ratio at rated current is :

20.12

20.2

200.2

None of the above

Your Answer:Correct

Your Answer:Incorrect

Question 16 of 30

Q-16.A heliport is used for measurement of linear displacement of 0.1 m. it uses a 10 turn potentiometer (3000 of movement full scale) with a total of 5000 turns of wire. Its resolution is

0.1 mm

0.2 mm

0.01 mm

0.02 mm.

Your Answer:Correct

Your Answer:Incorrect

Question 17 of 30

Q-17.A 741 OPAMP has,

6 pins

7 pins

8 pins

9 pins

Your Answer:Correct

Your Answer:Incorrect

Question 18 of 30

Q-18.A coherent system of units is to be evolved which has N kinds of quantities to evaluate and M independent physical quantities expressing relationship between them, we can independently choose the sizes of units of :

N+M quantities

N-M quantities

N quantities

M quantities

Your Answer:Correct

Your Answer:Incorrect

Question 19 of 30

Q-19.In the center zero analog ammeter having a range of -10 A + 10 A, there is a detectable change of the pointer from its zero position on either side of the scale only if the current reaches a value of 1A(on either side).The ammeter has a

resolution of 1A

dead zone of 1A

dead zone of 2 A

Sensitivity of 1 A.

Your Answer:Correct

Your Answer:Incorrect

Question 20 of 30

Q-20.Dynamic response consists of:

Two parts, one steady state and the other transient state response

Only transient state response

Only steady state response

Steady state and transient frequency response.

Your Answer:Correct

Your Answer:Incorrect

Question 21 of 30

Q-21.A DVM measures

peak value

rms value

average value

peak to peak value

Your Answer:Correct

Your Answer:Incorrect

Question 22 of 30

Q-22.The electric strength of new insulating oil should have a minimum strength (r.m.s) of

30 kV / mm

3 Kv/mm

50 kv/mm

5 kv/mm

Your Answer:Correct

Your Answer:Incorrect

Question 23 of 30

Q-23.In the sweep generator, if the output is connected to the input of a spectrum analyser then

a single vertical can be observed

a single horizontal line can be observed

a sawtooth wave can be observed

lot of random lines can be observed

Your Answer:Correct

Your Answer:Incorrect

Question 24 of 30

Q-24.The 0-10V A/D converter has to have a , resolution of 0.025 percent. Find the r.m.s value of quantization error.

176 µV

705 µV

352 µV

1410 µV

Your Answer:Correct

Your Answer:Incorrect

Question 25 of 30

Q-25.The breaking torque provided by a permanent magnet in a single phase energy meter is proportional to the

Square of the flux of the permanent magnet

Speed of the meter

Distance of the permanent magnet from the centre of revolving disc

All the above.

Your Answer:Correct

Your Answer:Incorrect

Question 26 of 30

Q-26.The correct TTL logic levels are

0–0.8 V and 2.0–5.0 V

0–0.4 V and 2.4–5.0 V

0 V and 5 V

0–0.1 V and 4.9–5.0 V

Your Answer:Correct

Your Answer:Incorrect

Question 27 of 30

Q-27.One of the following can act as an inverse transducer

Electrical resistance potentiometer

L.V.D.T

Capacitive transducer

Piezo electric crystals

Your Answer:Correct

Your Answer:Incorrect

Question 28 of 30

Q-28.Feedback oscillator have a closed loop gain of

G/(1-GH)

G/(1+GH)

G/(1±GH)

H/(1+ GH)

Your Answer:Correct

Your Answer:Incorrect

Question 29 of 30

Q-29.For the bridge shown in figure above Z₁= 200Ω ∠30°, Z₂= 150Ω ∠0°, Z₃= 250Ω ∠-40°. In order that the bridge can be balanced Z₄should be :

187.5Ω ∠-70°

187.5Ω ∠-10°

333.3Ω ∠10°

120Ω ∠70°

Your Answer:Correct

Your Answer:Incorrect

Question 30 of 30

Q-30.For a 3 phase, moving iron synchroscopeF₂= frequency of incoming machineF₁= frequency of busbars At equilibriumΦ = ±2πf’t + ɑ ; where f’ = F₂- F_1.If f’ is positive

The incoming machine is faster

The incoming machine is slower

The incoming machine can be synchronized to the busbars

None of the above.

Your Answer:Correct

Your Answer:Incorrect

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