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.Frequency can be measured using

Anderson’s bridge

Maxwell’s bridge

De Sauty’s bridge

Wien’s bridge

Your Answer:Correct

Your Answer:Incorrect

Question 2 of 30

Q-2.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 3 of 30

Q-3.The voltage 10 cos ωt and V cos (ωt + α) are applied to the X and Y plates of a CRO. The Lissajous figure observed on the screen is a straight line of 60° to the positive axis. Then

V = 10, α = 60°

V = 10, α = 0°

V = 10 , α = 60°

V = 10 , α = 0°

Your Answer:Correct

Your Answer:Incorrect

Question 4 of 30

Q-4.The area of the hysteresis loop in magnetic specimen indicates

hysteresis and eddy current loss

hysteresis loss

hysteresis loss per unit volume

hysteresis loss per unit volume per cycle of frequency

Your Answer:Correct

Your Answer:Incorrect

Question 5 of 30

Q-5.Platinum is the commonly used metal for RTDs this is because

Platinum has a constant value of resistance temperature co-efficient of 0.004°C for a temperature range between 0 to 100°C

The resistivity of platinum tends to increase less rapidly at higher temperatures

Platinum is available in pure form for commercial applications and has a stability over higher ranges of temperature

All the above.

Your Answer:Correct

Your Answer:Incorrect

Question 6 of 30

Q-6.An average reading VTVM uses one diode connected in series with an external resistance. A high value of series resistance is used so that the instrument should have :

A high input impedance

A linear v – i characteristics

Low power consumption

All the above.

Your Answer:Correct

Your Answer:Incorrect

Question 7 of 30

Q-7.Over voltages may hamper rotation of the disc in induction-type energy meters since

the pressure coil flux no longer remains in quadrature with the current coil flux

dynamically induced emf in the disc from the pressure coil flux produces a self-braking torque

effect of the brake magnet is enhanced

all of the above

Your Answer:Correct

Your Answer:Incorrect

Question 8 of 30

Q-8.An astable multivibrator uses a resistance of 100 kΩ and a capacitance of 0.01 µF. the frequency of square waves generated by it is

924 Hz

593 Hz

693 Hz

110 Hz

Your Answer:Correct

Your Answer:Incorrect

Question 9 of 30

Q-9.The voltage control circuit cannot use resistance potential dividers because:

They involve a large power loss

They cause distortion of waveform

They do not give smooth variation of voltage

They have non-linear characteristics

Your Answer:Correct

Your Answer:Incorrect

Question 10 of 30

Q-10.Strain guage rosettes are used

When the direction of principal stress is known

When the direction of principal stress is not known

When the direction of hoop stress is not knows

When the direction of longitudinal stress is not known

Your Answer:Correct

Your Answer:Incorrect

Question 11 of 30

Q-11.Nominal ratio of a current transformer is

ratio of primary winding current to secondary winding current

ratio of rated primary winding current to rated secondary winding current

ratio of number of turns in the primary to number of turns in the secondary

all of the above

Your Answer:Correct

Your Answer:Incorrect

Question 12 of 30

Q-12.In an LVDT the core is made up of a

Non-magnetic material

A solid ferro-electric material

High permeability, nickel-iron haydrogen annealed material in order to produce low harmonics, low null voltage, and high sensitivity. The core is slotted to reduce eddy current losses

All the above.

Your Answer:Correct

Your Answer:Incorrect

Question 13 of 30

Q-13.Overload errors in induction-type energy meters can be reduced by

designing the meter to run at lower rated speeds

designing the current coil flux to have lower rated values as compared to pressure coil flux

providing magnetic shunts along with series magnets that saturate at higher loads

all of the above

Your Answer:Correct

Your Answer:Incorrect

Question 14 of 30

Q-14.The ratio and phase angle errors in potential transformers may be reduced by

Increasing the exciting current

Increasing the resistance and leakage reactance in the transformer

By not employing turns compensation

None of the above.

Your Answer:Correct

Your Answer:Incorrect

Question 15 of 30

Q-15.In electrodynamometer-type wattmeters, current coil is made of two sections

to reduce power loss

to produce uniform magnetic field

to prevent Eddy-current loss

to reduce errors due to stray magnetic field

Your Answer:Correct

Your Answer:Incorrect

Question 16 of 30

Q-16.Two sets of readings are taken in a Kelvin’s double bridge with the battery polarity reversed in order to

eliminate the error due to contact resistance

eliminate the error due to thermo-electric effect

eliminate the error due to change in battery voltage

all of the above

Your Answer:Correct

Your Answer:Incorrect

Question 17 of 30

Q-17.When using a.c signal conditioning system for capacitive transducers , the carrier frequencies,

Range between 50 Hz an 20 kHz

Should be of the order of 0.5 MHz

Should be of the order of 20MHz

None of the above.

Your Answer:Correct

Your Answer:Incorrect

Question 18 of 30

Q-18.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 19 of 30

Q-19.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 20 of 30

Q-20.An LCD requires a power of______To light up one segment of a seven segmented display system

20 W

20 mW

20 µW

20 nW

Your Answer:Correct

Your Answer:Incorrect

Question 21 of 30

Q-21.A milliammeter of resistance 100Ω is connected in series with a circuit. Its power consumption is 0.1 mW. Supposing it is replaced with a milliammeter of 200Ω resistance the power consumption will be

0.2 mW

0.05 mW

0.1 mW

None of the above.

Your Answer:Correct

Your Answer:Incorrect

Question 22 of 30

Q-22.LVDT can be used for

angular velocity measurement of a column

load measurement

vibration measurement

force measurement in a beam

Your Answer:Correct

Your Answer:Incorrect

Question 23 of 30

Q-23.The photo-diode as compared to a photo-transistor has

Faster switching time

Lower sensitivity

Higher size for the same value of output current

All the above.

Your Answer:Correct

Your Answer:Incorrect

Question 24 of 30

Q-24.An OPAMP having an open loop gain of A_vol is designed with feed factor β where β = R₁/(R₁+ R_f ) is the input resistance connected to non-inverting end and R is the resistance in the feedback path, the closed loop gain is :

-R_f/R₁ [ 1/(1+(1/A_vol β))]

R_f/R₁ [ 1/(1+(1 + A_vol β))]

R_f/R₁ [ 1/(1+(1 - A_vol β))]

-R_f/R₁ [ 1/(1+(1 + A_vol β))]

Your Answer:Correct

Your Answer:Incorrect

Question 25 of 30

Q-25.A chopper stabilized a.c amplifier may use :

An electro-mechanical chopper

Bipolar transistors as choppers

MOS field effect transistors as chopper

Light activated devices as chopper

All the above.

Your Answer:Correct

Your Answer:Incorrect

Question 26 of 30

Q-26.A vibration galvanometer is tuned

By changing the length and tension of vibrating coil

By attaching weights to vibrating coil

By changing its damping constant

All the above.

Your Answer:Correct

Your Answer:Incorrect

Question 27 of 30

Q-27.A linear displacement transducer (digital) normally uses

Straight binary code

BCD

Gray code

Hexadecimal code

Your Answer:Correct

Your Answer:Incorrect

Question 28 of 30

Q-28.A current transformer has a rating of 1000/5 A. its magnetizing current and loss component of exciting current are 10 A and 6 A respectively. The phase angle between secondary winding induced voltage and current is 30°. The phase angle error of the transformer at rated current is :

0.65°

0.305°

0.496°

None of the above.

Your Answer:Correct

Your Answer:Incorrect

Question 29 of 30

Q-29.Which of the following statements is NOT correct?

The status of each input can be checked from one location and outputs can be forced on and off

All symbols in the RLL represent actual components and contacts present in the control system

PLCs are not as reliable as electromechanical relays in RLL

Input (-| |-) and output (- ( ) -) instruction symbols in the ladder logic represent only data values stored in PLC memory

Your Answer:Correct

Your Answer:Incorrect

Question 30 of 30

Q-30.A short-circuiting link is provided on the secondary side of a CT to

allow high current to flow in the primary when the secondary winding of the CT is short circuited with the link

allow adjustments to be made in the secondary side, like replacing the ammeter, with the primary energized but the short circuiting link in use

enable primary current to drop down to zero when the secondary is open circuited with the short circuiting link in use

all 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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