Electrical And Electronic Measurement MCQs

Question 1

Galvanometer type recorders uses

Accepted Answer

vibration galvanometer

Answer

ballistic galvanometer

Answer

D' Arsonval galvanometer

Answer

tangent galvanometer

Question 2

The limiting error of measurement of Power consumed by and the current Passing through a resistance are th1.5% and 1% respectively. Then the limiting be error of measurement of resistance will

Accepted Answer

? 3.5%

Answer

? 0.5%

Answer

? 1.0%

Answer

? 2.5%

Question 3

For the voltmeter circuit shown in the given figure, the basic D' Arson val meter used has full-scale current of 1 m A and meter resistance (Rm) of 100 ohms. The values of the series resistance Ri and R2 required for 10 V range and 50 V range will be respectively and

Accepted Answer

sinusoidal

Answer

a straight line

Answer

an ellipse

Answer

a circle

Question 4

Electronic voltmeter provides more accurate readings in high resistance circuit as compared to a non-electronic voltmeter because of its

Accepted Answer

high ohmN ratings

Answer

high V/ohm ratings

Answer

low meter resistance

Answer

high resolution

Question 5

Modern electronic multimeters measure resistance by

Accepted Answer

forcing a measuring the voltage across the unknown resistance

Answer

using a bridge circuit

Answer

using an electronic bridge compensator for nulling

Answer

colour coding technique ant current

Question 6

In the case of power measurement by two wattmeter method in a balanced 3-phase system with a pure inductive load

Accepted Answer

both the wattmeters will indicates the same value but with opposite signs

Answer

both the wattmeter will indicate zero

Answer

both the wattmeter will indicate the same value with same sign

Answer

one wattmeter will indicate zero and the other will indicate some non-zero value

Question 7

A 230V, 104, single-phase energymeter makes 90 revolutions in 3 minutes at half load rated voltage and unity pf. If the eter constant is 1800 revolutions/kWh, hen its error at half load will be

Accepted Answer

15 % slow

Answer

13.04% slow

Answer

13.04% fast

Answer

15 % fast

Question 8

strain gauge bridge measures the rain in a cantilever where the gauge fixed. With strain E, the gauge resistance increases from to 0.52 O. If the gauge factor is 2.03, then strain in the cantilever will be

Accepted Answer

2.06 x 10-3

Answer

2.03x 16-3

Answer

3.81 x 10-3

Answer

4.33 x 10-3

Question 9

piezo electric transducer has the owing parameter values: tal capacitance = 10-9 F le capacitance = 2 x 10-10 F ge sensitivity = 4 x 10-6 coulomb/cme oscilloscope used for read-out has put resistance of 1 MW in parallel C = 4 x 10-10 F, then the voltage ivity constant will be

Accepted Answer

00 V/cm

Answer

3334 V/cm

Answer

4500 V/cm