MEASUREMENT AND INSTRUMENTATION QUIZ

A bridge circuit is shown in the figure below. Which one of the sentence given below is most suitable for balancing the bridge?

First adjust R2 and then adjust R4.

First adjust R4 and then adjust R2.

First adjust R2 and then adjust R3.

First adjust R4 and then adjust R1.

TRUE ANSWER : ?
YOUR ANSWER : ?

The resistance can be measured most accurately by

Bridge method

Voltmeter-ammeter method

Megger

Multimeter

TRUE ANSWER : ?
YOUR ANSWER : ?

The internal resistance of an ammeter should be

Very small

High

Infinity

Medium

TRUE ANSWER : ?
YOUR ANSWER : ?

The resistance of a circuit is measured from the relation R= P/I2, where P is the power fed into the circuit and I is the current flowing through it. If the limiting errors in the measurement of power and current are respectively ± 1.0% and ± 1.0%, then what will be the limiting error in measurement of resistance ?

± 1.5%

±0.5%

± 3.0%

±3.5%

TRUE ANSWER : ?
YOUR ANSWER : ?

The resistance of a circuit is found by measuring current flowing and the power fed into the circuit. If the limiting errors in the measurement of power and current are ± 1.5% and ± 1.0% respectively, the limiting error in the measurement of resistance

± 1.5%

± 1%

± 2.5%

± 3.5%

TRUE ANSWER : ?
YOUR ANSWER : ?

Assertion (A) : Precision is a necessary prerequisiteof accuracy. Reason (R) : Precision guarantees accuracy.

A is false bur R is true

Both A and R are true but R is NOT the correct explanation of A

A is true but R is false

Both A and R are true and R is the correct explanation of A

TRUE ANSWER : ?
YOUR ANSWER : ?

Two voltmeters have the same range 0-400V. The internal impedance are 30,000 Ohms and 20,000 Ohms. If they are connected in series and 600V be applied across them, the readings are

400V and 200V

300V each

One of the meters out of the range and other 100V

360V and 240V

TRUE ANSWER : ?
YOUR ANSWER : ?

For measuring an AC voltage by an AC potentiometer it is desirable that the supply for the potentiometer is taken from

A battery.

Any of above.

The same source as the unknown voltage.

A source other than the source of unknown voltage.

TRUE ANSWER : ?
YOUR ANSWER : ?

It is found that 10A current passes through a resistor of 10°hms. The resistor has 5% tolerance . The error in measurement of current can be as high as 5%. What is max error in measurement of power, calculated from measured value of I and the nominal value of resistor?

150W

50W

200W

100W

TRUE ANSWER : ?
YOUR ANSWER : ?

The operating voltage of a megger is about

12 V

40 V

100 V

6 V

TRUE ANSWER : ?
YOUR ANSWER : ?

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