Electrical & Electronics Measurements Objective Questions – Set 5

Which of the following quantities consists of S.I. unit as Hertz?

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

A 8085 microprocessor consist of

A thermometer having first order dynamics is subjected to a sudden temperature change of 30°c to 150°c. If it has he time constant of 5 sec, what temperature will be indicated by after 5 sec?

The measurement of a quantity

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 ?

An ammeter of range 0-25 A has a guaranteed accuracy of 1% of full-scale reading. The current measured by the ammeter is 5 A. The limiting error in the reading is

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

Kelvines double bridge is used to measure low resistance because

For a circuit given that I = 2 ± 5 % A, R = 100 ± 0.2 % Ω the limiting error in the power dissipation I² R in the resistor R is

A moving coil of a meter has 100 turns, and a length and depth of 10 mm and 20 mm respectively. It is positioned in a uniform radial flux density of 200 mT. The coil carries a current of 50 mA. The torque on the coil is

To the y input of a CRO a signal defined by 10sin100t is applied. To the x input the signal 10cos100t is fed. The gain for both x-channel and y-channel is the same. The screen shows

The internal resistance of Weston standard cell is of order of

A voltmeter has 100 scale divisions and can measure up to 100 V. Each division can be read to ½ division. The resolution of the voltmeter is

The internal resistance of a saturated Western Cell is of order of a

The maximum percentage error in the sum of two voltage measurements when V₁ = 100V ± 1% and V₂ = 80V ± 5% is

The difference between the measured value and the true value is called

Schering bridge is used to measure which of the following?

An electrodynamic meter can be used to measure

Attraction and repulsion type instruments are the two different types of which instrument ?

The effect of stay megnetic fields on the actuating torque of a portable instrument is maximum when the operating field of the instrument and stay fields are

In a wheatstone bridge, a change of 6 Ω in the unknown arm of bridge is required to produce a change in deflection of 2.4 mm of the galvanometer. The sensitivity is

A resistance of 105 ohms is specified using significant figures as indicated below : 1. 105 ohms 2. 105.0 ohms 3. 0.000105 mega ohms Among these,

An average reading digital multimeter reads 10 V when fed a triangular wave, symmetric about the axis. For the same input, an rms reading meter will read

Two meters X and Y require 40 mA and 50 mA, Respectively, to give full-scale Deflection, then

Which of the following meter is most suitable for measuring radio frequency currents?

Following is a 16-bit register for 8085 microprocessor

The errors introduced by an instrument fall in which category ?

A 150 V moving iron voltmeter of accuracy class 1-0 reads 75 V when used in a circuit under standard condition. The maximum possible percentage error in the reading is

The main advantage of Anderson bridge over Maxwell bridge is that