# BSNL TTA ONLINE TEST - 4 Instruments and Measurements

### Description

Subject : Instruments and Measurements Instruction: Time limit for the exam: 25 Minutes Total number of questions : 30 Q Each question carry 1 mark, no negative marks. DO NOT refresh the page. All the best by BSNL ACADEMY If U Like Our Test series than Share with your friends and Rate Our Tests.
Quiz by BSNL ACADEMY, updated more than 1 year ago More Less
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## Resource summary

### Question 1

Question
Which one of the following meters has maximum loading effect on the circuit under measurement ?
• 1000 Ω/volt
• 10 MΩ/volt
• 100 Ω/volt
• 1 MΩ/volt

### Question 2

Question
A 150 V moving iron voltmeter of accuracy class 1.0 reads 75 V when used in a circuit under standard conditions. The maximum possible percentage error in the reading is
• 0.5
• 1.0
• 2.0
• 4.0

### Question 3

Question
To measures 5 volts, if one selects a 0-100 volt range voltmeter which is accurate with in ± 1%, then the error in this measurement may be up to
• 10 %
• 20 %
• 30 %
• 40 %

### Question 4

Question
Assertion (A) : It is always desirable to take the reading of an indicating instrument very close to the full scale reading. Reason (R) : Accuracy of an indicating instrument is maximum at the full scale deflection and error increases as reading comes closer to the beginning of the scale.
• A is true but R is false
• A is false bur R is true
• Both A and R are true and R is the correct explanation of A
• Both A and R are true but R is NOT the correct explanation of A

### Question 5

Question
If an ammeter is to be used in place of a voltmeter, we must connect with the ammeter a
• High resistance in parallel
• High resistance in series
• Low resistance in parallel
• Low resistance in series

### Question 6

Question
In eddy current damping system, the disc employed should be of
• Conducting and magnetic material
• Conducting but non-magnetic material
• Magnetic but non-conducting material
• Non-conducting and non-magnetic material

### Question 7

Question
Which of the following can act as in inverse transducer?
• LVDT
• Strain
• Piezo electric crystal
• Bimetal strip

### Question 8

Question
The total current I = I1 + I2 in a circuit is measured I1 = 150 ± 3A , I2 = 250 ± 4 A, where the limits of error are given as standard deviations. I is measured as
• (400 ± 3) A
• (400 ± 2.24) A
• (400 ±5) A
• (400 ± 1) A

### Question 9

Question
A first order instrument is characterized by
• Static sensitivity and damping coefficient
• Time constant only
• Static sensitivity and time constant
• Static sensitivity, damping coefficient and natural frequency of oscillations

### Question 10

Question
The ratio of change in output to the change in the input is called
• precision
• resolution
• sensitivity
• repeatability

### Question 11

Question
The difference between the indicated value and the true value of a quantity is
• Dynamic error
• Gross error
• Absolute error
• Relative error

### Question 12

Question
Which one the following statements is correct ? The application of the instrument in wrong manner in the procedure of measurement results in a/an
• instrument error
• random error
• systematic error
• gross error

### Question 13

Question
Two capacitance, C1 = 150 ± 2.4µF and C2 = 120 ± 1.5 µF are connected in parallel. What is the limiting error of the resultant capacitance C (in µF) ?
• 3.9µF
• 2.4µF
• 1.5µF
• 0.9µF

### Question 14

Question
Dynamic errors are caused by
• instrument not responding fast
• human error
• environmental error
• observational error

### Question 15

Question
Consider the following statements : In a measuring instrument, 1. Linearity is more important than sensitivity. 2. High precision indicates high accuracy 3. Accuracy cannot be better than resolution. Of these statements
• 1 and 3 are correct
• 1 and 2 are correct
• 1, 2 and 3 are correct
• 2 and 3 are correct

### Question 16

Question
A resistance is measured by the voltmeter-ammeter method employing dc excitation and a voltmeter of very high resistance connected directly across the unknown resistance. If the voltmeter and ammeter reading are subject to maximum possible errors of ± 2.4 % and ± 1.0 % respectively, then the magnitude of the maximum possible percentage error in the value of resistance deduced from the measurement is nearly
• ± 1%
• ± 2.4%
• ± 3.4%
• ± 1.4%

### Question 17

Question
Two meters X and Y require 40 mA and 50 mA, Respectively, to give full-scale Deflection, then
• sensitivity can not be judged with given information
• both are equally sensitive
• X is more sensitive
• Y is more sensitive

### Question 18

Question
Assertion (A) : Precision is a necessary prerequisite of accuracy. Reason (R) : Precision guarantees accuracy.
• A is true but R is false
• A is false bur R is true
• Both A and R are true and R is the correct explanation of A
• Both A and R are true but R is NOT the correct explanation of A

### Question 19

Question
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
• 3 %
• 4 %
• 5 %
• 6 %

### Question 20

Question
Which of the following meter is most suitable for measuring radio frequency currents?
• Moving - coil meter.
• Moving - iron meter.
• Thermocouple meter.
• VTVM.

### Question 21

Question
Schering bridge is used to measure which of the following ?
• Frequency.
• Inductance.
• Capacitance.
• Resistance.

### Question 22

Question
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
• 200 µNm.
• 100 µNm.
• 400 µNm.
• 500 µNm.

### Question 23

Question
Attraction and repulsion type instruments are the two different types of which instrument ?
• Moving iron type.
• Multipliers.
• Dynamo-meter type.
• Induction type.

### Question 24

Question
A PMMC voltmeter is connected across a series combination of a DC voltage source V1 = 2 V and an AC voltage source V2 = 3sin4t, the voltmeters reads
• 2 V
• 5 V
• 2+ 3sin4t
• 0 V

Question
• 20√3.
• 10√3.
• 10.
• 20.

### Question 26

Question
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
• Inclined at 30°.
• Inclined at 60°.
• Parallel.
• Perpendicular.

### Question 27

Question
Kelvines double bridge is used to measure low resistance because
• There is no thermo electric emf.
• It has high sensitivity.
• Effect of contact and lead resistance is eliminated.
• Resistance variation due to temperature.

### Question 28

Question
An electrodynamic meter can be used to measure
• AC volatge.
• DC voltage.
• both AC and DC voltage.
• DC current.

### Question 29

Question
The main advantage of Anderson bridge over Maxwell bridge is that
• reduction of the cost.
• balance equation independent of frequency.
• attaining balance condition is easier.
• measures high Q inductors.

### Question 30

Question
Assertion(A): A low power factor wattmeter has special constructional features to ensure accurate measurment. Reason(R): Extension of wattmeter range in DC circuit can be easily done by using current and potential trnasformer
• A is false R is true.
• A is true R is false.
• Both A and R is true and R is correct explanation of A C.
• Both A and R is true and R is not correct explanation of A.

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