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BSNL TTA ONLINE TEST - 4 Instruments and Measurements

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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.
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Quiz by BSNL ACADEMY, updated more than 1 year ago More Less
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Created by BSNL ACADEMY about 6 years ago
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Copied by BSNL ACADEMY about 6 years ago
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Copied by BSNL ACADEMY about 6 years ago
BSNL ACADEMY
Copied by BSNL ACADEMY about 6 years ago
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Resource summary

Question 1

Question
Which one of the following meters has maximum loading effect on the circuit under measurement ?
Answer
  • 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
Answer
  • 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
Answer
  • 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.
Answer
  • 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
Answer
  • 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
Answer
  • 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?
Answer
  • 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
Answer
  • (400 ± 3) A
  • (400 ± 2.24) A
  • (400 ±5) A
  • (400 ± 1) A

Question 9

Question
A first order instrument is characterized by
Answer
  • 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
Answer
  • precision
  • resolution
  • sensitivity
  • repeatability

Question 11

Question
The difference between the indicated value and the true value of a quantity is
Answer
  • 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
Answer
  • 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) ?
Answer
  • 3.9µF
  • 2.4µF
  • 1.5µF
  • 0.9µF

Question 14

Question
Dynamic errors are caused by
Answer
  • 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
Answer
  • 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
Answer
  • ± 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
Answer
  • 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.
Answer
  • 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
Answer
  • 3 %
  • 4 %
  • 5 %
  • 6 %

Question 20

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

Question 21

Question
Schering bridge is used to measure which of the following ?
Answer
  • 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
Answer
  • 200 µNm.
  • 100 µNm.
  • 400 µNm.
  • 500 µNm.

Question 23

Question
Attraction and repulsion type instruments are the two different types of which instrument ?
Answer
  • 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
Answer
  • 2 V
  • 5 V
  • 2+ 3sin4t
  • 0 V

Question 25

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

Question 27

Question
Kelvines double bridge is used to measure low resistance because
Answer
  • 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
Answer
  • 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
Answer
  • 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
Answer
  • 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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