# Electrical and Electronics Measurement & Instrumentation Test - Set - 2

1)   Accuracy of a measuring instrument indicates the

a. Closeness of the output reading to the true value
b. Ratio of output value to the input value
c. Change in output with each change in input
d. Degree of freedom from random errors
 Answer  Explanation  Related Ques ANSWER: Closeness of the output reading to the true value Explanation: No explanation is available for this question!

2)   If a pressure gauge of range 0 - 10 bar has a quoted inaccuracy of ±1.0 % of full scale reading, then it means

a. Minimum expected error in any reading is 0.1 bar
b. Maximum expected error in any reading is 0.1 bar
c. Maximum expected error in any reading is 1 bar
d. Minimum expected error in any reading is 1 bar
 Answer  Explanation  Related Ques ANSWER: Maximum expected error in any reading is 0.1 bar Explanation: No explanation is available for this question!

3)   An instrument with a range of 0 -10 bar is used for measuring pressure. If the expected value of reading is between 0 and 1 bar then the instrument will give

a. More accurate readings than the instrument with range of 0 - 5 bar
b. Less accurate readings than the instrument with range of 0 - 5 bar
c. Accuracy of reading will be same for both the instruments with range of 0 - 10 bar and 0 - 5 bar
d. None of these
 Answer  Explanation  Related Ques ANSWER: Less accurate readings than the instrument with range of 0 - 5 bar Explanation: No explanation is available for this question!

4)   A voltmeter connected across a resistor gives a value of 65 V but the expected value of resistor was 68 V. Then the absolute error and the relative accuracy of the measurement will be

a. 3.2%, 96.8%
b. 3.8%, 96.2%
c. 4%, 96%
d. 4.4%, 95.59%
 Answer  Explanation  Related Ques ANSWER: 4.4%, 95.59% Explanation: No explanation is available for this question!

5)   Precision of an instrument is defined as

a. Closeness of output to the true value
b. Change in output for every change in input
c. Degree of freedom from random errors
d. Both (a) and (b)
 Answer  Explanation  Related Ques ANSWER: Degree of freedom from random errors Explanation: No explanation is available for this question!

6)   An instrument with high precision implies

a. High accuracy
b. Low accuracy
c. Does not imply anything about measurement accuracy
d. None of these
 Answer  Explanation  Related Ques ANSWER: Does not imply anything about measurement accuracy Explanation: No explanation is available for this question!

7)   Low accuracy measurements from a high precision instrument are normally caused by

a. Bias in the measurement
b. Human errors
c. Instrumental defect
d. Low temperature
 Answer  Explanation  Related Ques ANSWER: Bias in the measurement Explanation: No explanation is available for this question!

8)   Choose the correct option.

I. Repeatability means the closeness of output readings when the same input is applied repetitively over a short period of time, with the same measurement conditions and same instruments.

II. Reproducibility means the closeness of output readings for the same input when there are changes in the method of measurement and conditions of measurement

a. Both I and II are correct
b. Only I is correct
c. Only II is correct
d. Both are incorrect
 Answer  Explanation  Related Ques ANSWER: Both I and II are correct Explanation: No explanation is available for this question!

9)   Integrating instruments is the subdivision of the secondary instruments. The example for integrating instruments is

a. Ampere - hour meters
b. Watt - hour meters
c. Wattmeters
d. Ampere - hour and watt - hour meters
 Answer  Explanation  Related Ques ANSWER: Ampere - hour and watt - hour meters Explanation: No explanation is available for this question!

10)   The moving system in the indicating instruments is subjected to

a. Deflecting torque
b. Controlling torque
c. Damping torque
d. All the above
e. None of the above
 Answer  Explanation  Related Ques ANSWER: All the above Explanation: No explanation is available for this question!

11)   A spring controlled moving iron voltmeter with full scale deflection of 150 V draws a current of 2 mA. What will be the meter reading if it draws a current of 1 mA?

a. 25.5 V
b. 27.5 V
c. 35.5 V
d. 37.5 V
 Answer  Explanation  Related Ques ANSWER: 37.5 V Explanation: No explanation is available for this question!

12)   A repulsion type moving iron instrument when used with AC circuits, the deflecting torque is

a. Directly proportional to the rms current
b. Directly proportional to the square of rms current
c. Directly proportional to the peak current
d. Directly proportional to the square of the peak current
 Answer  Explanation  Related Ques ANSWER: Directly proportional to the square of rms current Explanation: No explanation is available for this question!

13)   What will a moving iron ammeter read if a rectangular waveform current with peak value of 120 mA is passed through it?

a. 120 mA
b. 84.8 mA
c. 169.7 mA
d. 60 mA
 Answer  Explanation  Related Ques ANSWER: 120 mA Explanation: No explanation is available for this question!

14)   A moving iron instrument is used as an ammeter. Its range can be extended by using

a. Suitable shunt across its terminal
b. A high non - inductive resistance
c. Either (a) or (b)
d. Neither (a) nor (b)
 Answer  Explanation  Related Ques ANSWER: Suitable shunt across its terminal Explanation: No explanation is available for this question!

15)   For a moving iron ammeter, the change of inductance is 3 μ H / degree and its spring constant is 4 X10 -7 N – m / degree. If the maximum deflection of the pointer is 90 degree, then the corresponding current in the coil be

a. 3.89 A
b. 4.05 A
c. 4.89 A
d. 5 A
 Answer  Explanation  Related Ques ANSWER: 4.89 A Explanation: No explanation is available for this question!

16)   For extending the range of 0 - 150 V to 0 - 500 V in a 10000 Ω  / V meter, the value of series resistance required is equal to

a. 3 M Ω
b. 3.5 M Ω
c. 4 M Ω
d. 4.5 M Ω
 Answer  Explanation  Related Ques ANSWER: 3.5 M Ω Explanation: No explanation is available for this question!

17)   A current of 2 + 3sinωt A is passed through a moving iron instrument and through a meter respectively. The readings of the two meters are

a. 2 A, 2 A
b. 2 A, 2.9 A
c. 2.9 A, 2.9 A
d. 2.9 A, 2 A
 Answer  Explanation  Related Ques ANSWER: 2.9 A, 2 A Explanation: No explanation is available for this question!

18)   In a permanent magnet moving coil instrument, the deflecting torque is

a. Directly proportional to both number of turns and flux density
b. Directly proportional to the number of turns and inversely proportional to the flux density
c. Inversely proportional to the number of turns and directly proportional to the flux density
d. Inversely proportional to both number of turns and flux density
 Answer  Explanation  Related Ques ANSWER: Directly proportional to both number of turns and flux density Explanation: No explanation is available for this question!

19)   The accuracy in a bridge measurement depends on

a. Sensitivity of detector
b. Applied voltage
c. Accuracy of indicator
d. Both (a) and (b)
 Answer  Explanation  Related Ques ANSWER: Both (a) and (b) Explanation: No explanation is available for this question!

20)   The high resistances are found in

a. Insulation resistance of cables and wires
b. Resistance of shunt field winding and the multipliers
c. Resistance of armature windings of electrical machine
d. Resistance of series field winding of a dc machine
 Answer  Explanation  Related Ques ANSWER: Insulation resistance of cables and wires Explanation: No explanation is available for this question!

21)   A null type of bridge with DC excitation is commonly known as

a. Wheatstone bridge
b. Anderson bridge
c. Wien bridge
d. Schering bridge
 Answer  Explanation  Related Ques ANSWER: Wheatstone bridge Explanation: No explanation is available for this question!

22)   The vibration galvanometer used as detector, it responds

a. Only to the fundamental frequency
b. Only to the harmonics frequency
c. Both (a) and (b)
d. Does not respond to any frequency
 Answer  Explanation  Related Ques ANSWER: Only to the fundamental frequency Explanation: No explanation is available for this question!

23)   The AC Bridge used for the measurement of inductance is / are

a. Maxwell’s inductance bridge
b. Hay’s bridge
c. Anderson’s bridge, Owen’s bridge
d. All of these
e. None of these
 Answer  Explanation  Related Ques ANSWER: All of these Explanation: No explanation is available for this question!

24)   Under balanced condition, the current flowing through the detector is equal to

a. 1 A
b. 0 A
c. Sum of the currents flowing in the adjacent arms
d. Difference between the current flowing in the adjacent arms
 Answer  Explanation  Related Ques ANSWER: 0 A Explanation: No explanation is available for this question!

25)   The dynamometer wattmeters are

a. More accurate on DC supply
b. More accurate on AC supply
c. Equally accurate on both AC and DC supply
d. None of these
 Answer  Explanation  Related Ques ANSWER: Equally accurate on both AC and DC supply Explanation: No explanation is available for this question!

26)   Due to the inductance in the pressure coil of dynamometer type wattmeter, the reading will be

a. High for both leading and lagging power factors
b. Low for both leading and lagging power factors
c. High for lagging power factor and low for leading power factor
d. Low for lagging power factor and high for leading power factor
 Answer  Explanation  Related Ques ANSWER: High for lagging power factor and low for leading power factor Explanation: No explanation is available for this question!

27)   What will happen if the current coil & potential coil of dynamometer type wattmeter is interchanged?

a. Potential coil will get damaged
b. Current coil will get damaged
c. Both current coil and potential coil will get damaged
d. Neither potential coil nor current coil will get damaged
 Answer  Explanation  Related Ques ANSWER: Current coil will get damaged Explanation: No explanation is available for this question!

28)   In some wattmeters, a small capacitor is connected in parallel with the series resistor for

a. Reducing error due to inductance of the series resistor
b. Obtaining non inductive voltage coil current
c. Making resultant reactance capacitive
d. All of these
e. None of these
 Answer  Explanation  Related Ques ANSWER: All of these Explanation: No explanation is available for this question!

29)   An electrolytic ampere hour meter can be converted into watt - hour meter by

a. Multiplying them by the voltage of the circuits in which it is used
b. Multiplying them by the current of the circuits in which it is used
c. Multiplying them by the power of the circuits in which it is used
d. Cannot be converted
 Answer  Explanation  Related Ques ANSWER: Multiplying them by the voltage of the circuits in which it is used Explanation: No explanation is available for this question!

30)   Commutator type meters can be used for

a. AC supply
b. DC supply
c. Both AC and DC supply
d. None of these
 Answer  Explanation  Related Ques ANSWER: Both AC and DC supply Explanation: No explanation is available for this question!

31)   Which part is called as heart of CRO?

a. CRT
b. Sweep generator
c. Trigger circuit
d. Amplifier
 Answer  Explanation  Related Ques ANSWER: CRT Explanation: No explanation is available for this question!

32)   The light emitted by the zinc silicate coated fluorescent screen of cathode ray tube is usually of

a. Green colour
b. Yellow colour
c. Blue colour
d. White colour
 Answer  Explanation  Related Ques ANSWER: Green colour Explanation: No explanation is available for this question!

33)   If the bombardment of electrons ceases i.e. when the signal becomes zero then the light emitted by the screen will

a. Disappear immediately
b. Persist for some time then it will disappear
c. Will not disappear at all
d. None of these
 Answer  Explanation  Related Ques ANSWER: Persist for some time then it will disappear Explanation: No explanation is available for this question!

34)   The device which is used for making temporary measurements of flow is

a. Venturi
b. Dull flow tube
c. Orifice plate
d. Pitot static tube
 Answer  Explanation  Related Ques ANSWER: Orifice plate Explanation: No explanation is available for this question!

35)   For the measurement of flow the cheapest device is

a. Venturi
b. Dall flow tube
c. Flow nozzle
d. Pitot static tube
 Answer  Explanation  Related Ques ANSWER: Flow nozzle Explanation: No explanation is available for this question!

36)   The instrument which is not suitable for the application in automatic control scheme

a. Rotameters
b. Pitot static tube
c. Rotary piston meter
d. Orifice plate
 Answer  Explanation  Related Ques ANSWER: Rotameters Explanation: No explanation is available for this question!

37)   Example for positive displacement meter is

a. Variable area flow meter
b. Turbine meters
c. Rotary piston meter
d. Venturi
 Answer  Explanation  Related Ques ANSWER: Rotary piston meter Explanation: No explanation is available for this question!

38)   In electronic voltmeter, the range of input voltages can be extended by using

a. Functional switch
b. Input attenuator
c. Rectifier
d. Balanced bridge dc amplifier
 Answer  Explanation  Related Ques ANSWER: Input attenuator Explanation: No explanation is available for this question!

39)   The measurement range of digital voltmeter is

a. ± 1V to ± 1MV
b. ± 1V to ± 1kV
c. ± 1kV to ± 1MV
d. ± 100 kV to ± 100MV
 Answer  Explanation  Related Ques ANSWER: ± 1V to ± 1MV Explanation: No explanation is available for this question!

40)   Which among the following is not a type of digital voltmeters?

a. Ramp type
b. Integrating
c. Potentiometric type
d. None of these
 Answer  Explanation  Related Ques ANSWER: None of these Explanation: No explanation is available for this question!