# Electrical Measurements & Units Test Questions - 8

1)   If the two input waveforms of equal amplitude and 90 degree phase difference are applied to the CRO then the Lissajous patterns obtained will be

a. Straight line tilted at 45 degree with respect to X-axis
b. Circle
c. Ellipse
d. Vertical straight line
 Answer  Explanation  Related Ques ANSWER: Circle Explanation: No explanation is available for this question!

2) The phase difference between two waveforms in the above figure is given by

a. ∅ = sin-1 Y1/Y2
b. ∅ = sin-1 Y2/Y1
c. ∅ = tan-1 Y2/Y1
d. ∅ = tan-1 Y1/Y2
 Answer  Explanation  Related Ques ANSWER: ∅ = sin-1 Y1/Y2 Explanation: No explanation is available for this question!

3)   Function of transducer is to convert

a. Electrical signal into non electrical quantity
b. Non electrical quantity into electrical signal
c. Electrical signal into mechanical quantity
d. All of these
 Answer  Explanation  Related Ques ANSWER: Non electrical quantity into electrical signal Explanation: No explanation is available for this question!

4)   Potentiometer transducers are used for the measurement of

a. Pressure
b. Displacement
c. Both (a) and (b)
d. None of these
 Answer  Explanation  Related Ques ANSWER: Both (a) and (b) Explanation: No explanation is available for this question!

5)   Thermistor is a transducer. Its temperature coefficient is

a. Negative
b. Positive
c. Zero
d. None of these
 Answer  Explanation  Related Ques ANSWER: Negative Explanation: No explanation is available for this question!

6)   Strain gauge is a

a. Active device and converts mechanical displacement into a change of resistance
b. Passive device and converts electrical displacement into a change of resistance
c. Passive device and converts mechanical displacement into a change of resistance
d. Active device and converts electrical displacement into a change of resistance
 Answer  Explanation  Related Ques ANSWER: Passive device and converts mechanical displacement into a change of resistance Explanation: No explanation is available for this question!

7)   Constantan is used for measurement of dynamic strains. It is an alloy of

a. Copper and Aluminium
b. Nickel and molybdenum
c. Nickel and chromium
d. Copper and nickel
 Answer  Explanation  Related Ques ANSWER: Copper and nickel Explanation: No explanation is available for this question!

8)   The linear variable differential transformer transducer is

a. Inductive transducer
b. Non-inductive transducer
c. Capacitive transducer
d. Resistive transducer
 Answer  Explanation  Related Ques ANSWER: Inductive transducer Explanation: No explanation is available for this question!

9)   The transducer used for the measurements is/are

a. Resistance temperature detectors
b. Thermistors
c. Ultrasonic
d. All of these
 Answer  Explanation  Related Ques ANSWER: All of these Explanation: No explanation is available for this question!

10)   If at one end, the two wires made of different metals are joined together then a voltage will get produced between the two wires due to difference of temp between the two ends of wires. This effect is observed in

a. Thermocouples
b. Thermistors
c. RTD
d. Ultrasonics
 Answer  Explanation  Related Ques ANSWER: Thermocouples Explanation: No explanation is available for this question!

11)   For the measurement of pressure the instruments used can be

a. Mechanical
b. Electro-mechanical
c. Electronic
d. All of these
 Answer  Explanation  Related Ques ANSWER: All of these Explanation: No explanation is available for this question!

12)   With the increase in the intensity of light, the resistance of a photovoltaic cell

a. Increases
b. Decreases
c. Remains same
d. None of these
 Answer  Explanation  Related Ques ANSWER: Decreases Explanation: No explanation is available for this question!

13)   If the displacement is measured with strain gauge then the number of strain gauge normally required are

a. One
b. Two
c. Three
d. Four
 Answer  Explanation  Related Ques ANSWER: Four Explanation: No explanation is available for this question!

14)   A capacitive pressure sensor has a typical measurement uncertainty of

a. ± 0.2%
b. ± 0.4%
c. ± 0.1%
d. ± 0.8%
 Answer  Explanation  Related Ques ANSWER: ± 0.2% Explanation: No explanation is available for this question!

15)   The instruments used for the measurement of pressure is / are

a. Bellows
b. Diaphragms
c. Fiber optic pressure sensors
d. All of these
 Answer  Explanation  Related Ques ANSWER: All of these Explanation: No explanation is available for this question!

16)   Bourdon tube is used for the measurement of gauge pressure of

a. Gas
b. Liquid fluid
c. Both (a) and (b)
d. None of these
 Answer  Explanation  Related Ques ANSWER: Both (a) and (b) Explanation: No explanation is available for this question!

17)   Dead weight gauge is used for the measurement of pressure of

18)   The ionization gauge an instrument used for the measurement of

a. Very low pressure
b. Medium pressure
c. High pressure
d. Very high pressure
 Answer  Explanation  Related Ques ANSWER: Very low pressure Explanation: No explanation is available for this question!

19)   When visual indication of pressure level is required then the instrument generally used is

a. Monometers
b. Diaphragm sensors
c. Bourdon tube
d. Resonant wire device
 Answer  Explanation  Related Ques ANSWER: Monometers Explanation: No explanation is available for this question!

20)   For the measurement of high pressure with high accuracy the device used is

a. Manganin wire pressure
b. Ionization gauge
d. Bourdon tubes
 Answer  Explanation  Related Ques ANSWER: Manganin wire pressure Explanation: No explanation is available for this question!

21)   Advantage of passive instrument is

a. It does not need power supply
b. Cheap
c. Sensitive
d. Accurate
 Answer  Explanation  Related Ques ANSWER: It does not need power supply Explanation: No explanation is available for this question!

22)   In McLeod gauge,

a. High pressure fluid is expanded to a low pressure which is read by the monometer technique
b. Low pressure fluid is compressed to a high pressure which is read by the bourdon technique
c. High pressure fluid is expanded to a low pressure which is read by the bourdon technique
d. Low pressure fluid is compressed to a high pressure which is read by the monometer technique
 Answer  Explanation  Related Ques ANSWER: Low pressure fluid is compressed to a high pressure which is read by the monometer technique Explanation: No explanation is available for this question!

23)   The rate at which fluid flows through a closed pipe can be determined by

a. Determining the mass flow rate
b. Determining the volume flow rate
c. Either (a) or (b)
d. None of these
 Answer  Explanation  Related Ques ANSWER: Either (a) or (b) Explanation: No explanation is available for this question!

24)   Conveyor-based method is used for the measurement of the flow of

a. Solids
b. Liquid
c. Gas
d. All of these
 Answer  Explanation  Related Ques ANSWER: Solids Explanation: No explanation is available for this question!

25)   For the measurement of flow rate of liquid, the method used is

a. Conveyor-based methods
b. Bourdon tube
c. Coriolis method
d. Thermal mass flow measurement
 Answer  Explanation  Related Ques ANSWER: Coriolis method Explanation: No explanation is available for this question!

26)   The devices used for flow obstruction is/are

a. Orifice plate
b. Venturi tube
c. Flow nozzle and dall flow tube
d. All of these
 Answer  Explanation  Related Ques ANSWER: All of these Explanation: No explanation is available for this question!

27)   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!

28)   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!

29)   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!

30)   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!