Electrical Measurements & Units Test Questions - Set 14

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 

ANSWER: Circle

Explanation:
No explanation is available for this question!


2)   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 

ANSWER: Non electrical quantity into electrical signal

Explanation:
No explanation is available for this question!


3)   Potentiometer transducers are used for the measurement of

a. Pressure
b. Displacement
c. Both (a) and (b)
d. None of these
Answer  Explanation 

ANSWER: Both (a) and (b)

Explanation:
No explanation is available for this question!


4)   Thermistor is a transducer. Its temperature coefficient is

a. Negative
b. Positive
c. Zero
d. None of these
Answer  Explanation 

ANSWER: Negative

Explanation:
No explanation is available for this question!


5)   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 

ANSWER: Passive device and converts mechanical displacement into a change of resistance

Explanation:
No explanation is available for this question!


6)   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 

ANSWER: Copper and nickel

Explanation:
No explanation is available for this question!


7)   The linear variable differential transformer transducer is

a. Inductive transducer
b. Non-inductive transducer
c. Capacitive transducer
d. Resistive transducer
Answer  Explanation 

ANSWER: Inductive transducer

Explanation:
No explanation is available for this question!


8)   The transducer used for the measurements is/are

a. Resistance temperature detectors
b. Thermistors
c. Ultrasonic
d. All of these
Answer  Explanation 

ANSWER: All of these

Explanation:
No explanation is available for this question!


9)   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 

ANSWER: Thermocouples

Explanation:
No explanation is available for this question!


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

a. Mechanical
b. Electro-mechanical
c. Electronic
d. All of these
Answer  Explanation 

ANSWER: All of these

Explanation:
No explanation is available for this question!


11)   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 

ANSWER: Decreases

Explanation:
No explanation is available for this question!


12)   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 

ANSWER: Four

Explanation:
No explanation is available for this question!


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

a. ± 0.2%
b. ± 0.4%
c. ± 0.1%
d. ± 0.8%
Answer  Explanation 

ANSWER: ± 0.2%

Explanation:
No explanation is available for this question!


14)   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 

ANSWER: All of these

Explanation:
No explanation is available for this question!


15)   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 

ANSWER: Both (a) and (b)

Explanation:
No explanation is available for this question!


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

a. About 1000 bar
b. About 2000 bar
c. About 5000 bar
d. About 7000 bar
Answer  Explanation 

ANSWER: About 7000 bar

Explanation:
No explanation is available for this question!


17)   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 

ANSWER: Very low pressure

Explanation:
No explanation is available for this question!


18)   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 

ANSWER: Monometers

Explanation:
No explanation is available for this question!


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

a. Manganin wire pressure
b. Ionization gauge
c. Dead weight gauge
d. Bourdon tubes
Answer  Explanation 

ANSWER: Manganin wire pressure

Explanation:
No explanation is available for this question!


20)   Advantage of passive instrument is

a. It does not need power supply
b. Cheap
c. Sensitive
d. Accurate
Answer  Explanation 

ANSWER: It does not need power supply

Explanation:
No explanation is available for this question!