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BARC-2018 EE: Electrical & Electronics Measurement Quiz 1
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Question 1
In a variable reluctance type transducer, the self-inductance of the coil is largest for which of the following values of the length of the air gap?
Question 2
A copper resistance thermometer has a resistance of 10 Ω at 30 °C. What is the maximum temperature that it can measure if the maximum resistance of the thermometer is 16 Ω? The resistance temperature coefficient of copper is 0.00393 Ω/Ω- °C.
Question 3
A translational potentiometer has the resistance wire wound around a card of length 20 mm. If the number of turns is 40 per mm, find the resolution of the potentiometer.
Question 4
A resistance wire strain gauge of soft iron has a resistance of 100 Ω. When it is subjected to a strain, the length of the wire changed from 45 cm to 47.4 cm. Neglecting the piezo-resistive effect, determine the resistance of the wire after being strained. Poisson’s ratio of soft iron is 1.6.
Question 5
A Maxwell’s capacitance bridge is used to measure an unknown inductance has following data –
R1= 100 Ω, R2 = 200 Ω, R3= 400 Ω, R4= 1000 Ω and C4= 2 µF
Then calculate the value of Q factor of coil if frequency is 500 Hz.
R1= 100 Ω, R2 = 200 Ω, R3= 400 Ω, R4= 1000 Ω and C4= 2 µF
Then calculate the value of Q factor of coil if frequency is 500 Hz.
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