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For the following questions answer them individually
The thermal time constant is the time
To reach the final steady temperature if the initial rate of increase of temperature were maintained constant
To reach 63% of final steady temperature
To reach 66.66% of final steady temperature
To reach half of the final steady temperature
Which of the following circuit will have no transients?
Pure resistive circuit
L-C Circuit
R-L-C Circuit
R-L Circuit
A conductor of length 100 cm moves right angles to a magnetic field of flux density of 2 wb/sq.m. with the velocity of 25 m/second. The induced emf in the conductor will be
25 volts
50 volts
75 volts
100 volts
Which of the following devices are required to measure three phase balanced power?
One watt meter
One watt meter and one voltage transformer of 1 : 1 ratio
One watt meter and two voltmeters
None of the above
The sensitivity of an instrument is
The smallest increment in the input that can be detected with certainty
The largest input change to which the instrument fails to respond
Ratio of the change in the magnitude of the output to the corresponding change in the magnitude of the input
Closeness of the output values for repeated application of a constant input
Potentiometer sensitivity can be increased by
Decreasing current in the potentiometer wire
Increasing the length of the potentiometer wire
Decreasing the length of the potentiometer wire
Replacing the cell by a regulated power supply
Low resistance is measured with
De Sauty’s bridge
Maxwell’s bridge
Kelvin’s double bridge
Wien bridge
Which bridge is used to determine frequency?
Anderson bridge
De Sautys bridge
Campell’s bridge
The core of a moving iron instrument is made up of permalloy to
Increase sensitivity
Reduce temperature effect
Reduce effect of stray magnetic field
Reduce the size of the instrument
Accuracy is defined as
The measure of consistency of the readings
Closeness with which an instrument reading approaches the true value of the quantity being measured
The smallest measurable input change
The ratio of the input to output
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