“FOR NITKKR ONLY”

“FOR NITKKR ONLY”

A second order instrument is required to measure the input
signals up to 100Mz with an amplitude inaccuracy of less than 1%.
Calculate the natural frequency requirements, if the damping ratios
are 0.3 and 0.6 respectively. Determine the phase shift in each
case at 50 and 75HzQ2 It is proposed to improve the bandwidth of a piezoelectric
accelerometer by increasing the damping by means of a circuit
arrangement. Develop a circuit configuration (passive or active
device) that will perform the required function, and deduce the
side effects of introducing such a system?(b) The temperature of an oven is raised at the rate of 200
degree C per hour. For the condition that the indicating instrument
must not show an error more than 5 degree C, what is the maximum
permissible time constant?(b) Design a simple power factor meter to operate from 230 V
mains. Current range=1 to 10amps; Power factor range: 0.4 to 1?Q6 What is meant by normal mode rejection? An A/D converter has
20ms integration time. What is the normal mode rejection offered by
this ADC for signals having frequency of (i) 150Hz (ii) 145Hz?

 

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