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.Management Sciences
Category: Process Control and Instrumentation
Which of the following cannot measure a temperature of 1600°C ?
A. Platinum resistance thermometer
B. Thermocouple
C. Photo-electric pyrometer
D. Radiation pyrometer
What is the ratio of output amplitude to input amplitude for a sinusoidal forcing function in a first order system ?
A. 1
B. > 1
C. < 1
D. None of these
An ideal PID controller has the transfer function [1 + (1/0.55) + 0.25]. The frequency at which the magnitude ratio of the controller is 1, is________________?
A. 0.5/0.2
B. 0.2/0.5
C. 0.2 × 0.5
D. 1/√(0.2 × 0.5)
Process degree of freedom indicates _______________ number of controllers to be used?
A. The maximum
B. The minimum
C. Both maximum and the minimum
D. Nothing about the
Sub-zero temperature (< 0°C) can be measured by a constant volume gas thermometer employing ?
A. Helium
B. Nitrogen
C. Hydrogen
D. None of these
Flow rate measurement of hostile acids and alkalis can be most suitably done by a/an ________________?
A. Venturimeter
B. Orificemeter
C. Magnetic flow meter
D. Hot wire anemometer
Load cells are used for the measurement of __________________?
A. Stress
B. Weight
C. Strain
D. Velocity
All the thermocouples used for temperature measurement use dissimilar metal ________________?
A. Strips
B. Bars
C. Wires
D. Beads
Select the correct statement from the following?
A. The frequency response of a pure capacity process is unbounded
B. The phase lag of a pure time delay system decreases with increasing frequency
C. The amplitude ratio of a pure capacity process is inversely proportional to frequency
D. The amplitude ratio of a pure time delay system increases with frequency
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