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.Management Sciences
Category: Process Control and Instrumentation
Which of the following shows maximum dip effect (indicating reverse direction of temperature change) ?
A. Mercury thermometer
B. Radiation pyrometer
C. Bimetallic thermometer
D. Thermocouple
For increased speed of response of an expansion pressure spring thermometer, the thermometer bulb should have a__________________?
A. Large area but small mass
B. High thermal conductivity
C. Small specific heat
D. All A , B & C
Bourdon tube is never made of________________?
A. Phosphor bronze
B. Monel metal
C. Stainless steel
D. Cast iron
Bimetal strips are not used in________________?
A. Bimetallic thermometers
B. Thermocouples
C. Thermostats
D. Relays for opening & closing of electrical circuits
For two non-interacting first order systems connected in series, the overall transfer function is the ______________ of the individual transfer functions?
A. Product
B. Ratio
C. Sum
D. Difference
Working principle of mercury in glass thermometer is__________________?
A. Volumetric expansion
B. Pressure rise with temperature
C. Linear expansion
D. None of these
Vapour actuated pressure spring thermometer does not require ambient temperature compensation. Ambient temperature compensation is provided in gas or liquid expansion pressure spring thermometer by__________________?
A. Making the volume of thermometer bulb as large as conveniently possible
B. Reducing the volume of the capillary to a minimum
C. Reducing the volume of the receiving element to a minimum
D. All A , B & C.
Thermocouple is suitable for measuring_________________?
A. Liquid temperatures only
B. Very high temperatures only
C. Very low temperatures only
D. Both high and low temperatures
For a feed back control system to be stable, the _________________?
A. Roots of the characteristic equation should be real
B. Poles of the closed loop transfer function should lie in the left half of the complex plane
C. Bode plots of the corresponding open loop transfer function should monotonically decrease
D. Poles of the closed loop transfer function should lie in the right half of the complex plane
On-off controllers are normally used for________________?
A. Low loads
B. Temperature changes
C. Flow rate changes
D. None of these
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