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.Management Sciences
Category: Process Control and Instrumentation
Which of the following is never used as an element of industrial resistance thermometer ?
0
A. Lead
B. Nickel
C. Copper
D. 30% iron + 70% nickel
The characteristic equation for the control system with a closed loop transfer function G1/1 + G2 is given by 1 + G2 = 0. The characteristic equation for the control system_________________?
A. Depends only upon the open loop transfer function
B. Determines its stability
C. Is the same for set point or load changes
D. All A , B & C.
With increase in temperature, the electrical conductivity of the platinum used in the resistance thermometer ?
A. Increases
B. Decreases
C. Remain constant
D. Increases exponentially
Which of the following is not suitable for measuring the temperature of a red hot object in the range of 800 – 1600°C ?
A. Optical pyrometer
B. Radiation pyrometer
C. Photoelectric pyrometer
D. Thermocouples
A system with transfer function [(2S/4S) + 1] is of _____________ order?
A. Zero
B. 1st
C. 2nd
D. 3rd
Out of the following thermocouple wire insulating material, the highest temperature rating is for________________?
A. Teflon
B. Ceramic fibre
C. Asbestos
D. Fibre glass
Mcleod gauge is used to measure the __________________?
A. Point velocity
B. Flow rate
C. Vacuum
D. Pressure
Routh stability method uses ______________ loop transfer function?
A. Open
B. Closed
C. Either A. or B.
D. Neither A. nor B.
Liquid flow rate in a small channel is best measured by a/an____________________?
A. Weir
B. Pitot tube
C. Vane meter
D. Venturimeter
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