All the thermocouples used for temperature measurement use dissimilar metal stri

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Question
All the thermocouples used for temperature measurement use dissimilar metal
Options
A. strips
B. bars
C. wires
D. beads

Correct Answer

wires

Process Control and Instrumentation problems

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4. Working principle of mercury in glass thermometer is based on volumetric expansion of mercury with increase in temperature. Which of the following undergoes minimum volumetric expansion for a given temperature change?
Options
A. Water
B. Mercury
C. Methyl alcohal
D. Carbon-tetrachloride

5. Which of the following does not figure in the list of seven substances selected for international temperature scale?
Options
A. Ice (F.P) and steam (B.P)
B. Oxygen and sulphur (B.P)
C. Antimony and silver (F.P)
D. Zinc (B.P) and mercury (F.P)

6. The time constant of a unity gain, first order plus time delay process is 5 min. If the phase lag at a frequency of 0.2 rad/min is 60�, then the dead time (in minutes) is
Options
A. 5?/12
B. ?/6
C. ?/12
D. ?/3

7. In a second order under damped system, the
Options
A. time required for the response of first reach its ultimate value is called the response time.
B. overshoot (which is a measure of how much the response exceeds the ultimate value) increase with the decrease of damping co-efficient e.
C. decay ratio (which is the ratio of the sizes of successive peaks) is equal to the reciprocal of overshoot.
D. characteristics of a step response is represented by

9. The offset introduced by proportional controller with gain K_cin response of first order system can be reduced by
Options
A. reducing value of K_c.
B. introducing integral control.
C. introducing derivative control.
D. none of the above.

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