The pressure sensing element of elastic type pressure gauge is never made in the form of a_________________?

A. Proportional controller
B. Proportional-derivative (PD) controller
C. Proportional-integral (PI) controller
D. Proportional integral-derivative (PID) controller

A. Specially designed thermocouple
B. Optical pyrometer
C. Radiation pyrometer
D. None of these

A. Gaseous mixture
B. Miscible liquids
C. Solids
D. Isotopes

A. 120°
B. 30°
C. 180°
D. 90°

A. A.R. vs. phase lag of first order
B. A.R. vs. phase lag of second order
C. Closed loop values vs. open loop values
D. Frequency response values of controllers

A. Mercury in glass
B. Bimetallic
C. Vapor pressure
D. Resistance