Process Control and Instrumentation Questions

• Dilute wine was used as a thermometric liquid initially to develop temperature scale. First emperical temperature scale developed was the __________ scale.
• The function of a transducer is to
• The temperature of tempering oil baths maintained at 400°C during heat treatment of steel is measured by a/an __________ thermocouple.
• Which of the following relates the absorption & evolution of heat at the junctions of a thermocouple to the current flow in the circuit?
• Which of the following is not the triple point of water?
• Which of the following is an undesirable dynamic characteristic of an instrument?
• Which of the following thermocouples will give the highest output for the same value of hot and cold junction temperature?
• Which of the following controllers has the least maximum deviation?
• Which of the following relates the emf. generated in a single homogeneous wire to the temperature difference?
• Thermistor, which has high temperature co-efficient of resistivity, is used as the sensing element in resistance thermometer. It is a/an
• Which of the following is a desirable characteristic of an instrument?
• Zirconia probe is used for the continuous measurment of __________ flue gases going out of the furnace.
• Emf developed by a thermocouple, while measuring a temperature of 600°C is about 5.5 mV. The type of thermocouple used is
• Instrumentation in a plant offers the advantage of
• A proportional controller with a gain of Kc is used to control a first order process. The offset will increase, if
• A negative gain margin expressed in decibels means a/an __________ system.
• Which of the following measurements can be made by the measurement of emf?
• Smoke density of the flue gas going out of the chimney is measured by a
• The transfer function for a PID controller is (where, τ i is the integral (reset) time and τD is the derivative time.)
• The __________ of a vapor pressure thermometer is a secondary element.