Chemical Engineering Mcqs

Which of the following is not classified as a thermo electric pyrometer ?

(A) Resistance thermometer
(B) Thermocouple
(C) Optical pyrometer (disappearing filament type)
(D) Radiation pyrometer

Submitted By :Ali Uppal

If response of a control system is to be free of offset and oscillation, the most suitable controller is_________________?

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

Submitted By :Ali Uppal

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

Submitted By :Ali Uppal

Which of the following thermocouples is capable of measuring a temperature of -50°C ?

(A) Platinum-platinum + rhodium
(B) Chromel-Alumel
(C) Iron-constantan
(D) Copper-constantan

Submitted By :Ali Uppal

Reference points i.e., ice point and steam point in Reaumer temperature scale are respectively_________________?

(A) – 273° & 80°
(B) 0° & 80°
(C) 32° & 460°
(D) 32° & 80°

Submitted By :Ali Uppal

Ordinary mercury in glass thermometer is used for measuring temperature upto 120°C. However, for measuring higher temperature upto __________ °C, thermometer is made by filling nitrogen under pressure above the mercury, which stops the evaporation of mercury and reduces the chance of broken thread of mercury?

(A) 250
(B) 350
(C) 550
(D) 700

Submitted By :Ali Uppal

Pyrometry refers to the measurement of temperature_________________?

(A) With the mercurial thermometer upto 350°C
(B) Directly
(C) Which is of higher magnitude
(D) All

Submitted By :Ali Uppal

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

Submitted By :Ali Uppal

Water is flowing through a series of four tanks and getting heated as shown in figure. It is desired to design a cascade control scheme for controlling the temperature of water leaving the tank 4 as there is a disturbance in the temperature of a second stream entering the tank 2. Select the best place to take the secondary measurement for the second loop?

(A) Tank 1
(B) Tank 2
(C) Tank 3
(D) Tank 4

Submitted By :Ali Uppal

A first order system with unity gain and time constant η is subjected to a sinusoidal input of frequency w = 1/η. The amplitude ratio for this system is______________?

(A) 1
(B) 0.5
(C) 1/√2
(D) 0.25

Submitted By :Ali Uppal

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