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Chemical Engineering Mcqs 9594 MCQs [All-Courses]

Chemical Engineering MCQs designed for job test and interview preparation, particularly for fresh graduates, students, and candidates appearing in competitive exams. These multiple-choice questions cover important topics such as the fundamentals of chemical engineering, chemical processes, chemical reactions, process control, and instrumentation, along with other key concepts in the field.

Phase margin is equal to_______________?

A 180° – phase lag

B Phase lag – 180°

C Phase lag + 180°

D Phase lag + 90°

Review Detailed Answer

Correct Answer: 180° – phase lag

Continuous flue gas analyser makes use of paramagnetic properties of some of its constituents, which move towards the strongest part of the magnetic field thus displacing diamagnetic gases. Which of the following gases is diamagnetic ?

A CO2

B O2

C NO

D NO2

Review Detailed Answer

Correct Answer: CO2

A non-linear chemical system is exemplified by a/an_________________?

A Isothermal CSTR

B Mixer

C Non-isothermal CSTR

D None of these

Review Detailed Answer

Correct Answer: Non-isothermal CSTR

All the thermocouples used for temperature measurement use dissimilar metal ________________?

A Strips

B Bars

C Wires

D Beads

Review Detailed Answer

Correct Answer: Wires

Dead zone is the__________________?

A Same as time constant

B Same as transportation lag

C Maximum change in the variable that does not change the reading of the instrument

D None of these

Review Detailed Answer

Correct Answer: Maximum change in the variable that does not change the reading of the instrument

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________________?

A 5π/12

B π/6

C π/12

D π/3

Review Detailed Answer

Correct Answer: 5π/12

The transfer function for a P-D controller is________________?

A Kc(1+ηD s)

B Kc(1 +1/ηD s)

C Kc ηD s

D Kc/ηD s

Review Detailed Answer

Correct Answer: Kc(1+ηD s)

Water is entering a storage tank at a temperature T0 and flow rate Q0 and leaving at a flow rate Q and temperature T. There are negligible heat losses in the tank. The area of cross-section of the tank is A0. The model that describes the dynamic variation of temperature of water in the tank with time is given as________________?

A Q0(T0 – T) = Ac . h (dT/dt)

B Q0T0 – QT = Ac . h (dT/dt)

C Q(T0 – T) = Ac . h (dT/dt)

D Q(T0 – T) = Ac . (dTH/dt)

Review Detailed Answer

Correct Answer: Q0(T0 – T) = Ac . h (dT/dt)

The root locus plot of the roots of the characteristics equation of a closed loop system having the open loop transfer function K (s + 1)/[2 (2s + 1) (3s + 1)] will have a definite number of loci for variation of K from 0 to ∞. The number of loci is_______________?

A 1

B 2

C 3

D 4

Review Detailed Answer

Correct Answer: 3

Which of the following filled system expansion thermometers has the lowest positive temperature measurement capability ?

A Mercury in glass thermometer

B Alcohol in glass thermometer

C Fused metal (Na or K) in steel thermometer

D Nitrogen in steel thermometer

Review Detailed Answer

Correct Answer: Alcohol in glass thermometer

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Chemical Engineering Mcqs 9594 MCQs [All-Courses]

All Topics 9594

All Topics 9594

Phase margin is equal to_______________?

Continuous flue gas analyser makes use of paramagnetic properties of some of its constituents, which move towards the strongest part of the magnetic field thus displacing diamagnetic gases. Which of the following gases is diamagnetic ?

A non-linear chemical system is exemplified by a/an_________________?

All the thermocouples used for temperature measurement use dissimilar metal ________________?

Dead zone is the__________________?

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________________?

The transfer function for a P-D controller is________________?

The root locus plot of the roots of the characteristics equation of a closed loop system having the open loop transfer function K (s + 1)/[2 (2s + 1) (3s + 1)] will have a definite number of loci for variation of K from 0 to ∞. The number of loci is_______________?

Which of the following filled system expansion thermometers has the lowest positive temperature measurement capability ?