Chemical Engineering Archives

Chemical Engineering

Prepare with the best Chemical Engineering MCQs with answers and detailed explanations for exams and job tests. Our collection covers key topics such as chemical process calculations, thermodynamics, fluid mechanics, heat transfer, mass transfer, reaction engineering, instrumentation, and plant design. These Chemical Engineering multiple-choice questions are ideal for students, competitive exam aspirants, and professionals preparing for NTS, PPSC, FPSC, PEC exams, GATE, university entry tests, and job interviews. Practice online with updated Chemical Engineering MCQs to strengthen your concepts and improve technical problem-solving skills.

1191. The capital & running costs of similar machines having unequal service life can be compared by the __________ method.

A. Equivalant annual cost

B. Rate of return

C. Present net worth

D. Capitalised cost

✅ The correct answer is option D.

1192. The cost of providing service in a queing system decreases with the

A. Increased mean time in the queue

B. Increased arrival rate

C. Decreased mean time in the queue

D. Decreased arrival rate

✅ The correct answer is option A.

1193. On being hit with a hammer, __________ will readily fracture.

A. Brass

B. Mild steel

C. Cast iron

D. Lead

✅ The correct answer is option C.

1194. Floating control action

A. Moves the final control element at constant speed in either direction in response to an error signal

B. Changes the position of the final control element from on to off

C. Is used to counteract rapid load changes

D. None of these

✅ The correct answer is option A.

1195. Out of the following __________ iron has the best capability to bear sudden & excessive shocks.

A. White

B. Cast

C. Wrought

D. Pig

✅ The correct answer is option C.

1196. The expected efficiency of a single rivetted lap joint is of the order of 50%. If the thickness of the plate is increased four times, then the rivet diameter will have to be increased __________ times.

A. Two

B. Four

C. Six

D. Eight

✅ The correct answer is option A.

1197. Air/fuel ratio on molar (volume) basis for combustion of methane with theoretical quantity of air with be

A. 9.5:1

B. 12.5:1

C. 15.5 :1

D. 18.5 : 1

✅ The correct answer is option A.

1198. Common salt is produced from sea water in India generally by the __________ method.

A. Freeze drying

B. Solar evaporation

C. Electrolytic

D. None of these

✅ The correct answer is option B.

1199. As the fluid flow rate increases, the float of the rotameter

A. Rises in the tube

B. Rotates at higher speed

C. Rotates at lower speed

D. Drops down in the tube

✅ The correct answer is option A.

1200. The leg of a barometric leg pump is longer than the Toricellian leg, which is about __________ metres.

A. 1

B. 5

C. 34

D. 10

✅ The correct answer is option D.