chemical engineering chemical engineering basics MCQs – Page 20

Practise multiple-choice questions from chemical engineering chemical engineering basics for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering chemical engineering basics Mcqs

381. If Reynolds number is greater than 1, then the_____________________?
0

A. Inertia force is larger than the surface tension force

B. Inertia force is larger than the gravitational force

C. Viscous force is larger than the inertia force

D. Inertia force is larger than the viscous force

382. Which of the following heat treatment processes is usually applied to castings ?
0

A. Carburising

B. Tempering

C. Annealing

D. Normalising

383. Use of economiser in a boiler plant reduces the fuel consumption for steam generation by about _______________ percent ?
0

A. 50

B. 10

C. 30

D. 1

384. The excess air required for the combustion of pulverized coal is of the order of about _______________ percent ?
0

A. 30

B. 5

C. 15

D. 45

385. Brittleness induced due to the presence of sulphur in steel can be reduced by adding______________?
0

A. Magnesium

B. Vanadium

C. Copper

D. Manganese

386. Softening of hardened steel is done by its____________________?
0

A. Carburising

B. Tempering

C. Annealing

D. Normalising

387. Non-ferrous alloys used for making cutting tools need not have high__________________?
0

A. Abrasion resistance

B. Toughness

C. Red hardness

D. Cutting speed

388. Which of the following mainly decides the current to be employed is arc welding ?
0

A. Electrode size

B. Welded portion length

C. Plate thickness

D. Voltage across the arc

389. While the bin cards are used in the effective stores management, the queuing theory is associated with the _______________ time ?
0

A. Idle

B. Tool replacement

C. Inspection

D. Waiting

390. Which of the following fastening devices has a head at one end and a nut fitted to the other ?
0

A. None of these

B. Top bolt

C. Stud

D. Bolt

391. Moist climate is the most favourable factor in the site selection far a_________________?
0

A. Coke oven battery

B. Textile factory

C. Steel plant

D. Petroleum refinery

392. The refractory brick which has good thermal shock resistance at high temperature but cracks on cooling below 400C is__________________?
0

A. Fireclay

B. Chrome

C. Silica

D. Magnesite

393. The maximum thickness of the metal which can be welded using ultrasonic welding is _____________ mm ?
0

A. 25

B. 3

C. 10

D. 0.5

394. Diamagnetic materials___________________?
0

A. Are magnetised in direction opposite to the magnetic field

B. Are non-magnetic and cannot be magnetised

C. Are magnetised by eddy currents only

D. Can be magnetised in one direction only

395. Absolute zero pressure can be attained at a temperature of___________________?
0

A. 0C

B. 0R

C. None of these

D. 50K

396. Transformer cores are normally made from ______________________?
0

A. Al-Ni-Co alloy

B. High purity iron

C. Grain oriented Fe-Si alloy

D. Soft ferrites

397. Cold cracking in the heat affected zone of a high strength steel weld can take place because of the___________________?
0

A. Martensite formation

B. Sufficient hydrogen present in the welding arc

C. Retained austenite

D. Relatively high sulphur content in the base metal

398. Recrystallisation temperature of steel is ______________________ C?
0

A. 50

B. 300

C. 500

D. 800

399. Which of the following commonly used condenser tube materials has the lowest thermal conductivity ?
0

A. Aluminium brass

B. Titanium

C. Admiralty brass

D. Stainless steel

400. Stainless steel is welded using__________________?
0

A. Oxy-hydrogen flame

B. Inert gas arc welding

C. Arc welding

D. Oxy-acetylene flame

Previous Next

Showing 381 to 400 of 767 mcqs