A. Tempering
B. Normalising
C. Stress-relieving
D. Artificial ageing
✅ The correct answer is option C.
Basic Chemical Engineering MCQs
Austenite is not
A. Ductile
B. Malleable
C. Magnetic
D. Soft
✅ The correct answer is option C.
Factor of safety in machine design is defined as the ratio of ultimate stress to __________ stress.
A. Working
B. Bearing
C. Yield
D. None of these
✅ The correct answer is option A.
__________ is the most important element, which controls the physical properties of steel.
A. Manganese
B. Silicon
C. Carbon
D. Vanadium
✅ The correct answer is option C.
A polymer is termed as an ‘elastomer’, if its percentage elongation is more than 100%. An elastomer is termed as ‘rubber’ if its percentage elongation is more than __________ percent.
A. 150
B. 200
C. 300
D. 400
✅ The correct answer is option B.
The size of the tetrahedral void in the closest packing of atoms is __________ that of the octahedral void.
A. Equal to
B. Greater than
C. Less than
D. Either A, B or C; depends on the size of atom
✅ The correct answer is option C.
Sub zero treatment of steel is done to
A. Suppress martensite transformation
B. Enhance its working performance in sub zero atmosphere
C. Reduce the retained austenite in hardened steel
D. Induce temper brittleness after its hardening
✅ The correct answer is option C.
Age hardening is connected with
A. Babbit metal
B. Gun metal
C. Stainless steel
D. Duralumin
✅ The correct answer is option D.
With increase in temperature, the electrical conductivity of semiconductors
A. Increases
B. Decreases
C. Remain constant
D. Either A or B, depends on the type of semi-conductor
✅ The correct answer is option A.
A hot short metal is
A. Hard when hot
B. Brittle when cold
C. Brittle when hot
D. Brittle under all conditions
✅ The correct answer is option C.