391. Fatigue failure of a material results from __________ stress.
Tensile
Compressive
Fluctuating
None of these
✅ The correct answer is option C.
Materials and Construction MCQs
392. The metals occuring at the lower most position in the electromotive series
Do not resist corrosion
Resist corrosion very strongly
Are very brittle
Are heat insulators
✅ The correct answer is option B.
393. Chrome vanadium steels usually contain 0.8 to 1.1% Cr, 0.25 to 0.35% C and < 0.25% V. It is
Used for making axle & shafts of aeroplanes, automobiles and locomotives
Having poor fatigue resistance
Having poor toughness
Not helpful in producing cleaner steel due to oxidising action of vanadium
✅ The correct answer is option A.
394. __________ is never shipped in glass carboys.
Ammonia
Acetic acid
Phenol
Formaldehyde
✅ The correct answer is option A.
395. The hardest material just prior to diamond in Mhos scale is
Topax
Carborundum
Corrundum
Calcite
✅ The correct answer is option C.
396. Visco-elastic behaviour of materials which is time dependent is common in
Plastics
Crystalline solid
Non-crystalline solids
Non-crystalline organic polymer
✅ The correct answer is option D.
397. Which of the following is the most elastic material?
Plastic
Glass
Steel
Rubber
✅ The correct answer is option C.
398. Spark plugs, ignition tubes and electrodes are made of nickel __________ alloys.
Beryllium
Manganese
Copper
Iron
✅ The correct answer is option B.
399. Low carbon steels are those in which carbon percentage is around
0.1 to 0.35
0.4 to 0.7
0.8 to 1.5
1.5 to 2
✅ The correct answer is option A.
400. In drop forging process, the forging is done by dropping the __________ at high velocity.
Hammer
Workpiece
Die with hammer
Weight on hammer
✅ The correct answer is option C.