691. With increase in carbon percentage in steel, its
A. Yield stress decreases
B. Elongation percent increases
C. Tensile strength increases
D. Impact strength increases
✅ The correct answer is option C.
Chemical Engineering
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692. Dryness factor of steam is defined as the ratio of the mass of vapor in the mixture to the mass of the mixture. Dryness factor of steam is measured by a __________ calorimeter.
A. Bomb
B. Throttling
C. Junker’s
D. Boy’s
✅ The correct answer is option B.
693. Measurement of the area of the indented surface is not involved in the __________ hardhes testing method.
A. Vicker’s
B. Rockwell
C. Knoop
D. Brinell
✅ The correct answer is option B.
694. Which of the following is not an ore of aluminium?
A. Troosite
B. Kaolin
C. Alunite
D. Cryolite
✅ The correct answer is option A.
695. Which of the following will resist maxi-mum shock & vibration without cracking?
A. Grey cast iron
B. White cast iron
C. Malleable iron
D. Graphite
✅ The correct answer is option C.
696. To improve the machinability of steel, it is generally subjected to
A. Spherodising
B. Tempering
C. Normalising
D. Annealing
✅ The correct answer is option A.
697. Absolute zero pressure can be attained at a temperature of
A. 0°C
B. 50°K
C. 0°R
D. None of these
✅ The correct answer is option C.
698. __________ are normally subjected to sub-zero treatment.
A. Highly stressed parts
B. Gauges or precision parts
C. Cold rolled sheets
D. Non machinable materials
✅ The correct answer is option B.
699. Cathodic protection is widely used in controlling corrosion in
A. High pressure vessels
B. Marine structure & underground pipelines
C. Overhead fuel gas pipelines
D. Overhead water pipelines
✅ The correct answer is option B.
700. __________ joint is usually used for joining cast iron pipes mostly used for temporary pipelines, where it may be necessary to dismantle & reassemble the pipeline very frequently.
A. Collar
B. Flanged
C. Bell and Spigot
D. Expansion
✅ The correct answer is option B.