391. The most suitable material for die casting is
A. Iron
B. Copper
C. Steel
D. Nickel
✅ The correct answer is option B.
Engineering
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392. Solution loss reaction occurs
A. In the blast furnace shaft
B. During pretreatment of hot metal
C. In the L.D. process
D. During deoxidation in the ladle
✅ The correct answer is option A.
393. Magnesium addition to cast iron increases its
A. Corrosion resistance
B. Creep strength
C. Ductility and strength in tension
D. Hardness
✅ The correct answer is option C.
394. Increasing sulphur content in pig iron tends to make it
A. Soft
B. Hard
C. Tough
D. Ductile & malleable
✅ The correct answer is option B.
395. A material having good damping property is likely to have
A. Greater defect density
B. Fine grained structure
C. Lesser defect density
D. High tensile strength
✅ The correct answer is option A.
396. Absolute zero, pressure will occur, when the molecular momentum of the system becomes zero. A liquid will cease to exist as liquid at
A. High vacuum
B. Zero pressure
C. 0°K
D. Earth
✅ The correct answer is option B.
397. The suction and delivery pressure for a two stage compressor are 1 and 25 atm respectively. The intermediate stage pressure would be around __________ atm.
A. 5
B. 10
C. 15
D. 20
✅ The correct answer is option A.
398. For efficient performance of a blast furnace, the extent of reduction of Wustite (FeO) should be
A. 100% indirect reduction
B. 100% direct reduction
C. 50-60% indirect reduction
D. 30-40% indirect reduction
✅ The correct answer is option C.
399. Which of the following is the most elastic material?
A. Plastic
B. Glass
C. Steel
D. Rubber
✅ The correct answer is option C.
400. Fatigue strength of a material can not be increased by
A. Cold working
B. Hot working
C. Shot peening
D. Any of these
✅ The correct answer is option B.