551. Addition of __________ to steel does not impart hardness.
A. Nickel
B. Copper
C. Chromium
D. Silicon
✅ The correct answer is option B.
Engineering
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552. Which of the following is not used as a bearing material?
A. Copper-lead alloys
B. Babbits
C. Bronzes
D. Cermets
✅ The correct answer is option D.
553. Draft allowance given to patterns is for
A. Compensating the liquid state shrinkage
B. Easy removal of pattern from the mold cavity
C. Providing support for the core placement
D. Compensating the solidification shrinkage
✅ The correct answer is option B.
554. In __________ process, there is an increase in entropy with no degradation of energy.
A. Isothermal expansion
B. Isochoric heat addition
C. Polytropic expansion
D. Isobaric heat addition
✅ The correct answer is option A.
555. The gases used in the treatment of asthma is a mixture of __________ and oxygen.
A. Helium
B. Argon
C. Neon
D. None of these
✅ The correct answer is option A.
556. Surface tension of a liquid
A. Is due to intermolecular forces of cohesion
B. Decreases with rise in temperature
C. Is responsible for the spherical shape of an isolated liquid drop
D. All of the above
✅ The correct answer is option D.
557. Electrode potential is not concerned with the measurment of
A. PH value
B. Temperature
C. Viscosity
D. Density
✅ The correct answer is option B.
558. Annealing of a material does not
A. Permit its further cold working
B. Soften it
C. Case harden it
D. None of these
✅ The correct answer is option C.
559. Which of the following if present in iron ore, enhances its value?
A. Alumina
B. Alkali oxide
C. Lime & Magnesia
D. None of these
✅ The correct answer is option C.
560. ‘Cryogenics’ is concerned with the generation & use of low temperature in the range of
A. 0°K to 123°K
B. 0°C to – 123°C
C. 0°C to – 273°C
D. 0°K to 273°K
✅ The correct answer is option A.