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Author name: Admin

947. Temperature of hot gases flowing in a pipe is measured by a thermocouple inserted in the thermal well. The thermal well made of __________ will facilitate the most accurate measurement of the temperature.

A. Copper

B. Steel

C. Aluminium

D. Brass

✅ The correct answer is option A.

950. On decreasing the grain size of a polycrys-talline material, the property most likely to deteriorate is

A. Creep

B. Toughness

C. Tensile strength

D. Fatigue

✅ The correct answer is option B.

953. Principal alloying elements of cast tool alloys which have very high wear resistance & high temperature strength are

A. Cobalt, chromium & tungsten

B. Cobalt, chromium & nickel

C. Molybdenun, tungsten & chromium

D. Cobalt, zirconium & molybdenum

✅ The correct answer is option A.

956. What happens, when SO₂ is passed through a solution of H₂S in water?

A. Precipitation of sulphur takes place

B. H₂SO₃ is formed

C. Oleum is formed

D. None of these

✅ The correct answer is option A.

959. Fine grained steels have

A. High brittleness

B. Higher tendency to distort

C. High ductility

D. None of these

✅ The correct answer is option C.

962. Even though heat transfer co-efficients in boiling liquids is large, use of fins is advantageous, when the entire surface is exposed to __________ boiling.

A. Film

B. Nucleate

C. Transition

D. All of the above

✅ The correct answer is option A.

965. The power of a low capacity prime mover is most suitably measured by a __________ type dynamometer.

A. Driving

B. Transmission

C. Absorption

D. None of these

✅ The correct answer is option C.

967. Out of the following, the most ductile material is

A. Mild steel

B. Copper

C. Nickel

D. Aluminium

✅ The correct answer is option A.

969. The heat treatment to which the steel wire containing > 0.25% carbon is subjected to is

A. Full annealing

B. Bright annealing

C. Patenting

D. None of these

✅ The correct answer is option C.

971. Probability of cavitation occuring becomes very high, when the local __________ resulting in water bubbles formation, which on rupture cause cavitation

A. Pressure falls below the vapour pressure

B. Pressure becomes very high

C. Temperature becomes low

D. All of the above

✅ The correct answer is option D.

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