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65. The temperature at which ferromagnetic material can no longer be magnetised by the outside forces, is termed as the

A. Critical point

B. Curie temperature

C. Inversion temperature

D. Eutectic temperature

✅ The correct answer is option B.

67. Leakage in a cooking gas cylinder is detected by

A. Radio-isotopes

B. Pouring soap solution on the surface and locating the gas bubbles

C. Halide torch

D. Pungent smell of mercaptans present in the gas

✅ The correct answer is option D.

69. Secondary hardening in steels arises out of the

A. Precipitation of fine alloy carbides at high temperatures

B. Refinement of ferrite grain size by working

C. Decomposition of retained austenite upon heat treatment

D. Precipitation of complex inter-metal-lics upon heat treatment

✅ The correct answer is option C.

71. Speisses is a mixture of the following:

A. Arsenides of heavy metals

B. Antimonides of heavy metals

C. Arsenides & antimonides of heavy metals

D. Iron, cobalt and nickel

✅ The correct answer is option A.

35. Batch process is preferred over continuous process, when the

A. Product yields and quality can not be achieved in continuous process, because of long residence time

B. Sales demand of product is not steady

C. Same equipment can not be used for several processes of the same nature

D. All of the above

✅ The correct answer is option B.

37. In the blast furnace, incorporation of water vapour in the blast gives the following effect.

A. Increases the reducing potential of the gas

B. Increases the flame temperature

C. No significant change occurs

D. Increases the hydrogen content in the metal

✅ The correct answer is option A.

39. Existence of velocity potential implies that the fluid is

A. Irrotational

B. Ideal

C. Compressible

D. In continuum

✅ The correct answer is option A.

42. The __________ of a double acting reciprocating pump as compared to the single acting pump will be almost double.

A. Flow output

B. Head developed

C. Overall efficiency

D. Weight

✅ The correct answer is option A.

45. LASER

A. Stands for Light Amplification by Stimulated Emission of Radiation

B. Has the same intensity as visible light

C. Can’t be used for cutting metals

D. None of these

✅ The correct answer is option A.

48. In chemical dehumidification process

A. Wet bulb temperature increases

B. Dry bulb temperature remains constant

C. Dew point temperature increases

D. Dry bulb temperature increases

✅ The correct answer is option B.

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