328. __________ of grey cast iron produces white cast iron.
A. Tempering
B. Rapid heating
C. Rapid cooling
D. Slow cooling
✅ The correct answer is option B.
330. A pycnometer is used for the measurement of
A. Flow rate of molten metal
B. Specific gravity of a liquid
C. Composition of alloys
D. Concentration of a solution
✅ The correct answer is option B.
332. Iron has got __________ isotopes.
A. No
B. Four
C. Three
D. Two
✅ The correct answer is option B.
334. Mho’s scale of hardness, which consists of 10 standard minerals is used for the measurement of __________ hardness.
A. Scratch
B. Indentation
C. Dynamic
D. Rebound
✅ The correct answer is option A.
336. The routing function in a production system design is concerned with the
A. Material flow optimisation through the plant
B. Machine utilisation
C. Quality control of the product
D. Manpower utilisation
✅ The correct answer is option B.
338. __________ test determines the yield strength, Young’s modulus of elasticity, percentage reduction in area & percentage elongation of a material.
A. Tensile
B. Fatigue
C. Impact
D. None of these
✅ The correct answer is option A.
340. The two elements required to form substitutional solid solution should not have
A. Same crystalline structure
B. Same valancy
C. Widely differing electronegativity
D. Same atomic sizes
✅ The correct answer is option C.
304. Work hardenable alloy steel used to make the bucket wheel excavators, blades of bulldozers and other earth moving equipments contain iron, carbon and
A. Manganese
B. Silicon
C. Nickel
D. Chromium
✅ The correct answer is option A.
307. Which of the following pairs is not correctly matched?
A. Uranium – 233 : Fertile material
B. Bindingenergy : Mass defect
C. Scattering : Absorption cross-section
D. Number of nucleons : Mass number
✅ The correct answer is option A.
310. High relative humidity decreases the evaporative process and as the temperature is increased, the relative humidity decreases. The comfort range for human body is the ambient temperature of 22 to 27°C with relative humidity ranging from __________ percent.
A. 5 to 10
B. 15 to 25
C. 45 to 50
D. 75 to 80
✅ The correct answer is option C.