301. Hardening of steel is not possible, unless it is heated __________ critical point.
A. Above the highest
B. Above the lowest
C. Between the first & second
D. Between the second & third
✅ The correct answer is option B.
Engineering
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303. The refractory lining of the bottom in a basic electric arc furnace is made of
A. Silica
B. Alumina
C. Magnesia
D. Fireclay
✅ 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.
305. Dislocation cross-slip is difficult in those materials, which have
A. Large number of slip systems
B. High work hardening rate
C. Coarse grain size
D. Low stacking fault energy
✅ The correct answer is option D.
306. Plasma is
A. A high temperature neutral gas
B. Nothing but ionised gas
C. A source of steady and highest controllable pressure
D. Formed at very low temperature
✅ The correct answer is option B.
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.
308. Hydrogen can be
A. Used in I.C. engines as fuel
B. Liquefied & stored under cryogenic conditions
C. Produced by electrolysis of water
D. All of the above
✅ The correct answer is option D.
309. RADAR is
A. Acronym for Radio Detection and Ranging
B. Name of technique for locating distant objects
C. Name of instrument for locating distant objects
D. All of the above
✅ The correct answer is option D.
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.