541. Preheating prior to welding is done for the purpose of
A. Decreasing cooling rate
B. Facilitating fusion of high melting metals
C. Preventing hot cracking
D. Ensuring full penetration
✅ The correct answer is option A.
Engineering
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542. Projection welding & stud welding is categorised as the __________ welding.
A. Pressure
B. Thermit
C. Resistance
D. Arc
✅ The correct answer is option C.
543. In a neutral solution
A. H⁺ ions are absent
B. OH⁻ ions are absent
C. Both H⁺ and OH⁻ ions are present in very small but equal concentration
D. None of these
✅ The correct answer is option C.
544. The phenomenon occurring during explosion of a hydrogen bomb is
A. Nuclear fission
B. Nuclear fusion
C. A combination of both nuclear fission & fusion
D. None of these
✅ The correct answer is option C.
545. A pipeline buried in soil is commonly protected from corrosion by
A. Anodic protection
B. Cathodic protection
C. Using inhibitors
D. Using a special alloy resistant to corrosion
✅ The correct answer is option B.
546. Break even point represents the condition, when the company runs under no profit no loss condition. In break even analysis, total cost comprises of fixed cost
A. Only
B. Plus variable cost
C. Plus overhead cost
D. Plus selling expenses
✅ The correct answer is option B.
547. Diffusion co-efficient of a metal in a solid solution depends upon its
A. Composition
B. Temperature
C. Both A & B
D. Neither A nor B
✅ The correct answer is option C.
548. The radioactive isotope of hydrogen is
A. Deuterium
B. Tritium
C. Protium
D. None of these
✅ The correct answer is option B.
549. A balanced draught boiler furnace employs __________ draught fan.
A. Induced
B. Forced
C. Both A & B
D. Neither A nor B
✅ The correct answer is option C.
550. __________ furnace is generally used in the non-ferrous foundaries.
A. Direct arc
B. Indirect arc
C. Resistance
D. Induction
✅ The correct answer is option B.