591. In __________ process, ions of salts react with water to produce acidity or alkalinity.
A. Hydration
B. Hydrolysis
C. Electrolysis
D. Dialysis
✅ The correct answer is option B.
Engineering
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592. An “orange peel” effect is observed
A. As a defect during metal casting/ welding
B. During deep drawing of metallic sheet having large grain size
C. During faulty heat treatment of steel
D. During extrusion of metal through a die
✅ The correct answer is option B.
593. During solid state sintering of powders, the following mechanism can be active.
A. Evaporation and condensation
B. Solid state diffusion processes
C. Liquid formation in grain boundaries
D. Creation of more dislocations
✅ The correct answer is option B.
594. Half life of a radioactive isotope corresponds to the time required for half of the __________ to decay.
A. Atoms
B. Neutrons
C. Nucleons
D. Electrons
✅ The correct answer is option A.
595. A material expanding freely due to heating will develop __________ stress.
A. No
B. Compressive
C. Tensile
D. Thermal
✅ The correct answer is option A.
596. __________ are not emitted by radioactive substances.
A. Α-rays
B. Β-rays
C. Protons
D. Positrons
✅ The correct answer is option C.
597. The most economical channel section for the fluid flow is the one for which the discharge is maximum for a given cross-sectional area. Vertical velocity distribution in an open channel for laminar flow can be assumed to be
A. Parabolic
B. Hyperbolic
C. Straight line
D. None of these
✅ The correct answer is option A.
598. In case of water (Prandtl number ≈ 6) flowing over a flat plate heated over the entire length, the thermal boundary layer thickness as compared to hydrodynamic boundary layer thickness is
A. Less
B. More
C. Equal
D. Unpredictable
✅ The correct answer is option A.
599. In practice, the compression ratio of compression-ignition (CI) engine ranges from
A. 15 to 25
B. 5 to 10
C. 40 to 55
D. 60 to 70
✅ The correct answer is option A.
600. The bank of tubes located at the back of the domestic refrigerators are the __________ tubes.
A. Refrigerant cooling
B. Evaporator
C. Condenser
D. Throttling
✅ The correct answer is option C.