A. √(Particle diameter)
B. Particle diameter
C. (Particle diameter)2
D. (Particle diameter)3
Related Mcqs:
- Melting point & boiling points of liquid oxygen are respectively – 218.8°C & – 183°C, while the same for liquid nitrogen is – 210°C & – 195.8°C respectively. The difference in melting points of liquid oxygen & liquid nitrogen is not equal to 8.8 ?
A. °C
B. °F
C. °K
D. °R - In Newton’s law of viscosity, which states that the shear stress is proportional to the _____________ Co-efficient of viscosity is called dynamic or absolute viscosity(where, V = velocity, Vg = velocity gradient) ?
A. V2
B. 1/V2
C. 1/Vg
D. Vg - During decarburising of a plain carbon steel, the thickness of ferrite layer growth is proportional to____________________?
A. Time
B. Square root of time
C. Square of time
D. Cube of time - Rain drops falling through atmospheric air attain limited terminal velocity, because of ____________________?
A. Upward thrust due to air
B. Viscous force exerted by air
C. Surface tension effects of water
D. Force of gravity - Velocity of a gas in sound is not proportional to (where, T = Absolute temperature of the gas. P = Absolute pressure of the gas. y = Ratio of specific heats (Cp/Cv) ρ = specific weight of the gas) ?
A. √T
B. 1/√P
C. √y
D. 1/√ρ - Absolute zero, pressure will occur, when the molecular momentum of the system becomes zero. A liquid will cease to exist as liquid at________________?
A. High vacuum
B. Zero pressure
C. 0°K
D. Earth’s centre - For the Stoke’s law to be valid in the case of a falling sphere in a fluid, the_____________________?
A. Reynolds number (based on sphere diameter) should be < 1
B. Flow around the sphere should be in turbulent region
C. Sphere must be metallic
D. Fluid density should be constant - A thin, flat & square plate measuring 2 m × 2 m is freely hanging in ambient air at 25°C. It is exposed to the solar radiation falling on one side of the plate at the rate of 500 W/m2. The plate temperature will remain constant at 30°C, if the convective heat transfer co-efficient is ________________ W/m2 °C ?
A. 50
B. 100
C. 150
D. 200 - Sub zero treatment of steel is done to____________________?
A. Suppress martensite transformation
B. Enhance its working performance in sub zero atmosphere
C. Reduce the retained austenite in hardened steel
D. Induce temper brittleness after its hardening - Uniform ramming of sand in green sand moulding process leads to____________________?
A. Reduced chance of gas porosity
B. Greater dimensional stability of the casting
C. Uniform flow of molten metal into the mould cavity
D. Less sand expansion type of casting defect
