in water bubbles formation, which on rupture cause cavitation
A. Pressure falls below the vapour pressure
B. Pressure becomes very high
C. Temperature becomes low
D. All A, B & C
Related Mcqs:
- Brass parts with high residual tensile stress at the surface are susceptible to season cracking (i.e. spontaneous cracking occuring on exposure to atmospheric corrosion), if its zinc percentage is more than ?
A. 5
B. 10
C. 20
D. 35 - A semi-conductor is damaged & behaves like a conductor, on passing a strong electric current through it, because it heats up the crystals & breaks the covalent bonds resulting in _______________ electrons ?
A. Lack of free
B. Excess of
C. Decrease in
D. None of these - _______________ is the hardest oxide and is hence used where high wear resistance at high temperature is required?
A. Beryllium
B. Zirconia
C. Alumina
D. Magnesia - Elimination of brittleness resulting from welding of saw blades is done by __________________ of the welded portion ?
A. Annealing
B. Toughening
C. Work hardening
D. Tempering - Principal alloying elements of cast tool alloys which have very high wear resistance & high temperature strength are ?
A. Cobalt, chromium & tungsten
B. Cobalt, chromium & nickel
C. Molybdenum, tungsten & chromium
D. Cobalt, zirconium & molybdenum - 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 - A gas which is collected over water becomes moistened due to water vapor, exerts its own partial pressure at the gas temperature, which is termed as its_______________?
A. Aqueous tension
B. Saturated humidity
C. Vapor pressure
D. Absolute humidity - 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 - The critical pressure at which the latent heat of vaporization of steam becomes zero is _____________ Kg/cm2 ?
A. 273.15
B. 225.65
C. 100.03
D. 373.15 - _________________ can replace tungsten in high speed steel ?
A. Chromium
B. Vanadium
C. Cobalt
D. Molybdenum
