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
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 maximum stress below which a material can withstand an infinite number of cycle of stress, is termed as the________________?
(A) Fatigue strength
(B) Creep strength
(C) Resilience
(D) Endurance limit
Hot working of lead is carried out at ___________________?
(A) 75°C
(B) 373°K
(C) 150°C
(D) Room temperature
The Al2O3 content of cryolite in Hall-Heroult cell is maintained between _______________ percent ?
(A) 2-5
(B) 18-20
(C) 12-15
(D) 6-12
Fatigue resistance of a material is measured by the _____________________?
(A) Elastic limit
(B) Ultimate tensile strength
(C) Young’s modulus
(D) Endurance limit
Ultimate strength in tension as compared to that in shear for steel is____________________?
(A) Half
(B) One third
(C) One and half times
(D) One fourth
Dry saturated steam can be converted into super heated steam by____________________?
(A) Increasing its cross-sectional area of flow
(B) Passing it through a pressure reducing valve
(C) Forcing it downwards through a vertical tube
(D) None of these
Which of the following alloying elements is present in maximum percentage in high speed steel ?
(A) Molybdenum
(B) Chromium
(C) Tungsten
(D) Vanadium
Baffles provided on the shell side of a shell and tube heat exchanger are meant for _____________________?
(A) Providing support for the tubes
(B) Improving heat transfer
(C) Both A & B
(D) Preventing the fouling of tubes & stagnation of shell side fluid