The normal stress is the same in all directions at a point in a fluid, only when the fluid__________________?
(A) Is at rest & has zero viscosity
(B) Is frictionless
(C) Fluid layer has no motion relative to an adjacent layer of fluid
(D) is incompressible & frictionless
Hot extrusion of aluminium is done in the temperature range of ________________ °C ?
(A) 550-600
(B) 450-500
(C) 350-400
(D) 250-300
Diameter of the rivet to be provided on a 20 mm. thick boiler plate will be ______________ mm?
(A) 10
(B) 20
(C) 30
(D) 40
Nusselt number is related to the Reynolds number (Re) in turbulent & laminar flow respectively as______________________?
(A) Re0.5, Re0.8
(B) Re0.8, Re-0.5
(C) Re0.8, Re0.5
(D) Re-0.8, Re0.5
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
Which of the following mainly decides the current to be employed is arc welding ?
(A) Electrode size
(B) Plate thickness
(C) Voltage across the arc
(D) Welded portion length
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
Capacity & power requirement for an air compressor working at high altitude compared to sea-level will be_______________?
(A) More
(B) Less
(C) Same
(D) Either more or less; depends on the climatic conditions
Globular form of cementite is formed during the _________________ process ?
(A) Spheroidising
(B) Hardening
(C) Annealing
(D) Normalising