Plastics as a material of construction suffer from the drawback of low_________________?
(A) Machinability
(B) Density
(C) Strength
(D) Plastic deformation
A reduction in thermal resistance during heat transfer does not occur in the___________________?
(A) Convection heat transfer by stirring the fluid and cleaning the heating surface
(B) Conduction heat transfer by reduction in the material thickness and increase in the thermal conductivity
(C) Radiation heat transfer by increasing the temperature and reducing the emissivity
(D) None of these
Colour comparator is used to measure the___________________?
(A) pH value
(B) Electrode potential
(C) Colour intensity
(D) None of these
Volume of blast furnace slag is about _______________ times the volume of hot metal (pig iron) of the same weight ?
(A) 1.5
(B) 3
(C) 5
(D) 7
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
Powder metallurgy technique is used in the production of ____________________ tools ?
(A) Tungsten carbide
(B) High carbon steel
(C) High speed steel
(D) Drilling
Chlorine acts as a bleaching agent only in the presence of ______________________?
(A) Dry air
(B) Pure oxygen
(C) Moisture
(D) Sunlight
Upto the critical radius of insulation, added insulation, will____________________?
(A) Increase the heat loss
(B) Decrease heat loss and will have no effect beyond that
(C) Decrease heat flux
(D) Reduce convection heat loss compared to conduction heat less
The process of removal of scale formed during hot rolling of steel is termed as_________________?
(A) Descaling
(B) Shot blasting
(C) Pickling
(D) Skimming
Alcohols are not suitable as diesel engine fuel because the cetane number of alcohols is____________________?
(A) Very low which prevents their ignition by compression
(B) Very high which prevents their ignition by compression
(C) Zero
(D) None of these