Nitriding of a steel part does not increase its__________________?
(A) Grain size
(B) Fatigue limit
(C) Surface hardness
(D) Wear resistance
Heat transfer to the water wall in a high pressure water wall type boiler furnace is mainly by_________________?
(A) Conduction
(B) Convection
(C) Radiation
(D) Both
Evaporative cooling process employs a combination of cooling and humidification in which the____________________?
(A) Sensible heat is added
(B) Sensible heat is removed and the latent heat is added
(C) Latent heat is removed
(D) Sensible heat is added and latent heat is removed
According to thermodynamic Fahrenheit scale, the fundamental interval between ice point to steam point is__________________?
(A) 180°
(B) 212°
(C) 32°
(D) 273°
Case hardening of a material is__________________?
(A) Followed by tempering or carburising
(B) Preceded by its tempering
(C) Done to get a soft ductile interior with a very hard surface
(D) Carried out to get extreme hardness in its core
Milk is fat dispersed in water. It is an example of__________________?
(A) Suspension
(B) Emulsion
(C) Gel
(D) Solution
Cemented carbide tools are not suitable for cutting___________________?
(A) Aluminium
(B) Brass
(C) Cast iron
(D) Steel
Annealing of white cast iron produces _____________________ iron?
(A) Grey
(B) Nodular
(C) Malleable
(D) Spheroidal
Direct conversion of thermal energy to electrical energy is facilitated by the____________________?
(A) Fuel cells
(B) Photo voltaic cell
(C) Magneto hydrodynamic generator
(D) None of these
A dense structure of grinding wheel is not used for the_____________________?
(A) Ductile material
(B) Hard materials
(C) Brittle materials
(D) Finishing cuts