High speed steel tools retain their hardness upto a temperature of __________________ °C?
(A) 500
(B) 750
(C) 900
(D) 1100
As the fluid flow rate increases, the float of the Rotameter____________________?
(A) Rises in the tube
(B) Rotates at higher speed
(C) Rotates at lower speed
(D) Drops down in the tube
The minimum carbon content in steel should be ____________________ percent for it to respond to a hardening treatment ?
(A) 0.2
(B) 0.4
(C) 0.6
(D) 0.8
Blast furnace slag is mainly molten_________________?
(A) Sand
(B) Magnesium silicate
(C) Calcium silicate
(D) Iron pyrite
Ammonia leakage in the refrigeration system is detected by_________________?
(A) Sulphur stick, which on detection gives white smoke
(B) Using chemical reagents
(C) Its smell
(D) Soap solution
Which of the following parameters is not responsible for the heat loss from a hot steam carrying bare pipe surface located in a room without fans ?
(A) Emissivity of pipe surface
(B) Diameter & length of the pipe
(C) Temperature of hot pipe surface & that of air in the room
(D) None of these
Transition from laminar to turbulent zone in free convection heat transfer is governed by the critical value of ?
(A) Grashoff number
(B) Grashoff number & Reynolds number
(C) Reynolds number
(D) Grashoff number & Prandtl number
Wrought iron is not____________________?
(A) Ductile & resistant to corrosion/rusting
(B) Weldable easily
(C) Having uniform strength in all directions
(D) Having maximum tensile strength along the lines of slag distribution