(A) Sand (X)
(B) Magnesium silicate (X)
(C) Calcium silicate ()
(D) Iron pyrite (X)
Answers: Blast furnace slag is mainly molten Calcium silicate .
(A) Sulphur stick, which on detection gives white smoke ()
(B) Using chemical reagents (X)
(C) Its smell (X)
(D) Soap solution (X)
Answers: Ammomia leakage in the refrigeration system is detected by Sulphur stick which on detection given white smoke.
(A) Emissivity of pipe surface (X)
(B) Diameter & length of the pipe (X)
(C) Temperature of hot pipe surface & that of air in the room (X)
(D) None of these ()
Answers: Which of the following parameters is not responsible for the heat loss from a hot steam carrying bare pipe surface located in room without fans none of these.
(A) Grashoff number (X)
(B) Grashoff number & Reynolds number (X)
(C) Reynolds number (X)
(D) Grashoff number & Prandtl number ()
Answers: Transition from laminar to turbulent zone in free convection heat transfer is governed by the critical value of Grashoff number & Prandtl number.
(A) 2.5 ()
(B) 3.75 (X)
(C) 4.75 (X)
(D) 5.25 (X)
Answers; Cast iron contains 2.5 percent carbon .
(A) Ductile & resistant to corrosion/rusting (X)
(B) Weldable easily (X)
(C) Having uniform strength in all directions ()
(D) Having maximum tensile strength along the lines of slag distribution (X)
Answers: Wrought iron is not Having uniform strength in all direction .