A. 75°C
B. 373°K
C. 150°C
D. Room temperature
Related Mcqs:
- Hot dipping process is used for coating a low melting point metal (e.g. Pb, Sn, Zn) on iron, steel & copper having relatively higher melting points. Which of the following is not a hot dipping process ?
A. Galvanising
B. Tinning
C. Sherardizing
D. None of these - Hot & cold working of material causes its _______________ deformation?
A. Visco-elastic
B. Isotropic
C. Elastic
D. Plastic - Lead is poured into the joints between two ___________________ pipes?
A. Cast iron
B. Steel
C. Concrete
D. Plastic - 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 - Temperature of hot gases flowing in a pipe is measured by a thermocouple inserted in the thermal well. The thermal well made of ______________ will facilitate the most accurate measurement of the temperature ?
A. Copper
B. Steel
C. Aluminium
D. Brass - Which of the following metals cannot be hot worked at room temperature ?
A. Zinc
B. Nickel
C. Lead
D. Tin - Hot extrusion of aluminium is done in the temperature range of ________________ °C ?
A. 550-600
B. 450-500
C. 350-400
D. 250-300 - In a counter flow heat exchanger, hot fluid enters at 170°C & leaves at 150°C, while the cold fluid enters at 50°C & leaves at 70°C. The arithmetic mean temperature difference in this case is ______________ °C?
A. 20
B. 60
C. 120
D. ∞ - Specific gravity of hot metal (pig iron) is ______________ times that of the blast furnace slag ?
A. 2
B. 3
C. 0.8
D. 6 - Parallel straight line pattern of temperature distribution for both hot and cold fluids is observed in case of heat exchanger of the type________________?
A. Parallel flow with equal heat capacities
B. Counter flow with equal heat capacities
C. Counter flow with unequal heat capacities
D. Parallel flow with unequal heat capacities
