jH factor for heat transfer depends upon the ____________ number?
jH factor for heat transfer depends upon the ____________ number?
A. Biot
B. Nusselt
C. Reynolds
D. Prandtl
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With increase in temperature, the thermal conductivity of steel___________________?
With increase in temperature, the thermal conductivity of steel___________________?A. Increases
B. Decreases
C. Remains unchanged
D. Increases exponentiallyOverall heat transfer co-efficient for cooling of hydrocarbons by water is about_________________?
Overall heat transfer co-efficient for cooling of hydrocarbons by water is about_________________?A. 50 -100 Kcal/hr.m2.°C
B. 50 -100 W/m2.°K
C. 50 -100 BTU/hr. ft.2°F
D. 1000 – 1500 BTU/hr. ft.2°FA BTU/hr.ft.2 °F is equal to_________________?
A BTU/hr.ft.2 °F is equal to_________________?A. 1 kcal/hr. m2°C
B. 4.88 kcal/hr. m.2°C
C. 1 kcal/hr. m2.°K
D. None of theseIn forced circulation, the heating element is injected_________________?
In forced circulation, the heating element is injected_________________?A. Internally
B. Externally
C. Both A. and A.
D. Neither A. nor B.A cube, sphere & a thin circular plate (all having same mass and made of same material) are all heated to 300°C and allowed to cool in natural air. Which one will cool the slowest ?
A cube, sphere & a thin circular plate (all having same mass and made of same material) are all heated to 300°C and allowed to cool in natural air. Which one will cool the slowest ?A. Cube
B. Plate
C. Sphere
D. All will cool at the same rateIn Biot number, the characteristic length used is the ratio of the _______________ of the solid?
In Biot number, the characteristic length used is the ratio of the _______________ of the solid?A. Volume to surface area
B. Perimeter to surface area
C. Surface area to volume
D. Surface area to perimeter