A. Increase pressure
B. Increase temperature
C. Remove condensate
D. None of these
Related Mcqs:
- The steam ejector is used to__________________?
A. Remove condensate from the steam pipelines
B. Create vacuum
C. Superheat the steam
D. None of these - In the free convection regime of pool boiling, the heat flux is proportional to__________________?
A. Δt1/2
B. Δt2
C. Δt5/4
D. Δt - Vacuum is generally maintained in the vapour space of an evaporator mainly to__________________?
A. Get economical temperature difference by using moderate pressure steam
B. Facilitate forward feeding in multiple effect evaporation
C. Concentrate heat sensitive materials
D. Achieve very high concentration of the final product - The purpose of providing bleed points in the evaporator is to__________________?
A. Admit the feed
B. Remove the product
C. Facilitate removal of non-condensable gases
D. Create vacuum - The purpose of providing a ‘catchall’ in the vapor line of an evaporator is to__________________?
A. Create vacuum
B. Regulate the vapor flow
C. Vent the non-condensable gases
D. Arrest the entrained liquid - Which has the lowest Prandtl number ?
A. Liquid metal
B. Aqueous solution
C. Water
D. Lube oil - A single pass air heater is connected to a two pass unit. For the air flow rate and other conditions remaining the same, the film heat transfer co-efficient for air will vary in the ratio of__________________?
A. 2
B. 20.8
C. 20.2
D. 20.5 - Absorptivity and reflectivity of a perfect black body are respectively _______________?
A. 1 and 0
B. 0 and 1
C. 1 and ∞
D. 0 and 0.5 - The dimensionless group in mass transfer that is equivalent to Prandtl number in heat transfer is_________________?
A. Nusselt number
B. Sherwood number
C. Schmidt number
D. Stanton number - The rate of emission of radiation by a body does not depend upon the__________________?
A. Wavelength of radiation
B. Surface temperature of the body
C. Nature of the surface
D. Shape and porosity of the body
