A grey body is one whose absorptivity	1. does not vary with temperature and wavelength of the incidentray 2. is equal to its emissivity 3. varies with temperature 4. varies with wavelength of the incident ray
A liquid is in equilibrium with its vapor at its boiling point.On an average, the molecules in the liquid and gaseous phases haveequal	1. potential energy. 2. kinetic energy. 3.temperature. 4. intermolecular forces of attraction.
A liquid of density 1000 kg/m3 flows through a pipediameter 1 inch at velocity of 1.5 m/s, given frictionfactor 0.00025, calculate the frictional pressure drop perunit length?	1. 88.5 N/m2 2. 80.5 N/m2 3. 10 N/m2 4. 100 N/m2
A methanol-water vapor liquid system is at equilibrium at60 °C and 60 kPa. The mole fraction of methanol in liquidis 0.5 and in vapor is 0.8. Vapor pressure of methanol and water at60 °C are 85 kPa and 20 kPa respectively. Assumingvapor phase to be an ideal gas mixture, what is the activitycoefficient of water in the liquid phase?	1. 1.2 2. 1.6 3. 7.5 4. 0.3
A piece of metal of specific gravity 13.6 is placed inmercury of specific gravity 13.6, what fraction of it’s volumeis under mercury?	1. the metal piece will be immersed in mercury by half 2. the metal piece will simply float over the mercury 3. metal piece will sink to the bottom 4. whole of the metal piece will be immersed with its topsurface just at mercury level
A rhinoceros is weighed on a large 2 m x 2 mscale at the zoo. If the rhinoceros weighs 40 000 N, how muchpressure is exerted on the pad beneath the scale?	1. 160 kPa 2. 404 kPa 3. 10 kPa 4. 100 kPa
Calculate the total power requirement for a mass flow rate of5 kg/s, and a static head of 5 m. Efficiency of pump is70%.	1. 35.7 W 2. 5.0 W 3. 25.7 W 4. 15.7 W
Capacity (in tons/hr) of jaw/gyratory crusher is equal to(where, L = length of the receiving opening, cm S = greater widthof the discharge opening, cm)	1. 0.01 L.S 2. 0.087 L.S 3. L.S/0.087 4. L.S
Convection heat transfer happens predominantly due to	1. Conduction in the boundary layer 2. Bulk motion of the fluid 3. Newton’s law of cooling 4.high viscosity

Dietus-Boelter equation used for the determination of heattransfer coefficient is valid	1. Laminar internal flow 2. Laminar external flow 3. Turbulent external flow 4. Turbulent internal flow
Effectiveness - NTU method is applied whenever	1. Maximum heat transfer possible needs to be calculated 2. exit temperatures of both hot & cold streams needs becalculated 3. accurate results are needed 4. efficiency of the heat exchanger needs to be calculated
For an evaporator or condenser, LMTD for a parallel flow is	1. greater than that of counter flow 2. lesser than that of counter flow 3. same as that counter flow 4. greater than cross flow

Answer all MCQs correctly with proper explanation.