the total radiation from a black body per second per unit area is directly proportional to the fourth power of the absolute temperature.

the wavelength corresponding to the maximum energy is proportional to the absolute temperature.

the ratio of the emissive power and absorptive power of all bodies is the same and is equal to the emissive power of a perfectly black body.

None of the above

rotor to static enthalpy rise in the stator

stator to static enthalpy rise in the rotor

rotor to static enthalpy rise in the stage

stator to static enthalpy rise in the stage

In a two-stage reciprocating air compressor with complete intercooling, maximum work is saved.

The minimum work required for a two-stage reciprocating air compressor is double the work required for each stage.

The ratio of the volume of free air delivery per stroke to the swept volume of the piston is called volumetric efficiency.

None of the above

Backward curved blades have poor efficiency

Backward curved blades lead to stable performance

Forward curved blades have higher efficiency

Forward curved blades produce lower pressure ratio

increase in the rate of heat transfer causes a reduction in the power output and efficiency of the engine.

excessive turbulence removes most of the insulating gas boundary layer from the cylinder walls.

high intensity of knock causes crankshaft vibration and the engine runs rough.

None of the above