In case of ideal triatomic gas, the ratio of specific heats Cp/Cv would be
A.1
B.1.33
C.1.4
D.1.41
E.1.67
Category: Thermodynamics Mcqs
Kelvin’s law deals with
A.conservation of heat
B.conservation of work
C.conversion of heat into work
D.conversion of work into heat
The concept of black body in heat transfers applies to
A.Objects which are black in colour
B.Objects which are good conductors of heat
C.Objects that completely absorb impinging radiation
D.Objects well insulated from surroundings
Power required for the engine is
A.6.60 kW
B.7.75 kW
C.8.88 kW
D.9.23 kW
An ordinary mercury thermometer can be used for temperatures about
A.100?C
B.200?C
C.300?C
D.400?C
E.500?C
A surface which diffusely reflects and emits tha same amount of energy which it receives by radiation, is known as
A.A perfect surface
B.A perfect grey surface
C.A perfect white surface
D.A perfect radiating surface
E.None of the above
Theoretically in a petrol engine during which stroke both suction as well as exhaust valves will remain closed?
A.Suction stroke
B.Exhaust stroke
C.Both suction and exhaust strokes
D.None of the above
The mixture formation in a carburettor is based on the principle of
A.Law of vapours
B.Daltons law
C.Pascal’s law
D.Newtons law of motion
E.Venturi principle
A wall 50 mm thick (thermal conductivity k = 40 W/m?C) has temperature difference on two surfaces of 100?C. What could probably change if the temperature difference of this wall drops to 100?C
A.Thermal conductivity changes to 400 W/?C
B.Area of heat transfer increases 10 times
C.Thickness of wall increases to 500 mm
D.Thickness of wall reduces to 5 mm
E.Rate of heat flow drops to one tenth of the original
