The rate of heat flow from a 50 mm thick wall of material having thermal conductivity of 40 W/m?C for a temperature difference of 10?C will be
A.80 W/m2 – hr
B.800 W/m2 – hr
C.8000 W/m2 – hr
D.200 W/m2 – hr
E.2000 W/m2 – hr
Category: Thermodynamics Mcqs
The mean free path of a gas least depends on
A.viscosity of gas
B.pressure of gas
C.density of gas
D.volume of gas
In a Carnot engine, when the working substance gives heat to the sink
A.The temperature of the sink increases
B.The temperature of the sink remains the same
C.The temperature of the source decreases
D.The temperature of both the sink and the source decreases
E.Changes depend on the operating conditions
In case of centrifugal compressors the phenomenon of fixed mass flow rate in compressor regardless of pressure ratio is known as
A.Surging
B.Stalling
C.Choking
D.Regeneration
E.Recirculation
Thermei is
A.A unit of temperature measurement
B.A unit of latent heat
C.A semi-conductor
D.An impurity added to a semi-conductor
E.Quantity of heat required to raise temperature of one tonne of water from 14.5?C to 15.5?C
Brayton cycles processes are
A.Two isentropics and two constant volume
B.Two isentropics and two constant pressure
C.One constant pressure, one constant volume, two adiabatics
D.Two isothermals constant volume a constant pressure
E.Two isothermals and two isentropics
If a system neither exchange mass nor energy with the surroundings, it is known as
A.Segregated system
B.Semi-closed system
C.Closed system
D.Isolated system
E.Inactive system
One watt is the same as
A.1 Nm/s
B.1 Nm/min
C.10 Nm/min
D.10 Nm/s
E.100 Nm/s
One bar pressure is the same as
A.1 N/m2
B.100 N/m2
C.1000 N/m2
D.100,000 N/m2
E.1000,000 N/m2
The RMS velocity of hydrogen gas at N.T.P. is nearly
A.839 m/s
B.1839 m/s
C.2839 m/s
D.3839 m/s
E.4839 m/s
