A frictionless heat engine can be 100% efficient only if its exhaust temperature is
A.Equal to its input temperature
B.Less than its input temperature
C.0?C
D.0?K
E.?100?C
Category: Engineeeing Mcqs
In Kando system for electric locomotion
A.dc supply is used to run series motors
B.single phase supply is converted into three phase system
C.three phase ac is converted into dc
D.single phase ac is converted into dc
A relationship between the temperature of a black body and the wavelength at which the maximum value of monochromatic emission power occurs, is established under
A.D’ lambert’s rule
B.Wein’s displacement law
C.Stefan-Bolzmann’s law
D.Kirchhoff’s law
E.Planck’s law
For an organisation those costs which do not, increase as output increases, are known as
A.Fixed costs
B.Variable costs
C.Total costs
D.Average fixed costs
E.Average total costs
If the oxygen is entirely removed from a fire by smothering it with foram the combustion will
A.slow down
B.stop entirely
C.speed up
D.not be affected at all
Which of the following material has the lowest weight/volume ratio?
A.Wheat
B.Oats
C.Lignite
D.Charcoal
The expression (A2-A1)/loge (A2/A1) for a hollow cylinder is known as
A.Logarithmic mean radius
B.Mean area of heat transfer
C.The rate of heat transfer
D.None of the above
Which of the following statement about gates is incorrect?
A.he size of gate depends upon the rate of solidification
B.A small gate is used for castings which solidify rapidly
C.More than one gate may be used to feed a fast freezing casting
D.A gate should not have sharp edges
The mass of helium is about
A.half of the mass of neutron
B.one-fourth of the mass of proton
C.twice the mass of deuterium
D.same as the mass of tritium
When all the forces acting on a body lie in one plane and their lines of action meet at one point, the forces
A.constitute a couple
B.constitute a moment
C.are known as non-coplaner forces
D.are known as coplaner-concurrent forces.
