Related Questions
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4
For same compression ratio and for same heat added
A. Otto cycle is more efficient than Diesel cycle
B. Diesel cycle is more efficient than Otto cycle
C. Efficiency depends on other factors
D. Both Otto and Diesel cycles are equally efficient
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4
The total strain energy stored in a body is termed a
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4
The amount of heat generated per kg of fuel is known as
D. Higher calorific value
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4
The ratio of direct stress to volumetric strain in case of a body subjected to three mutually perpendicular stresses of equal intensity, is equal to
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4
The intensity of stress which causes unit strain is called
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The gas turbine cycle with regenerator improves
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A mixture of gas expands from 0.03 m3 to 0.06 m3 at a constant pressure of 1 MPa and absorbs 84 kJ of heat during the process. The change in internal energy of the mixture is
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One molecule of oxygen consists of __________ atoms of oxygen.
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A vertical column has two moments of inertia (i.e. Ixx and Iyy ). The column will tend to buckle in the direction of the
B. Perpendicular to the axis of load
C. Maximum moment of inertia
D. Minimum moment of inertia
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The maximum diameter of the hole that can be punched from a plate of maximum shear stress 1/4th of its maximum crushing stress of punch, is equal to (where t = Thickness of the plate)
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Which of the following is an intensive property of a thermodynamic system?
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The ideal efficiency of a Brayton cycle without regeneration, with increase in pressure ratio will
D. Increase/decrease depending on application
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The maximum bending moment for the beam shown in the below figure, is
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Which of the following process can be made reversible with the help of a regenerator?
A. Constant pressure process
B. Constant volume process
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Which is the false statement about true stress strain method?
B. It is more sensitive to changes in both metallurgical and mechanical conditions
C. It gives a more accurate picture of the ductility
D. It can be correlated with stress strain values in other tests like torsion, impact, combined stress tests etc.
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When a beam is subjected to a bending moment, the strain in a layer is __________ the distance from the neutral axis.
B. Directly proportional to
C. Inversely proportional to
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The behaviour of super-heated vapour is similar to that of
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The amount of heat required to raise the temperature of the unit mass of gas through one degree at constant volume, is called
A. Specific heat at constant volume
B. Specific heat at constant pressure
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In an ideal gas turbine plant, it is assumed that the compression and expansion processes are
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If in the equation pvn = C, the value of n = ∝, then the process is called
A. Constant volume process
C. Constant pressure process
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When cut-off ratio is __________ the efficiency of Diesel cycle approaches to Otto cycle efficiency.
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When a gas is heated, change takes place in
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According to kinetic theory of gases, the velocity of molecules __________ with the increase in temperature.
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The variables which control the physical properties of a perfect gas are
A. Pressure exerted by the gas
B. Volume occupied by the gas
C. Temperature of the gas
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If percentage reduction in area of a certain specimen made of material 'A' under tensile test is 60% and the percentage reduction in area of a specimen with same dimensions made of material 'B' is 40%, then
A. The material A is more ductile than material B
B. The material B is more ductile than material A
C. The ductility of material A and B is equal
D. The material A is brittle and material B is ductile
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4
Kelvin-Planck's law deals with
C. Conversion of heat into work
D. Conversion of work into heat
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Stirling and Ericsson cycles are
C. Semi-reversible cycles
D. Adiabatic irreversible cycles
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When a closely-coiled helical spring of mean diameter (D) is subjected to an axial load (W), the deflection of the spring (δ) is given by (where d = Diameter of spring wire, n = No. of turns of the spring, and C = Modulus of rigidity for the spring material)
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A cycle consisting of two isothermal and two isentropic processes, is known as
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The ratio of root mean square velocity to average velocity of gas molecules at a particular temperature is