The entropy may be expressed as a function of
Pressure and temperature
Temperature and volume
Heat and work
All of these
Correct Answer :
A. Pressure and temperature
Related Questions
Young's modulus is defined as the ratio of
Volumetric stress and volumetric strain
Lateral stress and lateral strain
Longitudinal stress and longitudinal strain
Shear stress to shear strain
The point of contra flexure is a point where
Shear force changes sign
Shear force is maximum
Bending moment changes sign
Bending moment is maximum
When a bar is cooled to - 5°C, it will develop
No stress
Shear stress
Tensile stress
Compressive stress
Strain is defined as the ratio of
Change in volume to original volume
Change in length to original length
Change in cross-sectional area to original cross-sectional area
Any one of the above
When the gas is heated at constant volume, the heat supplied
Increases the internal energy of the gas and increases the temperature of the gas
Does some external work during expansion
Both (A) and (B)
None of these
The extremeties of any diameter on Mohr's circle represent
Principal stresses
Normal stresses on planes at 45°
Shear stresses on planes at 45°
Normal and shear stresses on a plane
A thin cylindrical shell of diameter (D) and thickness (t) is subjected to an internal pressure (p). The ratio of longitudinal strain to volumetric strain is
(m - 1)/ (2m - 1)
(2m - 1)/ (m - 1)
(m - 2)/ (3m - 4)
(m - 2)/ (5m - 4)
The point of contraflexure is a point where
Shear force changes sign
Bending moment changes sign
Shear force is maximum
Bending moment is maximum
Percentage reduction of area in performing tensile test on cast iron may be of the order of
50 %
25 %
0 %
15 %
One kg of ethylene (C2H4) requires 2 kg of oxygen and produces 22/7 kg of carbon dioxide and __________ kg of water or steam.
9/7
11/7
7/4
1/4
The heat absorbed or rejected by the working substance is given by (where ds = Increase or decrease of entropy, T = Absolute temperature, and dQ = Heat absorbed or rejected)
δQ = T.ds
δQ = T/ds
dQ = ds/T
None of these
Coke is produced
When coal is first dried and then crushed to a fine powder by pulverising machine
From the finely ground coal by moulding under pressure with or without a binding material
When coal is strongly heated continuously for 42 to 48 hours in the absence of air in a closed vessel
By heating wood with a limited supply of air to a temperature not less than 280°C
The ideal efficiency of a Brayton cycle with regeneration, with increase in pressure ratio will
Increase
Decrease
Remain unchanged
Increase/decrease depending on application
In an extensive property of a thermodynamic system
Extensive heat is transferred
Extensive work is done
Extensive energy is utilised
None of these
The amount of heat required to raise the temperature of 1 kg of water through one Kelvin is called
Specific heat at constant volume
Specific heat at constant pressure
kilo-Joule
None of these
The shear force at the centre of a simply supported beam with a gradually varying load from zero at both ends to w per metre at the centre, is
Zero
wl/4
wl/2
wl²/2
Which of the following is correct?
Gauge pressure = Absolute pressure + Atmospheric pressure
Absolute pressure = Gauge pressure + Atmospheric pressure
Absolute pressure = Gauge pressure - Atmospheric pressure
Atmospheric pressure = Absolute pressure + Gauge pressure
A cycle consisting of two isothermal and two isentropic processes, is known as
Carnot cycle
Stirling cycle
Ericsson cycle
Joule cycle
When a gas is heated at constant pressure
Its temperature will increase
Its volume will increase
Both temperature and volume will increase
Neither temperature not volume will increase
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)
WD3n/Cd⁴
2WD3n/Cd⁴
4WD3n/Cd⁴
8WD3n/Cd⁴
Petrol is distilled at
65° to 220°C
220° to 345°C
345° to 470°C
470° to 550°C
When a body is subjected to three mutually perpendicular stresses, of equal intensity, the ratio of direct stress to the corresponding volumetric strain is known as
Young's modulus
Modulus of rigidity
Bulk modulus
Poisson's ratio
The ultimate analysis of coal consists of the determination of the percentage of
Carbon
Hydrogen and nitrogen
Sulphur and ash
All of these
The gas constant (R) is equal to the __________ of two specific heats.
Sum
Difference
Product
Ratio
When a closely-coiled helical spring of mean diameter (D) is subjected to an axial load (W), the stiffness of the spring is given by
Cd⁴/D3n
Cd⁴/2D3n
Cd⁴/4D3n
Cd⁴/8D3n
The maximum bending moment for the beam shown in the below figure, is
wl²/3√3
wl²/6√3
wl²/9√3
wl²/12√3
The ideal efficiency of a Brayton cycle without regeneration, with increase in pressure ratio will
Increase
Decrease
Remain unchanged
Increase/decrease depending on application
Strain re-setters are used to
Measure shear strain
Measure linear strain
Measure volumetric strain
Relieve strain
Carnot cycle consists of
Two constant volume and two isentropic processes
Two isothermal and two isentropic processes
Two constant pressure and two isentropic processes
One constant volume, one constant pressure and two isentropic processes
A beam is loaded as cantilever. If the load at the end is increased, the failure will occur
In the middle
At the tip below the load
At the support
Anywhere