In the below figure, curve D represents_________.
Mild steel
Cast iron
Concrete
Bone of these
Correct Answer :
A. Mild steel
Related Questions
Otto cycle is also known as
Constant pressure cycle
Constant volume cycle
Constant temperature cycle
Constant temperature and pressure cycle
For a simply supported beam of length l, when a concentrated load W is applied in the centre of the beam, the maximum deflection is
5WL³/ 384EI
WL³/384EI
WL³/ 348EI
WL³/ 48EI
During a tensile test on a specimen of 1 cm cross-section, maximum load observed was 8 tonnes and area of cross-section at neck was 0.5 cm². Ultimate tensile strength of specimen is
4 tonnes/ cm²
8 tonnes/ cm²
16 tonnes/ cm²
22 tonnes/ cm²
The unit of energy is S. I. units is
Joule (J)
Joule metre (Jm)
Watt (W)
Joule/metre (J/m)
The reading of the pressure gauge fitted on a vessel is 25 bar. The atmospheric pressure is 1.03 bar and the value of 'g' is 9.81 m/s2. The absolute pressure in the vessel is
23.97 bar
25 bar
26.03 bar
34.81 bar
The entropy __________ in an irreversible cyclic process.
Remains constant
Decreases
Increases
None of these
The heat energy stored in the gas and used for raising the temperature of the gas is known as
External energy
Internal energy
Kinetic energy
Molecular energy
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
A close cycle gas turbine gives __________ efficiency as compared to an open cycle gas turbine.
Same
Lower
Higher
None of these
One reversible heat engine operates between 1600 K and T2 K and another reversible heat engine operates between T2 K and 400 K. If both the engines have the same heat input and output, then temperature T2 is equal to
800 K
1000 K
1200 K
1400 K
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
An open system is one in which
Heat and work crosses the boundary of the system, but the mass of the working substance does not crosses the boundary of the system
Mass of the working substance crosses the boundary of the system but the heat and work does not crosses the boundary of the system
Both the heat and work as well as mass of the working substance crosses the boundary of the system
Neither the heat and work nor the mass of the working substance crosses the boundary of the system
Shear modulus is the ratio of
Linear stress to linear strain
Linear stress to lateral strain
Volumetric strain to linear strain
Shear stress to shear strain
A column of length (l) with both ends fixed may be considered as equivalent to a column of length __________ with both ends hinged.
l/8
l/4
l/2
l
One kg of carbon monoxide requires 4/7 kg of oxygen and produces
11/3 kg of carbon dioxide gas
7/3 kg of carbon monoxide gas
11/7 kg of carbon dioxide gas
8/3 kg of carbon monoxide gas
When a thin cylindrical shell is subjected to an internal pressure, the volumetric strain is (where ε₁ = Hoop strain, and ε₂ = Longitudinal strain)
2ε₁ - ε₂
2ε₁ + ε₂
2ε₂ - ε₁
2ε₂ + ε₁
One molecule of oxygen consists of __________ atoms of oxygen.
2
4
8
16
Which of the following statement is wrong?
The deformation of the bar per unit length in the direction of the force is called linear strain.
The Poisson's ratio is the ratio of lateral strain to the linear strain.
The ratio of change in volume to the original volume is called volumetric strain.
The bulk modulus is the ratio of linear stress to the linear strain.
The specific heat of water is
1.817
2512
4.187
None of these
The hard coke is obtained when carbonisation of coal is carried out at
300° to 500°C
500° to 700°C
700° to 900°C
900° to 1100°C
The buckling load for a given column depends upon
Area of cross-section of the column
Length and least radius of gyration of the column
Modulus of elasticity for the material of the column
All of the above
Carbonisation of coal consists of
Drying and crushing the coal to a fine powder
Moulding the finely ground coal under pressure with or without a binding material
Heating the wood with a limited supply of air to temperature not less than 280°C
None of the above
A cycle consisting of __________ and two isothermal processes is known as Stirling cycle.
Two constant pressure
Two constant volume
Two isentropic
One constant pressure, one constant volume
A shaft revolving at ω rad/s transmits torque (T) in Nm. The power developed is
T.ω watts
2π. T.ω watts
2π. T.ω/75 watts
2π. T.ω/4500 watts
A body is subjected to a direct tensile stress of 300 MPa in one plane accompanied by a simple shear stress of 200 MPa. The maximum shear stress will be
-100 MPa
250 MPa
300 MPa
400 MPa
A process of heating crude oil to a high temperature under a very high pressure to increase the yield of lighter distillates, is known as
Cracking
Carbonisation
Fractional distillation
Full distillation
The percentage reduction in area of a cast iron specimen during tensile test would be of the order of
More than 50 %
25-50 %
10-25 %
Negligible
The behaviour of super-heated vapour is similar to that of
Perfect gas
Air
Steam
Ordinary gas
A pressure vessel is said to be a thick shell, when
It is made of thick sheets
The internal pressure is very high
The ratio of wall thickness of the vessel to its diameter is less than 1/10.
The ratio of wall thickness of the vessel to its diameter is greater than 1/10.
The natural solid fuel is
Wood
Coke
Anthracite coal
Pulverised coal