After reaching the yielding stage while testing a mild steel specimen, strain
Becomes constant
Starts decreasing
Increases without any increase in load
None of the above
Correct Answer :
C. Increases without any increase in load
Related Questions
The general law for the expansion or compression of gases, is
pv = C
pv = m R T
pvn = C
pvγ = C
If both Stirling and Carnot cycles operate within the same temperature limits, then efficiency of Stirling cycle as compared to Carnot cycle
More
Less
Equal
Depends on other factors
When a beam is subjected to a bending moment, the strain in a layer is __________ the distance from the neutral axis.
Equal to
Directly proportional to
Inversely proportional to
Independent of
Which of the following gas has the highest calorific value?
Coal gas
Producer gas
Mond gas
Blast furnace gas
A simply supported beam with a gradually varying load from zero at B and w per unit length at A is shown in the below figure. The shear force at B is equal to
wl/6
wl/3
wl
2wl/3
The gas constant (R) is equal to the
Sum of two specific heats
Difference of two specific heats
Product of two specific heats
Ratio of two specific heats
Which of the following gas has a minimum molecular mass?
Oxygen
Nitrogen
Hydrogen
Methane
Reversed Joule cycle is known as
Carnot cycle
Bell-Coleman cycle
Rankine cycle
Stirling cycle
The fuel mostly used in blast furnace for extracting pig iron from iron ores is
Hard coke
Soft coke
Pulverised coal
Bituminous coal
A column is said to be a short column, when
Its length is very small
Its cross-sectional area is small
The ratio of its length to the least radius of gyration is less than 80
The ratio of its length to the least radius of gyration is more than 80
If in the equation pvn = C, the value of n = ∝, then the process is called
Constant volume process
Adiabatic process
Constant pressure process
Isothermal process
When gas is heated at constant pressure, the heat supplied is utilised in
Increasing the internal energy of gas
Doing some external work
Increasing the internal energy of gas and also for doing some external work
None of the above
The thermodynamic difference between a Rankine cycle working with saturated steam and the Carnot cycle is that
Carnot cycle can't work with saturated steam
Heat is supplied to water at temperature below the maximum temperature of the cycle
A Rankine cycle receives heat at two places
Rankine cycle is hypothetical
Formula based on IS codes is based on
Straight line formula
Eulers formula
Rankines formula
Secant formula
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 mass of excess air supplied is equal to
(23/100) × Mass of excess carbon
(23/100) × Mass of excess oxygen
(100/23) × Mass of excess carbon
(100/23) × Mass of excess oxygen
If the value of n = 0 in the equation pvn = C, then the process is called
Constant volume process
Adiabatic process
Constant pressure process
Isothermal process
The ratio of the largest load in a test to the original cross-sectional area of the test piece is called
Elastic limit
Yield stress
Ultimate stress
Breaking stress
The efficiency of Carnot cycle depends upon
Temperature limits
Pressure ratio
Volume compression ratio
Cut-off ratio and compression ratio
When the gas is cooled at constant pressure,
Its temperature increases but volume decreases
Its volume increases but temperature decreases
Both temperature and volume increases
Both temperature and volume decreases
The property of a material by virtue of which a body returns to its original, shape after removal of the load is called
Plasticity
Elasticity
Ductility
Malleability
A composite bar made up of steel and copper bars of equal lengths are heated through 100°C. The stresses developed shall be
Tensile in both the material
Tensile in steel and compressive in copper
Compressive in steel and tensile in copper
Compressive in both the materials
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
The material A is more ductile than material B
The material B is more ductile than material A
The ductility of material A and B is equal
The material A is brittle and material B is ductile
A circular shaft fixed at, A has diameter D for half of its length and diameter D/2 over the other half, as shown in the below figure. If the rotation of B relative to A is 0.1 radian, the rotation of C relative to B will be
0.4 radian
0.8 radian
1.6 radian
3.2 radian
For the constant pressure and heat input, the air standard efficiency of gas power cycle is in the order
Dual cycle, Diesel cycle, Otto cycle
Otto cycle, Diesel cycle, Dual cycle
Dual cycle, Otto cycle, Diesel cycle
Diesel cycle, Otto cycle, Dual cycle
Which of the following statement is incorrect?
The liquid fuels consist of hydrocarbons.
The liquid fuels have higher calorific value than solid fuels.
The solid fuels have higher calorific value than liquid fuels.
A good fuel should have low ignition point.
A definite area or a space where some thermodynamic process takes place is known as
Thermodynamic system
Thermodynamic cycle
Thermodynamic process
Thermodynamic law
Diamond riveted joint can be adopted in the case of following type of joint
Butt joint
Lap joint
Double riveted lap joints
All types of joints
According to Kelvin-Planck's statement, a perpetual motion of the __________ is impossible.
First kind
Second kind
Third kind
None of these
The mass of carbon per kg of flue gas is given by
(11/3) CO2 + (3/7) CO
(3/7) CO2 + (11/3) CO
(7/3) CO2 + (3/11) CO
(3/11) CO2 + (7/3) CO