A cycle consisting of one constant pressure, one constant volume and two isentropic processes is known as
Carnot cycle
Stirling cycle
Otto cycle
Diesel cycle
Correct Answer :
D. Diesel cycle
Related Questions
For a beam, as shown in the below figure, the deflection at C is (where E = Young's modulus for the beam material, and I = Moment of inertia of the beam section.
Wl3/48 EI
Wa²b²/3EIl
[Wa/(a√3) x EIl] x (l² - a²)3/2
5Wl3/384 EI
If a part is constrained to move and heated, it will develop
Principal stress
Tensile stress
Compressive stress
Shear stress
The stress induced in a body due to suddenly applied load compared to when it is applied gradually is
Same
Half
Two times
Four times
The torsional rigidity of a shaft is expressed by the
Maximum torque it can transmit
Number of cycles it undergoes before failure
Elastic limit up to which it resists torsion, shear and bending stresses
Torque required to produce a twist of one radian per unit length of shaft
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
In the below figure, the stress corresponding to point D is
Yield point stress
Breaking stress
Ultimate stress
Elastic limit
The thickness of a thin cylindrical shell with hemispherical ends is __________ that of spherical ends.
Equal to
More than
Less than
None of these
The state of a substance whose evaporation from its liquid state is complete, is known as
Vapour
Perfect gas
Air
Steam
The compression ratio for petrol engines is
3 to 6
5 to 8
15 to 20
20 to 30
Select the correct statement as per Charles' law
p.v = constant, if T is kept constant
v/T = constant, if p is kept constant
p/T = constant, if v is kept constant
T/p = constant, if v is kept constant
Those substances which have so far not been resolved by any means into other substances of simpler form are called
Elements
Compounds
Atoms
Molecules
Modulus of rigidity may be defined as the ratio of
Linear stress to lateral strain
Lateral strain to linear strain
Linear stress to linear strain
Shear stress to shear strain
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
The amount of heat required to raise the temperature of __________ water through one degree is called kilojoules.
1 g
10 g
100 g
1000 g
Modular ratio of two materials is the ratio of
Strains
Stress and strain
Shear stress and shear strain
Moduli and elasticity
The variables which control the physical properties of a perfect gas are
Pressure exerted by the gas
Volume occupied by the gas
Temperature of the gas
All of these
Otto cycle efficiency is higher than Diesel cycle efficiency for the same compression ratio and heat input because in Otto cycle
Combustion is at constant volume
Expansion and compression are isentropic
Maximum temperature is higher
Heat rejection is lower
The columns whose slenderness ratio is less than 80, are known as
Short columns
Long columns
Weak columns
Medium columns
The value of gas constant (R) in S. I. units is
0.287 J/kgK
2.87 J/kgK
28.7 J/kgK
287 J/kgK
Kelvin-Planck's law deals with
Conservation of work
Conservation of heat
Conversion of heat into work
Conversion of work into heat
One kg of carbon produces __________ kg of carbon dioxide.
3/7
7/3
11/3
3/11
The fuel mostly used in cement industry and in metallurgical processes is
Wood charcoal
Bituminous coke
Pulverised coal
Coke
A riveted joint in which every rivet of a row is opposite to other rivet of the outer row, is known as
Chain riveted joint
Diamond riveted joint
Crisscross riveted joint
Zigzag riveted joint
The efficiency of Stirling cycle is __________ Carnot cycle.
Greater than
Less than
Equal to
None of these
The heat and mechanical energies are mutually convertible. This statement was established by
Boyle
Charles
Joule
None of these
A process, in which the temperature of the working substance remains constant during its expansion or compression, is called
Isothermal process
Hyperbolic process
Adiabatic process
Polytropic process
The strain energy stored in a solid circular shaft subjected to shear stress (τ), is: (Where G = Modulus of rigidity for the shaft material)
τ²/ 2G × Volume of shaft
τ/ 2G × Volume of shaft
τ²/ 4G × Volume of shaft
τ/ 4G × Volume of shaft
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
Which of the following statement is correct?
The stress is the pressure per unit area
The strain is expressed in mm
Hook's law holds good upto the breaking point
Stress is directly proportional to strain within elastic limit
Youngs modulus of a wire is defined as the stress which will increase the length of wire compared to its original length by
Half
Same amount
Double
One-fourth