The expansion ratio (r) is the ratio of (where v1 = Volume at the beginning of expansion, and v2 = Volume at the end of expansion)
v1/v2
v2/v1
(v1 + v2)/v1
(v1 + v2)/v2
Correct Answer :
B. v2/v1
Related Questions
The energy absorbed in a body, when it is strained within the elastic limits, is known as
Strain energy
Resilience
Proof resilience
Modulus of resilience
The atomic mass of sulphur is
12
14
16
32
When coal is first dried and then crushed to a fine powder by pulverising machine, the resulting fuel is called
Wood charcoal
Bituminous coal
Briquetted coal
None of these
Otto cycle consists of following four processes
Two isothermals and two isentropic
Two isentropic and two constant volumes
Two isentropic, one constant volume and one constant pressure
Two isentropic and two constant pressures
A cycle consisting of two adiabatic and two constant pressure processes is known as
Otto cycle
Ericsson cycle
Joule cycle
Stirling cycle
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
Within elastic limit, stress is
Inversely proportional to strain
Directly proportional to strain
Square root of strain
Equal to strain
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
Which of the following statement is correct according to Clausis statement of second law of thermodynamics?
It is possible to transfer heat from a body at a lower temperature to a body at a higher temperature.
It is impossible to transfer heat from a body at a lower temperature to a body at a higher temperature, without the aid of an external source.
It is possible to transfer heat from a body at a lower temperature to a body at a higher temperature by using refrigeration cycle.
None of the above
When a rectangular beam is loaded transversely, the maximum compressive stress is developed on the
Top layer
Bottom layer
Neutral axis
Every cross-section
The efficiency of Stirling cycle is __________ Carnot cycle.
Greater than
Less than
Equal to
None of these
A riveted joint in which the number otrivets decrease from innermost to outer most rows is called
Chain riveted joint
Diamond riveted joint
Crisscross riveted joint
Zigzag riveted joint
Second law of thermodynamics defines
Heat
Work
Internal energy
Entropy
The thermal efficiency of an ideal gas turbine plant is given by (where r = Pressure ratio)
rγ - 1
1 - rγ - 1
1 - (1/r) γ/γ - 1
1 - (1/r) γ - 1/ γ
The general law of expansion or compression is pvn = C, The process is said to be hyperbolic, if n is equal to
0
1
γ
∝
The general gas equation is (where p = Pressure, v = Volume, m = mass, T = Absolute temperature, and R = Gas constant)
pv = mRT
pv = RTm
pvm = C
pv = (RT)m
When two plates are butt together and riveted with cover plates with two rows of rivets, the joint is known as
Lap joint
Butt joint
Single riveted single cover butt joint
Double riveted double cover butt joint
If Th is the torque resisting capacity of a hollow shaft and Ts is that of a solid shaft, of the same material, length and weight. Then,
Th > Ts
Th < Ts
Th = Ts
None of these
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
In compression test, the fracture in cast iron specimen would occur along
The axis of load
An oblique plane
At right angles to the axis of specimen
Would not occur
Diesel cycle consists of following four processes
Two isothermal and two isentropic
Two isentropic and two constant volumes
Two isentropic, one constant volume and one constant pressure
Two isentropic and two constant pressures
The deformation of a bar under its own weight is _________ the deformation, if the same body is subjected to a direct load equal to weight of the body.
Equal to
Half
Double
Quadruple
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.
Strain is equal to (where l = Original length, and δl = Change in length)
l/δl
δl/l
l.δl
l + δl
The efficiency of the Carnot cycle is (where T1 and T2 = Highest and lowest temperature during the cycle)
(T1/T2) - 1
1 - (T1/T2)
1 - (T2/T1)
1 + (T2/T1)
When a bar is cooled to - 5°C, it will develop
No stress
Shear stress
Tensile stress
Compressive stress
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)
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
The ideal efficiency of a Brayton cycle without regeneration, with increase in pressure ratio will
Increase
Decrease
Remain unchanged
Increase/decrease depending on application
The heating of a gas at constant pressure is governed by
Boyle's law
Charles' law
Gay-Lussac law
Avogadro's law