In an irreversible process, there is a
Loss of heat
No loss of heat
Gain of heat
No gain of heat
Correct Answer :
A. Loss of heat
Related Questions
In the below figure, the plastic range occurs
Before point A
Beyond point A
Between points A and D
Between points D and E
A cantilever beam is one which is
Fixed at both ends
Fixed at one end and free at the other end
Supported at its ends
Supported on more than two supports
The efficiency and work ratio of a simple gas turbine cycle are
Very low
Low
High
Very high
Which of the following cycles has maximum efficiency?
Rankine
Stirling
Carnot
Brayton
When a bar is subjected to a change of temperature and its deformation is prevented, the stress induced in the bar is
Tensile stress
Compressive stress
Shear stress
Thermal stress
When a body is subjected to two equal and opposite pushes, as a result of which the body tends to reduce its length, then
The stress and strain induced is compressive
The stress and strain induced is tensile
Both A and B is correct
None of these
The total strain energy stored in a body is termed a
Resilience
Proof resilience
Modulus of resilience
Toughness
If Kh is the torque resisting capacity of a hollow shaft and Ks is that of a solid shaft, of the same material, length and weight. Then,
Kh > Ks
Kh < Ks
Kh = Ks
None of these
Formula based on IS codes is based on
Straight line formula
Eulers formula
Rankines formula
Secant formula
Which of the following cycles is not a reversible cycle?
Carnot
Ericsson
Stirling
None of the above
The efficiency of Diesel cycle with decrease in cut-off
Increases
Decreases
First increases and then decreases
First decreases and then increases
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
Flow stress corresponds to
Fluids in motion
Breaking point
Plastic deformation of solids
Rupture stress
The weakest section of a diamond riveting is the section which passes through
The first row
The second row
The central row
One rivet hole of the end row
The hyperbolic process is governed by
Boyle's law
Charles' law
Gay-Lussac law
Avogadro's law
The rivets are used for __________ fastenings.
Permanent
Temporary
Semi-permanent
None of these
When shear force at a point is zero, then bending moment is _________ at that point.
Zero
Minimum
Maximum
Infinity
Steam coal is a
Pulverised coal
Brown coal
Coking bituminous coal
Non-coking bituminous coal
When wood is heated with a limited supply of air to a temperature not less than 280°C, the resulting fuel is
Coke
Wood charcoal
Bituminous coal
Briquetted coal
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
A column that fails due to direct stress, is called
Short column
Long column
Weak column
Medium column
The specific heat of water is
1.817
2512
4.187
None of these
The atomic mass of nitrogen is __________ oxygen.
Equal to
Less than
More than
None of these
Which of the following statement is correct?
The increase in entropy is obtained from a given quantity of heat at a low temperature.
The change in entropy may be regarded as a measure of the rate of the availability or unavailability of heat for transformation into work.
The entropy represents the maximum amount of work obtainable per degree drop in temperature.
All of the above
The efficiency of Diesel cycle approaches to Otto cycle efficiency when
Cut-off is increased
Cut-off is decreased
Cut-off is zero
Cut-off is constant
Resilience of a material is considered when it is subjected to
Frequent heat treatment
Fatigue
Creep
Shock loading
The extension of a circular bar tapering uniformly from diameter d₁ at one end to diameter d₂ at the other end and subjected to an axial pull of P is given by
δl = 4PE/ πl²
δl = 4πld²/PE
δl = 4Pl/πEd₁d₂
δl = 4PlE/ πd₁d₂
The ideal efficiency of a Brayton cycle with regeneration, with increase in pressure ratio will
Increase
Decrease
Remain unchanged
Increase/decrease depending on application
The state of a substance whose evaporation from its liquid state is complete, is known as
Vapour
Perfect gas
Air
Steam
In a free expansion process,
W1 - 2 = 0
Q1 - 2 = 0
dU = 0
All of these