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When coal is strongly heated continuously for 42 to 48 hours in the absence of air in a closed vessel, the process is known as __________ of fuel.
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4
Efficiency of a riveted joint is the ratio of its strength (max. load it can resist without failure) to the strength of the un-punched plate in
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4
Charles' law states that all perfect gases change in volume by __________ of its original volume at 0°C for every 1°C change in temperature, when pressure remains constant.
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4
Diesel cycle consists of following four processes
A. Two isothermal and two isentropic
B. Two isentropic and two constant volumes
C. Two isentropic, one constant volume and one constant pressure
D. Two isentropic and two constant pressures
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4
The strain energy stored in a body due to suddenly applied load compared to when it is applied gradually is
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4
The value of gas constant (R) in S. I. units is
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The maximum diameter of the hole that can be punched from a plate of maximum shear stress 1/4th of its maximum crushing stress of punch, is equal to (where t = Thickness of the plate)
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4
In an extensive property of a thermodynamic system
A. Extensive heat is transferred
B. Extensive work is done
C. Extensive energy is utilised
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If the depth is kept constant for a beam of uniform strength, then its width will vary in proportional to
A. Bending moment (i.e. M)
B. Bending moment² (i.e. M²)
C. Bending moment³ (i.e. M³)
D. Bending moment⁴ (i.e. M⁴)
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4
The atomic mass of oxygen is
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Modulus of rigidity is defined as the ratio of
A. Longitudinal stress to longitudinal strain
B. Volumetric stress to volumetric strain
C. Lateral stress to Lateral strain
D. Shear stress to shear strain
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4
Which of the following statement is correct?
A. The heat and work are boundary phenomena
B. The heat and work represent the energy crossing the boundary of the system
C. The heat and work are path functions
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4
One Joule (J) is equal to
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When two bodies are in thermal equilibrium with a third body, they are also in thermal equilibrium with each other. This statement is called
A. Zeroth law of thermodynamics
B. First law of thermodynamics
C. Second law of thermodynamics
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A process, in which the gas is heated or expanded in such a way that the product of its pressure and volume remains constant, is called
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4
A material obeys hooks law up to
D. Limit of proportionality
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A process, in which the temperature of the working substance remains constant during its expansion or compression, is called
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The entropy __________ in an irreversible cyclic process.
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According to kinetic theory of gases, the velocity of molecules __________ with the increase in temperature.
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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
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A column of length (l) with both ends fixed may be considered as equivalent to a column of length __________ with both ends hinged.
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When coal is first dried and then crushed to a fine powder by pulverising machine, the resulting fuel is called
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4
When the gas is cooled at constant pressure,
A. Its temperature increases but volume decreases
B. Its volume increases but temperature decreases
C. Both temperature and volume increases
D. Both temperature and volume decreases
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4
The gas constant (R) is equal to the
A. Sum of two specific heats
B. Difference of two specific heats
C. Product of two specific heats
D. Ratio of two specific heats
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4
The air standard efficiency of an Otto cycle is given by (where r = Compression ratio, and γ = Ratio of specific heats)
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4
The layer at the centre of gravity of the beam as shown in the below figure, will be
C. Neither in tension nor in compression
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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)
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A coil is cut into two halves, the stiffness of cut coil will be
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Which of the following statement is incorrect?
A. The liquid fuels consist of hydrocarbons.
B. The liquid fuels have higher calorific value than solid fuels.
C. The solid fuels have higher calorific value than liquid fuels.
D. A good fuel should have low ignition point.
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4
The safe twisting moment for a compound shaft is equal to the
A. Maximum calculated value
B. Minimum calculated value