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In a reversible adiabatic process, the ratio of T1/T2 is equal to
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Petrol is distilled at
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The fuel mostly used in cement industry and in metallurgical processes is
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4
Which of the following gas has the highest calorific value?
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According to Regnault's law, the specific heat at constant pressure (cp) and specific heat at constant volume (cv) _________ with the change in pressure and temperature of the gas.
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4
Shear stress induced in a shaft subjected to tension will be
A. Maximum at periphery and zero at center
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4
According to Kelvin-Planck's statement, a perpetual motion of the __________ is impossible.
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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 behaviour of a perfect gas, undergoing any change in the variables which control physical properties, is governed by
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A riveted joint in which the number otrivets decrease from innermost to outer most rows is called
C. Crisscross riveted joint
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A definite area or a space where some thermodynamic process takes place is known as
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In open cycle gas turbine plants
A. The indirect heat exchanger and cooler is avoided
B. Direct combustion system is used
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The lower layer of the beam as shown in the below figure, will be
C. Neither in tension nor in compression
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One molecule of oxygen is __________ times heavier than the hydrogen atom.
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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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The limit of eccentricity for no tensile conditions for a column of circular section of diameter (D) is
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The heating of gas at constant volume is governed by
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Kerosene is distilled at
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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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4
A coil is cut into two halves, the stiffness of cut coil will be
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Kelvin-Planck's law deals with
C. Conversion of heat into work
D. Conversion of work into heat
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If the radius of wire stretched by a load is doubled, then its Youngs modulus will be
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The strain energy stored in a solid circular shaft in torsion, subjected to shear stress (τ), is: (Where, G = Modulus of rigidity for the shaft material)
A. τ²/ 2G × Volume of shaft
B. τ/ 2G × Volume of shaft
C. τ²/ 4G × Volume of shaft
D. τ/ 4G × Volume of shaft
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The thermal efficiency of an ideal gas turbine plant is given by (where r = Pressure ratio)
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For a simply supported beam of length l, when a concentrated load W is applied in the centre of the beam, the maximum deflection is
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The heat flows from a cold body to a hot body with the aid of an external source. This statement is given by
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4
A pressure vessel is said to be a thick shell, when
A. It is made of thick sheets
B. The internal pressure is very high
C. The ratio of wall thickness of the vessel to its diameter is less than 1/10.
D. The ratio of wall thickness of the vessel to its diameter is greater than 1/10.
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4
The ideal efficiency of a Brayton cycle without regeneration, with increase in pressure ratio will
D. Increase/decrease depending on application
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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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In the below figure, curve D represents_________.