Related Questions
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Which of the following is the correct statement?
A. All the reversible engines have the same efficiency.
B. All the reversible and irreversible engines have the same efficiency.
C. Irreversible engines have maximum efficiency.
D. All engines are designed as reversible in order to obtain maximum efficiency.
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4
When a body is subjected to three mutually perpendicular stresses, of equal intensity, the ratio of direct stress to the corresponding volumetric strain is known as
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The heat and work are mutually convertible. This statement is called __________ law of thermodynamics.
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Which of the following is an intensive property of a thermodynamic system?
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The main cause for the irreversibility is
A. Mechanical and fluid friction
B. Unrestricted expansion
C. Heat transfer with a finite temperature difference
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4
A fletched beam is used to
A. Change the shape of the beam
B. Effect the saving in material
C. Equalise the strength in tension and compression
D. Increase the cross-section of the beam
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Two closely coiled helical springs 'A' and 'B' are equal in all respects but the number of turns of spring 'A' is half that of spring 'B' The ratio of deflections in spring 'A' to spring 'B' is
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The heat absorbed or rejected by the working substance is given by (where ds = Increase or decrease of entropy, T = Absolute temperature, and dQ = Heat absorbed or rejected)
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When shear force at a point is zero, then bending moment is _________ at that point.
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When a thin cylindrical shell is subjected to an internal pressure, the volumetric strain is (where ε₁ = Hoop strain, and ε₂ = Longitudinal strain)
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The fuel mostly used in cement industry and in metallurgical processes is
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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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When a closely-coiled helical spring of mean diameter (D) is subjected to an axial load (W), the stiffness of the spring is given by
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Those substances which have so far not been resolved by any means into other substances of simpler form are called
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One kg of carbon monoxide requires 4/7 kg of oxygen and produces
A. 11/3 kg of carbon dioxide gas
B. 7/3 kg of carbon monoxide gas
C. 11/7 kg of carbon dioxide gas
D. 8/3 kg of carbon monoxide gas
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4
Brayton cycle consists' of following four processes
A. Two isothermals 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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In the below figure, curve D represents_________.
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A shaft revolving at ω rad/s transmits torque (T) in Nm. The power developed is
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The condition for the reversibility of a cycle is
A. The pressure and temperature of the working substance must not differ, appreciably, from those of the surroundings at any stage in the process
B. All the processes, taking place in the cycle of operation, must be extremely slow
C. The working parts of the engine must be friction free
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Otto cycle consists of
A. Two constant volume and two isentropic processes
B. Two constant pressure and two isentropic processes
C. Two constant volume and two isothermal processes
D. One constant pressure, one constant volume and two isentropic processes
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4
If the slenderness ratio for a column is 100, then it is said to be a _________ column.
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Which of the following is a proper sequence?
A. Proportional limit, elastic limit, yielding, failure
B. Elastic limit, proportional limit, yielding, failure
C. Yielding, proportional limit, elastic limit, failure
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The stress at which extension of the material takes place more quickly as compared to the increase in load is called
A. Elastic point of the material
B. Plastic point of the material
C. Breaking point of the material
D. Yielding point of the material
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Modular ratio of two materials is the ratio of
C. Shear stress and shear strain
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The efficiency and work ratio of a simple gas turbine cycle are
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The efficiency of the Carnot cycle is (where T1 and T2 = Highest and lowest temperature during the cycle)
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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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Strain re-setters are used to
C. Measure volumetric strain
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Which of the following cycles is not a reversible cycle?
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The total elongation produced in a bar of uniform section hanging vertically downwards due to its own weight is equal to that produced by a weight
A. Of same magnitude as that of bar and applied at the lower end
B. Half the weight of bar applied at lower end
C. Half of the square of weight of bar applied at lower end
D. One fourth of weight of bar applied at lower end