Related Questions
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The behaviour of a perfect gas, undergoing any change in the variables which control physical properties, is governed by
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The thermodynamic difference between a Rankine cycle working with saturated steam and the Carnot cycle is that
A. Carnot cycle can't work with saturated steam
B. Heat is supplied to water at temperature below the maximum temperature of the cycle
C. A Rankine cycle receives heat at two places
D. Rankine cycle is hypothetical
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4
A cycle consisting of __________ and two isothermal processes is known as Stirling cycle.
D. One constant pressure, one constant volume
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4
The ratio of maximum shear stress developed in a rectangular beam and a circular beam of the same cross-sectional area is
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The materials having same elastic properties in all directions are called
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The property of a material by virtue of which it can be beaten or rolled into plates is called
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The value of modulus of elasticity for mild steel is of the order of
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When a body is subjected to a direct tensile stress (σx) in one plane accompanied by a simple shear stress (τxy), the minimum normal stress is
A. (σx/2) + (1/2) × √(σx² + 4 τ²xy)
B. (σx/2) - (1/2) × √(σx² + 4 τ²xy)
C. (σx/2) + (1/2) × √(σx² - 4 τ²xy)
D. (1/2) × √(σx² + 4 τ²xy)
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One kg of hydrogen requires 8 kg of oxygen and produces
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The thickness of a thin cylindrical shell with hemispherical ends is __________ that of spherical ends.
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The polytropic index (n) is given by
B. log (p2/ p1)/log (v1/ v2)
C. log (v1/ v2)/ log (p1/p2)
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The torque transmitted by a solid shaft of diameter (D) is (where τ = Maximum allowable shear stress)
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When the expansion or compression takes place according to the law pvn = C, the process is known as
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The tensile strength of the welded joint for double fillet is (where s = Leg or size of the weld, l = Length of weld, and σt = Allowable tensile stress for weld metal)
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When it is indicated that a member is elastic, it means that when force is applied, it will
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The percentage reduction in area of a cast iron specimen during tensile test would be of the order of
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4
Which of the following materials is most elastic?
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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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The stress induced in a body due to suddenly applied load compared to when it is applied gradually is
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The energy stored in a body when strained within elastic limit is known as
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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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4
Slenderness of a column is zero when
B. Column is supported on all sides throughout the length
C. Length is equal to radius of gyration
D. Length is twice the radius of gyration
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The general law of expansion or compression is pvn = C, The process is said to be hyperbolic, if n is equal to
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The state of stress at a point in a loaded member is shown in the below figure. The magnitude of maximum shear stress is
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The smallest quantity of a substance, which can exist by itself in a chemically recognizable form is known as
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The neutral axis of the cross-section a beam is that axis at which the bending stress is
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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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The gas turbine cycle with regenerator improves
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During which of the following process does heat rejection takes place in Carnot cycle?
C. Isothermal compression
D. Isentropic compression
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For the same maximum pressure and temperature,
A. Otto cycle is more efficient than Diesel cycle
B. Diesel cycle is more efficient than Otto cycle
C. Dual cycle is more efficient than Otto and Diesel cycles
D. Dual cycle is less efficient than Otto and Diesel cycles