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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 maximum normal stress i
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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4
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
A process of heating crude oil to a high temperature under a very high pressure to increase the yield of lighter distillates, is known as
C. Fractional distillation
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Which of the following is the extensive property of a thermodynamic system?
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A body is subjected to a tensile stress of 1200 MPa on one plane and another tensile stress of 600 MPa on a plane at right angles to the former. It is also subjected to a shear stress of 400 MPa on the same planes. The maximum normal stress will be
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4
Otto cycle is also known as
A. Constant pressure cycle
C. Constant temperature cycle
D. Constant temperature and pressure cycle
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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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Young's modulus is defined as the ratio of
A. Volumetric stress and volumetric strain
B. Lateral stress and lateral strain
C. Longitudinal stress and longitudinal strain
D. Shear stress to shear strain
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4
True stress strain-curve for materials is plotted between
A. Load/original cross-sectional area and change in length/original length
B. Load/ instantaneous cross-sectional area and loge (original area/ instantaneous area)
C. Load/ instantaneous cross-sectional area and change in length/ original length
D. Load/ instantaneous area and instantaneous area/original area
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4
The heat and mechanical energies are mutually convertible. This statement was established by
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The ultimate tensile stress of mild steel compared to ultimate compressive stress is
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The ratio of root mean square velocity to average velocity of gas molecules at a particular temperature is
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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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4
In closed cycle gas turbine, the air is compressed
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An isothermal process is governed by
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A thin mild steel wire is loaded by adding loads in equal increments till it breaks. The extensions noted with increasing loads will behave as under
C. First increase and then decrease
D. Increase uniformly first and then increase rapidly
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Carnot cycle has maximum efficiency for
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In an ideal gas turbine plant, it is assumed that the compression and expansion processes are
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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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The heat supplied to the gas at constant volume is (where m = Mass of gas, cv = Specific heat at constant volume, cp = Specific heat at constant pressure, T2 - T1 = Rise in temperature, and R = Gas constant)
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4
A beam is loaded as cantilever. If the load at the end is increased, the failure will occur
B. At the tip below the load
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A process, in which the working substance neither receives nor gives out heat to its surroundings during its expansion or compression, is called
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One kg of carbon monoxide requires __________ kg of oxygen to produce 11/7 kg of carbon dioxide gas.
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4
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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Stirling and Ericsson cycles are
C. Semi-reversible cycles
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For the same compression ratio, the efficiency of Diesel cycle is __________ Otto cycle.
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When a gas is heated, change takes place in
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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 which material the Poisson's ratio is more than unity
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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.