For maximum discharge through a convergent nozzle the pressure ratio P2/P1 should be (where n is the isentropic expansion index)
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Solution
A gun barrel having mass 360 kg is made with the following data : Initial recoil velocity = 38 m/s. Recoil distance on firing = 1.6 m, then spring constant will be________× 103N/m
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The two contilevers A and B shown in the figure have the same uniform cross-section and the same material. Free end deflection of A is Δx. The value of mid-span deflection of cantilever B will be :
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For a heat engine operating on the Carnot cycle, the work output is 1/4th of the heat transferred to the sink. The efficiency of the engine will be ________
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A plane wall is 25 cm thick with an area of 1 m2 and has a thermal conductivity of 0.5 w/m-K. If the temperature difference of 60°C is there, then the heat flow will be
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A tank containing water has two orifices of the same size at depth of 40 cm and 90 cm below the free surface of water. The ratio of discharges through these orifices is
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In zinc blend structure each atom is surrounded by four atoms of opposite type, which are located at corners of which one of the following :
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Solution
In Zinc blend structure,each of the atom surrounded by four atoms of opposite type (co-ordinatio nnumber = 4) are located at the corners of tetrahedron.
In the figure given below, the force F, such that both the bars PR and QR (PR= QR) are identically loaded, will be________
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Solution
Apply conditions of equilibrium,
ΣFx= 0
Summation of horizontal forces = 0
F= 100 cos 45° = 70.71 kN
If yield stress is 280 MPa and factor of safety is 1.5, then static tensile load for a M36 × 4C bolt of mild steels will be ________
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By which of the following method, grey iron is generally welded ?
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Solution
For grey cast iron, gas welding is suitable.