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ESE 2022 ME - Technical Quiz 14

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Question 1

Water flows through a circular pipe of 60 cm diameter at a flow rate of 500 litres/sec. Pipe was connected with a nozzle whose exit diameter is 30 cm into the atmosphere. Neglecting losses and hydrostatic force the force exerted by water on the nozzle (in N) is

Question 2

Water flows through a pipe of diameter 20cm and length 50m when one end of the pipe is connected to a tank and other end of the pipe is open to the atmosphere. The pipe is horizontal and the height of water in the tank is 4m above the center of the pipe. Considering all minor losses determine the total energy at the inlet of the pipe. Take f= 0.036.

Question 3

Which of the following pairs describe the correct coordination number for body centred cubic and face centred cubic unit cell structures respectively?

Question 4

Which of the following surface hardening processes needs no quenching?

Question 5

A cube shaped casting solidifies in 5 min. The solidification time in min for a cube of the same material, which is 8 times heavier than the original casting, will be

Question 6

A cubical body, which is closely approximates a blackbody, is having dimension 20 cm and it is suspended in the air at 750 K. The spectral blackbody emissive power (in KW/m²-μm) at a wavelength of 4 micrometre is

Question 7

It is required to design a Hydrodynamic journal bearing for a bearing pressure of 1.7 N/mm². The load carried by the bearing is 8330 N. If the length of the journal is 70 mm. what is type of bearing?

Question 8

Consider the arrangement shown in the figure below where J is the combined polar mass moment of inertia of the disc and the shafts. K₁, K₂, K₃ are the torsional stiffness of the respective shafts. The natural frequency of torsional oscillation of the disc is given by
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Question 9

A counterflow heat exchanger is used to heat water from 40 °C to 100 °C by using hot exhaust gas entering at 150 °C and leaving at 90 °C. the LMTD for the heat exchanger is

Question 10

A straight wire 15m long is made of a material whose Young’s Modulus is 2 X

and coefficient of thermal expansion

What is the change in temperature (K) needed to produce an elongation of 15mm in the material?

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