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ESE Prelims 2022 Achievers Quiz 1

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Question 1

Heat is generated steadily in a 3 cm diameter spherical ball. The ball is exposed to ambient air at 26^oC with a heat transfer coefficient of 7.5 W/m²-^oC. The ball is to be covered with a material of thermal conductivity 0.15 W/m-^oC. If the ball surface temperature remains as constant, the thickness of the covering material that will maximize heat generation within the ball, is _________.

Question 2

What is the optimum length of time between orders in EOQ model with a total time horizon of one year?

Question 3

The maximum interference in mm after assembly between a bush of size

mm and shaft

mm of size is __________.

Question 4

A full journal bearing having diametral clearance to diameter ratio of

using a lubricant with viscosity (Z) of

Pa-s, support the shaft journal running at N = 2400 rpm. If bearing pressure is 1.4 MPA. The Sommerfeld number is ____

Question 5

A flywheel of moment of inertia 9.8 kg m² fluctuates by 30 rpm, if the fluctuation in the speed is not to exceed ±3%, Then the mean angular speed of the flywheel is. Take ∆E = 3 kJ

Question 6

Coefficient of restitution is

Question 7

Choose the correct statement about the effect of changing various operating conditions of a vapour compression refrigeration cycle:

Question 8

What is the magnification factor in the case of steady state response when frequency ratio is 0.8 is_____

(neglect damping effects)

Question 9

In an internal combustion engine, during the compression stroke the heat rejected to the cooling water is 50 kJ/kg and the work input is 100 kJ/kg. What is the change in internal energy of the working fluid ?

Question 10

The entry nozzle angle of an elementary Impulse turbine is

. For maximal diagram efficiency, calculate the

ratio

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ESE & GATE ME General

Jan 12ESE & GATE ME