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BARC OCES 2022 Quiz 15

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Question 1

A rotating bar made of forged steel 50 mm in diameter (S_ut = 600 N/m²), is subjected to completely reverse bending stress. The corrected endurance limit (in MPa) of the bar is 100 N/mm². The fatigue strength of the bar for the life of 25000 cycles is

Question 2

A low carbon steel plates is to be welded by the manual metal arc welding process using a linear V-I characteristics DC power source. The following data are available
OCV of power source = 62 V
SSC = 130 A
Arc length =4 mm
Traverse speed of welding =150 cm/min
Efficiency of heat transfer = 85%
Voltage is given as V =20+1.5L
The actual heat input into workpiece will be

Question 3

Two very large parallel plane with emissivities 0.3 and 0.8 exchange radiative energy. The percentage reduction in radiative energy transfer when a polished aluminium radiation shield ( $Description: Description: E:\Gate\SSC JE Mechanical Part 1\Made Easy Questions\08_Heat-Transfer_BLok_files\image069.png$ ) is placed between them is __________%.

Question 4

For air near atmospheric condition, the ratio of thermal boundary layer to hydrodynamic boundary layer is ____________.(Assume ,near atmospheric condition Pr =1 for air)

Question 5

On increasing the heat transfer coefficient then the efficiency and the effectiveness of the fin respectively are

Question 6

Let then the smallest positive integer 'n' such that λ¹²is ____.

Question 7

Consider the differential equation,

Its complementary function is

Question 8

A water mains 140 cm inner diameter contains water at a pressure head of 200 m. A smooth flat plate 2 m wide and 2 m long is subjected to flow of water along its length at a uniform velocity of 2 m/s. The maximum thickness of boundary layer for the flow to be remain laminar will be ____ mm.

Question 9

An amount of 100 kW of heat is transferred through a wall in steady state. One side of the wall is maintained at 127 °C and the other side at 27 °C. The entropy generated (in W/K) due to the heat transfer through the wall is _______

Question 10

The life of a machine component under heavy test load was 28 hrs. The life under combined load was 35 hrs, out of which 21.5 hrs was at heavy load and 13.5 hrs was at the normal load. The expected life under the normal operating load is,

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