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NLC Technical Quiz 23

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Question 1

The process in which martensitic steel is reheated to reduce its brittleness without losing any significant portion of its hardness is called _________.

Question 2

Maximum efficiency of a Parson's turbine reaction turbine is 91%. Nozzle angle of the turbine will be ______ (in degree).

Question 3

A pipe of outside diameter 20 mm is to be insulated with a insulating material. The local coefficient of convective heat to the surroundings is 5 W/m²-K. The value of thermal conductivity of insulating material to reduce heat transfer?

Question 4

Light impurities in centrifugal castings are

Question 5

The bearing is subjected to a radial load of 4000 N. Expected life for 90% bearings is 9000 h and shaft is rotating at 1500 rpm. Calculate the dynamic load capacity _______.

Question 6

Slenderness ratio of column is the ratio of ________.

Question 7

A body of mass 20 kg is suspended from a spring which deflects 20 mm under this load. Calculate the frequency of free vibrations (in Hz) __________.

Question 8

COP of Carnot refrigerator operating between -3 ºC and 27 ºC is ________.

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