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GATE 2022 Rapid Revision Weekly Quiz 5

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Question 1

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

Question 2

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 3

Light impurities in centrifugal castings are

Question 4

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 5

Slenderness ratio of column is the ratio of ________.

Question 6

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 7

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

Question 8

The radial difference between addendum and dedendum of gear tooth is known as____.

Question 9

The atomic packing factor for a material with body centered cubic structure is

Question 10

An engine operates between temperature limits of 900 K and and another between and 400 K. For both to be equally efficient, the value of will be

Question 11

The path of contact and the arc of contact 20 mm and 30 mm respectively in a pair of involute spur gear. The pressure angle would be

Question 12

The efficiency of a centrifugal pump is maximum when its blades are_____.
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