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Mechanical Engineering Objective Questions { Hydraulic Machines }



113. Higher specific speed (300 to 1000) of turbine indicates that turbine is
A.Pelton wheel
B.Kaplan
C.Francis
D.Any one of the Love

114. A centrifugal pump draws in too much power compared to design value. It could be due to
A.Air leakage
B.Presence of air in water
C.Hot liquid
D.Heavy liquid

115. Air vessel used in reciprocating pumps are initially filled with
A.Compressed air
B.Water at high pressure
C.Vacuum
D.None of the above

116. Air vessels in reciprocating pump are used to
A.Smoothen flow
B.Reduce acceleration to minimum
C.Increase pump efficiency
D.Save pump from cavitation

117. Saving of work done and power by fitting an air vessel to single acting reciprocating pump is of the order of
A.39.2%
B.49.2%
C.68.8%
D.84.8%

118. Saving of work done and power by fitting an air vessel to double acting reciprocating pump is of the order of
A.39.2%
B.49.2%
C.68.8%
D.84.8%

119. According to fan laws, for fans having constant Wheel diameter, the air or gas capacity varies
A.Directly as fan speed
B.Square of fan speed
C.Cube of fan speed
D.Square root of fan speed

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