Kerala PSC Tracer Paper 2016

Kerala Public Service Commission Tracer Paper 2016

The dynamic viscosity of most of the gases ________with rise in temprature
(a) increase
(b) decrease
(c) Does not change significantly
(d) None of these

Buoyant force is __________
(a) Resultant of up thrust and gravity forces acting on the body
(b) Resultant force on the body due to the fluid surrounding it
(c) Equal to the volume of liquid displaced by the body
(d) Resultant of static weight of body and dynamic thrust of liquid

The type of flow in which the velocity of every particle varies from point to point, or every instant in direction and magnitude is called as
(a) Laminar flow
(b) Uniform flow
(c) Steady flow
(d) Iurbulent flow

The point in the immersed body through which the resultant pressure of liquid may be taken to act is known as
(a) Centre of buoyancy
(b) Metacentre
(c) Centre of gravity
(d) Centre of pressure

The condition at which a piezometer cannot be used
(a) Velocity is high
(b) Pressure difference is low
(c) Fluid is highly viscous
(d) Fluid in the pipe is a gas

________ changes with coefficient of discharge of an orifice
(a) Reynold’s number
(b) Weber number
(c) Froude number
(d) Mach number

Bernoulli’s equation cannot be applied when the flow is
(a) Unsteady
(b) Rotational
(c) Turbulent
(d) All of the above

A body is placed inside a tank. If one metr water column is present above the object, what will be the pressure acting upon it ?
(a) 1 Pa
(b) 9810 Pa
(c) 981 Pa
(d) 98.1 Pa

Which among the following possesses highest density?
(a) Carbon tetrachloride
(b) Air
(c) Clycerin
(d) Castor oil

________________ is a regular shaped opening on one side of the liquid vessel provided for quantity measurement, with the liquid surface kept below the top edge of it.
(a) Orifice
(b) Weir
(c) Notch
(d) None of these

The top of weir is known as
(a) Sill or crest
(b) Orifice
(c) Nappe or van
(d) None of these

The hammer blow effect occurs in pipes due to ___________
(a) The flow of liquid gradually brought to rest by closing the valve
(b) The excessive leakage
(c) Bursting under high pressur of liquid
(d) Sudden stopping of flow

Impulse turbine may be utilized at streams having __________
(a) High discharge
(b) High head
(c) Low head
(d) Medium head

The ratio of quantities of liquid discharged from pump to that passing through impeller at unit time is known as ______
(a) Mechanical efficiency
(b) Overall efficiency
(c) Volumetric efficiency
(d) Manometric efficiency

The percentage of power saving may be attained in a single acting reciprocating pump by the installation of an air vessel is
(a) 48.8%
(b) 78.4%
(c) 84.4%
(d) 39.2%