#### Electrical engineering

• ( 1 ) Which of the following pump is generally used to pump highly viscous fluid?

• 1) Centrifugal pump
• 2) Reciprocating pump
• 3) Air lift pump
• 4) Screw pump
• Discussion in forum
Solution : Screw pump is generally used to pump highly viscous fluid.

discussion

• ( 2 ) A structure used to dam up a stream or river over which the water flows is called

• 1) orifice
• 2) dam
• 3) weir
• 4) None of these
• Discussion in forum
Solution : A structure used to dam up a stream or river over which the water flows is called weir. A structure, used to dam up a stream or river, over which the water flows, is called a weir. The conditions of flow, in the case of a weir, are practically the same as those of a rectangular notch. That is why, a notch is, sometimes, called as a weir and vice versa.

discussion

• ( 3 ) Density of water is maximum at

• 1) 0°C
• 2) 0°K
• 3) 4°C
• 4) 100°C
• Discussion in forum
Solution : water has very strong hydrogen bonding that creates structure in the molecules. Liquids that do not possess hydrogen bonding generally exhibit increasing density as temperature decreases as molecules pull tighter together. At temps below 4C, water begans to exhibit orientation due to hydrogen bonding. This network expands the volume of the liquid resulting in lower density.

discussion

• ( 4 ) The bulk modulus of elasticity

• 1) has the dimensions of 1/pressure
• 2) increases with pressure
• 3) is large when fluid is more compressible
• 4) is independent of pressure and viscosity
• Discussion in forum
Answer : 2) increases with pressure
Solution : bulk modulus = pressure/strain

discussion

Answer : 2) increases with pressure

• ( 5 ) Choose the correct relationship

• 1) specific gravity = gravity x density
• 2) dynamicviscosity = kinematicviscosity x density
• 3) gravity = specific gravity x density
• 4) kinematicviscosity = dynamicviscosity x density
• Discussion in forum
Answer : 2) dynamicviscosity = kinematicviscosity x density
Solution : dynamicviscosity = kinematicviscosity x density

discussion

Answer : 2) dynamicviscosity = kinematicviscosity x density

• ( 6 ) Falling drops of water become spheres due to the property of

• 2) cohesion
• 3) surface tension
• 4) viscosity
• Discussion in forum
Solution : Falling drops of water become spheres due to the property of surface tension which is caused by the cohesion of the water molecules.

discussion

• ( 7 ) Capillary action is due to the

• 1) surface tension
• 2) cohesion of the liquid
• 3) adhesion of the liquid molecules and the molecules on the surface of a solid
• 4) all of the above
• Discussion in forum
Answer : 4) all of the above
Solution : Capillary action occurs because water molecules bond each other strongly due to forces of cohesion and adhesion where water molecules are attracted and stick to other substances such as glass or paper. Adhesion of water to the surface of a material will cause an upward force on the liquid. The surface tension acts to hold the surface intact. Capillary action occurs when the adhesion to the surface material is stronger than the cohesive forces between the water molecules

discussion

Answer : 4) all of the above

• ( 8 ) Operation of McLeod gauge used for low pressure measurement is based on the principle of

• 1) gas law
• 2) Boyle's law
• 3) Charle's law
• 4) Pascal's law
• Discussion in forum
Solution : Operation of McLeod gauge used for low pressure measurement is based on the principle of Boyle's law

discussion

• ( 9 ) The velocity distribution of viscous fluid through a circular/pipe is :

• 1) hyperbolic
• 2) circular
• 3) parabolic
• 4) elliptical.
• Discussion in forum
Solution : The velocity distribution of viscous fluid through a circular/pipe is parabolic

discussion

• ( 10 ) A steady uniform flow is through

• 1) a long pipe at decreasing rate
• 2) a long pipe at constant rate
• 3) an expanding tube at constant rate
• 4) an expanding tube at increasing rate
• Discussion in forum
Answer : 2) a long pipe at constant rate
Solution : A steady uniform flow is through a long pipe at constant rate

discussion

Answer : 2) a long pipe at constant rate