1.The velocities of the blade angles can be found out using________
a) Mach number
b) Froude’s number
c) Velocity triangles
d) Reynolds number
Explanation: The velocity triangle represents various components. It mainly determines the velocities of fluids that act in a turbomachinery. It can be drawn for both inlet and outlet triangles with its angles.
2. Which among the following velocities cannot be found using the velocity triangle?
a) Tangential
b) Whirl
c) Relative
d) Parabolic
Explanation: The velocity triangle represents various components. It mainly determines the velocities of fluids that act in a turbomachinery. It can be drawn for both inlet and outlet triangles with its angles.
3. Hydrodynamic cavitation is due to the process of _________
a) Vaporisation
b) Sedimentation
c) Filtration
d) Excavation
Explanation: Hydrodynamic cavitation is due to the process of vaporisation. A bubble generation takes place in which implosion occurs during the flowing of liquid.
4. The process of bubble generation leads to __________
a) High temperatures
b) High pressures
c) High energy densities
d) High volumetric ratio
Explanation: The process of bubble generation leads to high energy densities. The local temperatures and local pressures at this point last for a very short time. Thus, the option is ‘c’.
5. Super cavitation is the use of cavitation effect to create a bubble of steam inside a liquid.
a) True
b) False
Explanation: Yes, it is true. Super cavitation is the use of cavitation effect to create a bubble of steam inside a liquid. It is large to encompass an object passing through the liquid to reduce skin friction drag.
6.Degree of reaction turbine is the ratio of?
a) Pressure energy to total energy
b) Kinetic energy to total energy
c) Potential energy to total energy
d) Kinetic energy to potential energy
Explanation: Degree of reaction is defined to be the ratio of pressure and total energies inside the runner of a turbine.
7. Which of these options are best suited for the total energy change inside the runner per unit weight?
a) Degree of action
b) Degree of reaction
c) Turbulence
d) Efficiency of turbine
Explanation: Degree of reaction is defined to be the ratio of pressure and total energies inside the runner of a turbine.
8. When a container containing a liquid is rotated, then due to centrifugal action, then which of these energies are changed?
a) Kinetic energy
b) Pressure energy
c) Potential energy
d) Energy due to viscous force
Explanation: When a container containing a liquid is rotated, then due to centrifugal action there is a change in pressure energy.
9. For an actual reaction turbine, what should be the angle beta, such that the loss of kinetic energy at the outlet is to be minimum?
a) 90
b) 45
c) 60
d) 30
Explanation: Only when the angle beta is 90, V2 will be minimum so that loss of kinetic energy is minimized.
10. Discharge through a reaction flow reaction turbine is given by, Q = ______
a) Pi*d*b*Vf1
b) Pi*d*d*b*Vf1
c) Pi*d*b*b*Vf2
d) Pi*b*b*Vf1
Explanation: The discharge in a radial flow reaction turbine is the product of diameter, width and velocity of flow at inlet Vf1 with pi