Fluid Mechanics And Machinery Set 5

Mechanical Engineering

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This set of Fluid Mechanics and Machinery Multiple Choice Questions & Answers (MCQs) focuses on Fluid Mechanics And Machinery Set 5

Q1 | in centrifugal pumps.
  • true
  • false
Answer: true
Explaination:
centrifugal pumps are used to transport fluids. they transport fluids by conversion of energies. centrifugal pumps transport fluids by converting rotational kinetic energy to hydrodynamic energy.
Q2 | pump?
  • cost
  • simple in construction
  • efficiency
  • pump parameters
Answer: simple in construction
Explaination:
the major advantage of the centrifugal pump is that it has got a simple construction when compared to other types of centrifugal pumps.
Q3 | d) Radially head pressure
  • pressure
  • speed
  • power
  • fluid
Answer: fluid
Explaination:
centrifugal pumps are used to transport fluids. they transport fluids by conversion of energies. centrifugal pumps are a sub class of dynamic axisymmetric work absorbing turbomachinery.
Q4 | Different velocities in a centrifugal pump are determined by using  
  • velocity triangle
  • reynolds number
  • froude number
  • overall efficiency
Answer: velocity triangle
Explaination:
different velocities in a centrifugal pump are determined by using velocity triangle. this is an important triangle that determines the way the pump works.
Q5 | Due to its impeller action, centrifugal pumps can cover a wide range of fluid pump applications.
  • true
  • false
Answer: true
Explaination:
due to its impeller action, centrifugal pumps can cover a wide range of fluid pump applications. thus, the impeller action plays an important role.
Q6 | With the increase in the input power, efficiency  
  • increases
  • decreases
  • same
  • independent
Answer: decreases
Explaination:
with the increase in the input power, efficiency decreases. as the input power is inversely proportional to the efficiency of the pump.
Q7 | What is unit of standard acceleration?
  • kg/m
  • kg/s
  • kg/m3
  • n/m
Answer: kg/m3
Explaination:
the unit of standard acceleration of the centrifugal pump is kg/m3. it is denoted as g. it is also called as the acceleration due to gravity.
Q8 | What does PSP stand for?
  • pump start procedure
  • positive start pump
  • pump start pointer
  • positive start pointer
Answer: pump start procedure
Explaination:
psp stands for pump start procedure. it is the basic method to start the pump by lining up the pump valves in a sequence by ensuring that the drain valve is closed.
Q9 | Centrifugal pump is a 
  • turbomachinery
  • flow regulating device
  • drafting device
  • intercooling device
Answer: turbomachinery
Explaination:
centrifugal pump is a turbomachinery. turbomachines are machines that transfer energy between a rotor and a fluid, including both turbines and compressors. it is a mechanical device.
Q10 | Turbomachines work under  
  • newtons first law
  • newtons second law
  • newtons third law
  • kepler’s law
Answer: newtons second law
Explaination:
turbomachines work under newtons second law. centrifugal pump is a turbomachinery. turbomachines are machines that transfer energy between a rotor and a fluid, including both turbines and compressors. it is a mechanical device.
Q11 | The main function of nozzle is to
  • varying temperatures
  • pressure variations
  • load variations
  • heat variations
Answer: pressure variations
Explaination:
the main function of nozzle is to vary the pressure of fluid passing through the nozzle. it is done by opening and shutting the sets of nozzles. thus, its main function is to regulate pressure of the fluid.
Q12 | The main function of centrifugal pumps are to  
  • transfer speed
  • transfer pressure
  • transfer temperature
  • transfer energy
Answer: transfer energy
Explaination:
the primary objective of a centrifugal pump is to transfer energy.
Q13 | Centrifugal pumps transfer energy from
  • rotor to fluid
  • fluid to rotor
  • draft to rotor
  • rotor to draft
Answer: rotor to fluid
Explaination:
centrifugal pumps transfer energy from rotor to fluid. the primary objective of a centrifugal pump is to transfer energy. centrifugal pump is a turbomachinery.
Q14 | controlled by  
  • head race
  • gate
  • tail race
  • pump
Answer: gate
Explaination:
the inlet passage of water entry is controlled by the gate opening. the gate opening is an opening that sends only a percentage of fluid through the inlet passages for water to enter to the turbine.
Q15 | Centrifugal pumps are a sub class of dynamic axisymmetric work absorbing turbomachinery.
  • true
  • false
Answer: true
Explaination:
the statement is true. centrifugal pumps are a sub class of dynamic axisymmetric work absorbing turbomachinery. the main function of centrifugal pumps are to transfer energy.
Q16 | Turbines and compressors work with the gas, while centrifugal pump transfers energy.
  • true
  • false
Answer: true
Explaination:
turbines and compressors work with the gas, while centrifugal pump transfers energy. centrifugal pumps transfer energy from rotor to fluid. the primary objective of a centrifugal pump is to transfer energy.
Q17 | Centrifugal pump is a turbomachinery.
  • pressure
  • speed
  • power
  • fluid
Answer: fluid
Explaination:
centrifugal pumps are used to transport fluids. they transport fluids by conversion of energies. centrifugal pumps are a sub class of dynamic axisymmetric work absorbing turbomachinery.
Q18 | Centrifugal pumps transport fluids by converting  
  • kinetic energy to hydrodynamic energy
  • hydrodynamic energy to kinetic energy
  • mechanical energy to kinetic energy
  • mechanical energy to hydrodynamic energy
Answer: kinetic energy to hydrodynamic energy
Explaination:
centrifugal pumps are used to transport fluids. they transport fluids by conversion of energies. centrifugal pumps transport fluids by converting rotational kinetic energy to hydrodynamic energy.
Q19 | With the increase in load, Energy in the turbine 
  • decreases
  • increases
  • remains same
  • independent
Answer: decreases
Explaination:
when there is an increase in the load, the energy in the turbine is drained off.
Q20 | The rotational kinetic energy comes from
  • engine motor
  • pump
  • tank
  • draft tube
Answer: engine motor
Explaination:
centrifugal pumps transport fluids by converting rotational kinetic energy to hydrodynamic energy. the rotational kinetic energy comes from engine or electrical motor.
Q21 | When the balancing of the turbine is disturbed, we use  
  • throttle governing
  • steam governing
  • nozzle governing
  • emergency governing
Answer: emergency governing
Explaination:
when the balancing of the turbine is disturbed, we use emergency governing. these governors come into action
Q22 | The fluid coming into the centrifugal pump is accelerated by  
  • throttle
  • impeller
  • nozzle
  • governor
Answer: impeller
Explaination:
the fluid coming into the centrifugal pump is accelerated by an impeller. the fluid enters the pump along a radially outward direction into the diffuser or a volute chamber.
Q23 | Reciprocating pump is a  
  • negative displacement pump
  • positive displacement pump
  • diaphragm pump
  • emulsion pump
Answer: positive displacement pump
Explaination:
reciprocation pump is a type of positive displacement pump. it has a piston pump, plunger and diaphragm. reciprocating pumps have a good life provided that they are not left untouched.
Q24 | What happens to the reciprocating pump when left untouched?
  • efficiency decreases
  • wear and tear
  • surface expansion
  • pressure change
Answer: surface expansion
Explaination:
when left untouched over a period of time, the reciprocating pump undergoes wear and tear. reciprocating pumps have a good life provided that they are not left untouched.
Q25 |   into the chamber
  • liquid
  • pressure
  • heat
  • electricity
Answer: liquid
Explaination:
reciprocating pumps operate by drawing liquid into the chamber or the cylinder with the help of a piston.
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