Fluid Mechanics And Machinery Set 12

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 12

Q1 | Jet propulsion works on the principle of                 
  • newton’s first law
  • newton’s second law
  • newton’s third law
  • thermodynamic properties
Answer: newton’s third law
Q2 | How is absolute velocity at inlet denoted?
  • v
  • v1
  • c
  • v
Answer: v1
Q3 | The relative velocity is obtained by the equation                   
  • u – v1
  • v1
  • u*v1
  • u/v1
Answer: u – v1
Q4 | If the friction is neglected, then               
  • vr1 > vr2
  • vr1 < vr2
  • vr1 = vr2
  • vr1 is a zero
Answer: vr1 = vr2
Q5 | If the pressure remains a constant, then
  • vr1 > vr2
  • vr1 < vr2
  • vr1 = vr2
  • vr1 is a zero
Answer: vr1 = vr2
Q6 | Through inlet orifices, which are facing the direction of motion of the ship, the water from the sea can be taken by the pump.
  • true
  • false
Answer: true
Q7 | Jet propulsion of ship is less efficient than screw propeller due to               
  • pressure
  • temperature
  • frictional losses
  • wear and tear
Answer: frictional losses
Q8 | A jet strikes a curved plate at its              
  • sides
  • surface
  • centre
  • does not strike
Answer: centre
Q9 | Which among the following is not a type of jet engine?
  • turbojet
  • ramjet
  • scramjet
  • propulsive jet
Answer: propulsive jet
Q10 | The fluid gains                    while passing through the impeller.
  • velocity
  • pressure
  • temperature
  • velocity and pressure
Answer: velocity and pressure
Q11 | What is the shape of the diffuser in the centrifugal pump?
  • round
  • dough nut
  • rectangle
  • cylindrical
Answer: dough nut
Q12 | When the casing in a centrifugal pump decelerates the flow, what increases?
  • pressure
  • temperature
  • volume
  • flow rate
Answer: pressure
Q13 | The velocity imparted by the impeller is converted into                    
  • pressure energy
  • kinetic energy
  • momentum
  • potential energy
Answer: pressure energy
Q14 | The consequence of Newtons second law is                   
  • conservation of angular momentum
  • conservation of mass
  • conservation of potential energy
  • conservation of kinetic energy
Answer: conservation of angular momentum
Q15 | Euler developed the head pressure equation in centrifugal pumps.
  • true
  • false
Answer: true
Q16 | What is a major advantage of centrifugal pump?
  • cost
  • simple in construction
  • efficiency
  • pump parameters
Answer: simple in construction
Q17 | Different velocities in a centrifugal pump are determined by using                  
  • velocity triangle
  • reynolds number
  • froude number
  • overall efficiency
Answer: velocity triangle
Q18 | Due to its impeller action, centrifugal pumps can cover a wide range of fluid pump applications.
  • true
  • false
Answer: true
Q19 | With the increase in the input power, efficiency                
  • increases
  • decreases
  • same
  • independent
Answer: decreases
Q20 | What is unit of standard acceleration?
  • kg/m
  • kg/s
  • kg/m3
  • n/m
Answer: kg/m3
Q21 | Turbomachines work under                  
  • newtons first law
  • newtons second law
  • newtons third law
  • kepler’s law
Answer: newtons second law
Q22 | The main function of nozzle is to
  • pump start procedure                      
  • positive start pump
  • pump start pointer
  • positive start pointer
Answer: pump start procedure                      
Q23 | The main function of centrifugal pumps are to                  
  • transfer speed
  • transfer pressure
  • transfer temperature
  • transfer energy
Answer: transfer energy
Q24 | Centrifugal pumps transfer energy from
  • rotor to fluid
  • fluid to rotor
  • draft to rotor
  • rotor to draft
Answer: rotor to fluid
Q25 | The inlet passage of water entry is controlled by                  
  • head race
  • gate
  • tail race
  • pump
Answer: gate
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