Thermal Engineering II Set 16

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This set of Thermal Engineering 2 Multiple Choice Questions & Answers (MCQs) focuses on Thermal Engineering II Set 16

Q1 | Compressible flow mainly deals with
  • solid dynamics
  • liquid dynamics
  • gas dynamics
  • solid and liquid dynamics
Q2 | The coefficient of kinetic friction is less than the coefficient of static friction.
  • true
  • false
Q3 | Which among the following is an assumption of the compressible flow?
  • resistance to flow of object
  • no-slip condition
  • known mass flow rate
  • resistance to flow of heat
Q4 | What is Mach number?
  • speed of object * speed of sound
  • speed of object /speed of sound
  • speed of object + speed of sound
  • speed of object- speed of sound
Q5 | Which of the following kinetic friction is smaller?
  • limiting friction
  • static friction
  • rolling friction
  • sliding friction
Q6 | A cubical block rests on an inclined plane of μ = 1/√3, determine the angle of inclination when the block just slides down the inclined plane?
  • 40°
  • 50°
  • 30°
  • 20°
Q7 | A mass of 4kg rests on a horizontal plane. The plane is gradually inclined until at an angle θ= 15° with the horizontal, the mass just begins to slide. What is the coefficient of static friction between the block and the surface?
  • 0.814
  • 0.27
  • 1.5
  • 3.5
Q8 | A scooter weighs 120kg f. Brakes are applied so that wheels stop rolling and start skidding. Find the force of friction if the coefficient of friction is 0.4.
  • 60kg f
  • 48kg f
  • 25kg f
  • 32kg f
Q9 | How is friction due to air reduced?
  • streamlining
  • lubrication
  • by using ball bearings
  • by polishing
Q10 | Friction can be increased by                        
  • using air cushion
  • lubricants
  • using sand
  • using ball bearings
Q11 | When moving along a curved path, he
  • leans inwards
  • leans outwards
  • is still
  • leans sideways
Q12 | When a gas is pushed through a pipe, the gaseous molecules are                    by the pipe’s walls
  • attracted
  • absorbed
  • deflected
  • dissipated
Q13 | In fluid dynamics, the velocity of the fluid in the stagnation point is
  • zero
  • infinite
  • non-existent
  • negative
Q14 | If the speed of sound is much                   than that of the gas, the gas density will stay constant.
  • smaller
  • larger
  • equal to
  • non-existent
Q15 | Isentropic nozzle flow states about the movement of a gas or fluid through a narrow orifice without an increase or decrease in
  • accelerating
  • decelerating
  • equilibrium
  • exponential increase
Q16 | To refrain from separation in subsonic nozzles, the expansion angle must not be more than            
  • 10 degrees
  • 20 degrees
  • 30 degrees
  • 40 degrees
Q17 | Gas flows through the nozzle from an area of            pressure (called the chamber) to one of            pressure
  • high, low
  • low, high
  • same, same
  • constant, infinite
Q18 | Converging-diverging nozzle is also known as                      
  • pascal nozzle
  • bernouille’s nozzle
  • toricelli’s nozzle
  • de laval’ nozzle
Q19 | When the pressure chamber is big, the flow velocities are                    
  • large
  • negligible
  • constant
  • increasing
Q20 | For a compressible, ideal gas, mass flow rate depends on parameters such as flow area, pressure, temperature, properties of the gas, and                    
  • avogardo’s number
  • mach number
  • reynold’s number
  • le-grange’ number
Q21 | On what basis are fire and water tube boilers are classified?
  • depending the combustion products formed
  • depending the state of fuel
  • depending on the steam formation rate
  • depending tubular heating surface
Q22 | Stirling boiler is an example of which type of boiler?
  • inclined tube boilers
  • mobile boiler
  • fire tube boiler
  • water tube boiler
Q23 | Which of these is a stationary boiler?
  • locomotive boiler
  • marine boiler
  • mobile boiler
  • babcock-wilcox boiler
Q24 | Which of these is a mobile boiler?
  • lancashire boiler
  • stirling boiler
  • locomotive boiler
  • cochran boiler
Q25 | Are boilers defined on the basis of heat source.
  • yes
  • no