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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