Compressed dry air is used as the cutting fluid, while machining____________________?

Related Mcqs:

1. If a solid is compressed adiabatically in its elastic range, its _____________ remains constant ?

   A. Internal energy
   B. Enthalpy
   C. Entropy
   D. Temperature

2. Moist air is cooled along the line of constant ________________ , when it is passed over a cold & dry cooling coil, such that no condensation occurs ?

   A. Enthalpy
   B. Relative humidity
   C. Wet bulb temperature
   D. Dew point temperature

3. Percentage of argon (by volume) in dry atmospheric air is about________________?

   A. 0.09
   B. 0.3
   C. 0.57
   D. 0.94

4. When dry bulb temperature & wet bulb temperature of moist air is the same, it means that the _________________?

   A. Partial pressure of water vapour is less than the total pressure
   B. Humidity is < 100% & dew point temperature of air has not reached
   C. Dew point temperature of air has not reached & air is not saturated fully
   D. Air is fully saturated

5. Gage pressure within a spherical droplet of a fluid is ‘p’. What will be gage pressure within a bubble of the same size & of the same fluid ?

   A. p
   B. 2 p
   C. 0.5 p
   D. 0.25 p

6. A fluid is termed as the Newtonian fluid, when the shear stress is _________________ the velocity gradient ?

   A. Independent of
   B. Inversely proportional to
   C. Directly proportional to
   D. None of these

7. In a counter flow heat exchanger, hot fluid enters at 170°C & leaves at 150°C, while the cold fluid enters at 50°C & leaves at 70°C. The arithmetic mean temperature difference in this case is ______________ °C?

   A. 20
   B. 60
   C. 120
   D. ∞

8. Reynolds number of a fluid flowing in a circular pipe is 10,000. What will be the Reynolds number when the fluid velocity is decreased by 30% & the pipe diameter is increased by 30% ?

   A. 9,100
   B. 13,000
   C. 7,000
   D. 2,550

9. Carbide tipped cutting tools are manufactured by powder metallurgy techniques and have a composition of_____________________?

   A. 90% tungsten carbide and 10% cobalt
   B. 70% aluminium oxide & 30% silica
   C. 30% nickel, 15% chromium & 55% tungsten
   D. 65% tungsten & 35% zirconium

10. Highest cutting speed is achieved by the _______________ tool material ?

    A. High speed steel
    B. Carbide
    C. Cast alloy
    D. Plain carbon steel