The bank of tubes located at the back of the domestic refrigerators are the _______________ tubes?

Related Mcqs:

1. Steam condenser tubes are made of admiralty brass, in which percentage of zinc & copper are _______________ respectively ?

   A. 70 & 30
   B. 30 & 70
   C. 50 & 50
   D. 90 & 10

2. The most prominent single cause of corrosion in boiler-tubes, drums, economisers and steam superheaters in a thermal power plant boiler is the_______________?

   A. Water alkalinity & leakage
   B. Hydrazine addition during feed water treatment
   C. Release of non-condensable gas from water in the boiler
   D. Scale formation

3. Coating thickness in case of galvanising of steel sheet generally corresponds to the deposition of _______________ gms of zinc per m2 of steel strip ?

   A. 5-10
   B. 1000-1500
   C. 120-500
   D. 1500-3000

4. According to maximum shear stress failure criterion, yielding in material occurs, when the maximum shear stress is equal to _______________ times the yield stress ?

   A. 0.5
   B. 2
   C. √2
   D. √3/2

5. Strain hardening effect in metals subjected to cold working is due to the _______________ mechanism?

   A. Slip
   B. Fracture
   C. Winning
   D. Dislocation

6. _______________ number determines whether the fluid flow in an open channel is super-critical, critical or sub-critical ?

   A. Mach
   B. Reynolds
   C. Froude
   D. Weber

7. The approximate height of a blast furnace having a useful volume of 2000 m3 is about _______________ metres ?

   A. 25
   B. 35
   C. 55
   D. 75

8. High relative humidity decreases the evaporative process and as the temperature is increased, the relative humidity decreases. The comfort range for human body is the ambient temperature of 22 to 27°C with relative humidity ranging from _______________ percent ?

   A. 5 to 10
   B. 15 to 25
   C. 45 to 50
   D. 75 to 80

9. In a boundary layer developed along the flow, the pressure decreases in the downstream direction. The boundary layer thickness in this case will _______________?

   A. Decrease gradually
   B. Increase gradually
   C. Increase rapidly
   D. Remain constant

10. Steel produced from phosphatic iron is _______________ in nature?

    A. Malleable
    B. Ductile
    C. Brittle
    D. Tough