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.
20
60
120
∞
- One face of a furnace wall is at 1030°C and the other face is exposed to room temperature (30°C).…
- Thermit welding uses the following energy source.
- Which of the following does not discharge the dust collected as a dry solid?
- An ideal material for making cooking vessels should have
- The ratio of the shear stress to the principal stress on a principal plane is
- Which of the following metals is the most prone to work hardening?
- Thermal equivalent of electrical power in practical calculation is __________ kcal/kWh.
- The property of material, by which a given amount of energy is absorbed by it without plastic deformation,…
- Yield strength of a material is determined by the __________ test.
- Frother is added in the froth floatation cell used in ore beneficiation to stabilise the air bubbles…
- Ammonia leakage in the refrigeration system is detected by
- The 'transition temperature' for ductile to brittle behaviour of steel increases with increase in the…
- In the diving apparatus, helium is used along with oxygen, because it is
- Out of the following, the __________ pipe has the least corrosion resistance.
- Pick out the wrong statement.
- With decrease in the grain size of a material, its creep resistance
- Heat flow across a hollow sphere of inner radius 'r1' and outer radius 'r2' is directly proportional…
- Which of the following is an example of cathodic protection of metals against corrosion?
- 'Amortization' in respect of financial obligation of a company means the
- About __________ ton of coke is required in a cupola to produce one ton of casting.
- Minimum safe distance between two liquid fuel storage tanks is equal to (where, H = height of the tank)
- Heat transfer by __________ is almost absent in case of fluidised bed drying operation.
- The usual energy consumption in electric arc furnace steel making is __________ KWh/ton of steel.
- In a good rimming steel
- In a boundary layer developed along the flow, the pressure decreases in the downstream direction. The…
- Temper brittleness of a material can be fairly detected by the __________ test.
- Which of the following test is used for distinguishing among dry oils, semi-drying oils and non drying…
- The order of a chemical reaction
- Fatigue limit improvement by over stressing the metal by successively increasing the load is called…
- Metal shots used in shot blasting are made of