At very low temperature, the melting and boiling temperatures become equal. This temperature is____________________?

Related Mcqs:

1. Diesel engines have low specific fuel consumption compared to petrol engine. This statement is____________________?

   A. not true
   B. true at full load
   C. true at part load
   D. true at both part and full load
   E. there could not be any such criterion

2. Auto-ignition temperature is____________________?

   A. minimum temperature to which oil is heated in order to give off inflammable vapours in sufficient quantity to ignite momentarily when brought in contact with a flame
   B. temperature at which it solidifies or congeals
   C. that at which it catches fire without external aid
   D. indicated by 90% distillation temperature, i.e., when 90% of sample oil has distilled off
   E. indicated by 50% distillation temperature

3. Melting point of iron is__________________?

   A. 1539°C
   B. 1601°C
   C. 1489°C
   D. 1712°C
   E. 1131°C

4. The value of the coefficient of compressibility for water at ordinary pressure and temperature in kg/cm is equal to_________________?

   A. 1000
   B. 2100
   C. 2700
   D. 10,000
   E. 21,000

5. The alloy used for making electrical resistances and heating elements is____________________?

   A. nichrome
   B. invar
   C. magnin
   D. elinvar
   E. peiminvar

6. A square surface 3 m x 3 m lies in a vertical line in water pipe its upper edge at water surface. The hydrostatic force on square surface is____________________?

   A. 9,000 kg
   B. 13,500 kg
   C. 18,000 kg
   D. 27,000 kg
   E. 30,000 kg

7. The depth of the center of pressure on a vertical rectangular gate 8 m wide and 6 m high, when the water surface coincides with the top of the gate, is____________________?

   A. 2.4 m
   B. 3.0 m
   C. 4.0 m
   D. ”2.5 m
   E. 5.0 m

8. At which pressure the properties of water and steam become identical_________________?

   A. 0.1 kg/cm2
   B. 1 kg/cm2
   C. 100 kg/cm2
   D. 225.6 kg/cm2
   E. it is never possible

9. The dry saturated steam at very low pressure, (5-10 kg/cm2) when throttled to atmosphere will become________________?

   A. wet
   B. superheated
   C. remain dry satruated
   D. dry
   E. none of the above

10. Expanding steam to a very low pressure (high vacuum) in steam engines is _________________?

    A. desirable
    B. economical
    C. essential
    D. optional
    E. uneconomical