If a refractory contains high content of silicon, it means refractory is__________________?

Related Mcqs:

1. An important property of high silicon (12 – 18%) cast iron is the high__________________?

   A. tenacity
   B. brittleness
   C. plasticity
   D. corrosion resistance
   E. hardness

2. One kg of steam sample contains 0.8 kg dry steam; it’s dryness fraction is__________________?

   A. 0.2
   B. 0.8
   C. 1.0
   D. 0.6
   E. 0.5

3. Addition of silicon to aluminium results in____________________?

   A. improvement of casting characteristics
   B. improvement of corrosion resistance
   C. one of the best known age and precipitation-hardening systems
   D. improving machinability
   E. none of the above

4. High carbon content in diesel oil used for diesel engine leads to_________________?

   A. production of highly corrosive gases corroding the cylinder walls and exhaust system
   B. excessive engine wear
   C. damaging of both the storage tank and the engine
   D. deposition on engine parts
   E. none of the above.

5. Which of the following solid fuel has high carbon content?

   A. Coke
   B. Coal
   C. Peat
   D. None of these

   Submitted by: Faheem Zaman Dhaunroo

6. Scavenging air is supplied to a two-stroke engine at a density greater than that of atmosphere. This means the engine is__________________?

   A. Supercharged
   B. Not supercharged
   C. Charged
   D. Supercharged provided its speed is low

7. Isothermal compression efficiency, even when running at high speed, can be approached by using A. multi-stage compression B. cold water spray C. both A. and B. above D. fully insulating the cylinder E. high stroke_________________?

   Isothermal compression efficiency, even when running at high speed, can be approached by using
   A. multi-stage compression
   B. cold water spray
   C. both A. and B. above
   D. fully insulating the cylinder
   E. high stroke

8. White cast iron contains carbon in the form of__________________?

   A. free carbon
   B. graphite
   C. cementite
   D. white carbon
   E. ferrite

9. Eutectoid steel contains following percentage of carbon_______________?

   A. 0.02%
   B. 0.3%
   C. 0.63%
   D. 0.8%
   E. 1.2%.

10. Corrundum contains more than 95% _____________________?

    A. steel
    B. A1203
    C. Si02
    D. MgO
    E. german silver