Exhaust pipes of engines are covered with insulating marterial in order to_________________?

Related Mcqs:

1. Diesel engines as compared to petrol engines require ______________________?

   A. bigger flywheel
   B. smaller flywheel
   C. same size flywheel
   D. no flywheel
   E. flywheel whose size may be less or more depending on several other fac-tors

2. Compression loss in I.C engines occurs due to_________________?

   A. leaking piston rings
   B. use of thick head gasket
   C. clogged air-inlet slots
   D. increase in clearance volume caused b bearing-bushing wear
   E. all of the above

3. The ratio of useful power; engine friction exhaust gas losses; cooling water, air and oil losses for a diesel engine is of the order of____________________?

   A. 5:25:30:50
   B. 25:35:5:35
   C. 25:5:10:60
   D. 40:30:15:15
   E. 25:5:35:35

4. Lead is poured into the joint between two pipes. These pipes may be made of____________________?

   A. cast iron
   B. vitrified clay
   C. asbestos cement
   D. concrete
   E. mild steel

5. In order to prevent knock in the S.I. engines, the charge away from the spark plug should have___________________?

   A. low temperature
   B. low density
   C. long ignition delay
   D. rich mixture
   E. all of the above

6. The efficiency of I.C. engines normally is of the order of_________________?

   A. 15-20%
   B. 20-25%
   C. 25-30%
   D. 30-35%
   E. 35-50%

7. The ignition coil in diesel engines produces voltage of the order of________________?

   A. 6 to 12 volts
   B. 240 volts
   C. 1000 volts
   D. 20,000 volts
   E. 80,000 volts

8. In the case of petrol engine at maximum output, the percentage of CO in exhaust gases is ____________________?

   A. Zero
   B. 5-10%
   C. Depends on load and quality of fuel
   D. Considerable percent

9. In the case of compression ignition engine, the %age of CO in exhaust gases is________________?

   A. Zero
   B. 5-10%
   C. Depends on load
   D. Considerable percent

10. The size of inlet valve of.an engine in comparison to exhaust valve is_________________?

    A. more
    B. less
    C. same
    D. more/less depending on capacity of engine
    E. varies from design to design