Set 26 - MEK Motor multiple choice online exam questions

1. What ensures correction axial location of a thin shell bearing in its housing, for correct alignment of the oil holes ?
choose one The nip or crush of the bearing Location tangs or pegs Dowels or keys None of the above

2. Economisers are built up with
choose one Copper tubes Plain steel tubes Stainless steel tubes Steel tubes fitted with shrunk on C.I. grills

3. Constant pressure turbocharging is ______________ efficient compared to that of pulse pressure turbocharging .
choose one Equally Less Slightly More Very highly

4. Only a pre determined fixed amount of water should be used during:
choose one Water washing of the turbine side of a turbocharger Water washing of the blower side of a turbocharger Water washing of both blower and turbine sides of a turbocharger. Exhaust gas boiler water washing

5. A non water-cooled turbocharger offers which of the following advantages?
choose one More heat is available for waste heat boilers Corrosion problems of internal surfaces due to formation of sulfuric acid are eliminated Improved thermal efficiency of turbocharger All of the above

6. Post Nox emission test bed trial and approval of an engine, periodic Nox emission limit verification is normally done by:
choose one Emission tests at regular intervals Engine parameters/settings check method By running the engine at full load and sending a sample of exhaust gas for analysis None of the above

7. An auxiliary engine under load continuously fluctuates even with a steady load. The fault you diagnose could be owing to
choose one the quality of fuel the quality of servicing of the governor in the last port. the supply of charge air the overhaul of fuel injectors done in the last decarbonisation

8. Which of the following factors affect penetration of fuel droplets during injection?
choose one Quality of atomization Injection temperature Scavenge air pressure All the above

9. Which of the following is the primary advantage of supercharging the air quantity in a diesel engine, by means of a turbocharger?
choose one It leads to considerable gain in thermal efficiency. It increases the maximum pressure generated in a cylinder appreciably. It improves the power to weight ratio of the engine All of the above.

10. The maximum amount of liner wear occurs at—
choose one top of liner 1/ 3 downward from top centre midway bottom of liner

Score =
Correct answers: