Set 1 - MEK Motor important questions from E Pariksha online exam for MEO class 4 exam

1. When fuel is injected late into a diesel engine cylinder,
choose one the exhaust will be clear fuel consumption will be low all the fuel will be burned at top dead center fuel consumption will be high

2. As a thumb rule, ovality in crankpins of medium speed engines should not exceed _____________ of bearing clearance.
choose one 10% 15% 25% 30%

3. On small diesel engines, a noticeable decrease in the time interval between the replacement of the lube filter cartridge indicates –
choose one piston ring blow-by dirty air filter excessive oil pressure excessive oil temperature

4. Modern marine turbochargers use a ___________ type of compressor
choose one Radial flow Axial flow Mixed flow Turbulent flow

5. During inspection of the crank bearing for one of the units in the main engine, the bearing shell was found as follows: Surface of the white metal was black and very hard. Patches of black incrustations have worn grooves in the journal. What was the cause?
choose one Dirt in the lubricating oil Wrong casting of bearing shell Water in the lubricating oil during service Bearing shell service time exceeded

6. A large change in ambient temperature, or using an oil of a viscosity different than the one recommended by the manufacturer in a mechanical hydraulic governor, will result in the need to adjust the
choose one pilot valve opening compensating needle valve Droop oil pressure

7. Fuel oil penetration into the cylinder of a diesel engine is
choose one dependent on air turbulence reduced by finer atomization increased by finer atomization non-existent in the precombustion chamber system

8. An individual injection pump is designed for variable beginning and constant ending of injection. For diesel engines operating at constant speeds, the start of injection will
choose one advance as the load increases retard as the load increases remain unchanged regardless of load always occur at top dead center

9. The amount of fuel injected in a particular time, or degree, of crankshaft rotation is termed
choose one metering timing rate of injection rate of distribution

10. In a diesel engine, late fuel injection is indicated by black or gray exhaust smoke with ______________.
choose one low firing pressure low exhaust temperature mechanical knock in each cylinder fuel knock in each cylinder

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