Basics of Mechanical Engineering

LATEST

MCQ ~ Internal Combustion Engines

1. In a four stroke engine, the working cycle is completed in
  • One revolution of the crankshaft
  • Two revolutions of the crankshaft
  • Three revolutions of the crankshaft
  • Four revolutions of the crankshaft
2. A two stroke cycle engine gives ............... the number of power strokes as compared to the four stroke cycle engine, at the same speed.
  • Half
  • Same
  • Double
  • Four times
3. The thermal efficiency of a two stroke cycle engine is .......... a four stroke cycle engine.
  • Equal to
  • Less than
  • Greater than
4. The theoretically correct mixture of air and petrol is
  • 10:1
  • 15:1
  • 20:1
  • 25:1
5. The thermodynamic cycle on which the petrol engine works, is
  • Otto cycle
  • Joule cycle
  • Rankine cycle
  • Diesel cycle
6. A diesel engine has 
  • One valve
  • Two valves
  • Three valves
  • Four valves
7. If petrol is used in a diesel engine, then
  • Low power will be produced
  • Efficiency will be low
  • Higher knocking will occur
  • Black smoke will be produced
8. A petrol engine has compression ratio from
  • 6 to 10
  • 10 to 15
  • 15 to 25
  • 25 to 40
 9. The function of a distributor in a coil ignition system of I.C engines is
  • To distribute the spark
  • To distribute the power
  • To distribute the current
  • To time the spark
10. Supercharging ................ the power developed by the engine.
  • Has no effect on
  • Increases
  • Decreases
11. A carburetor is used to supply  
  • Petrol, air and lubricating oil
  • Air and diesel
  • Petrol and lubricating oil
  • Petrol and air
12. A spark plug gap is kept from
  • 0.3 to 0.7 mm
  • 0.2 to 0.8 mm
  • 0.4 to 0.9 mm
  • 0.6 to 1.0 mm
13. The knocking tendency in spark ignition engines may be decreases by
  • Controlling the air fuel mixture
  • Controlling the ignition timing
  • Reducing the compression ratio
  • All of these
14. The violent sound pulsations within the cylinder of an I.C engine are due to
  • Detonation
  • Turbulence
  • Pre-ignition
  • None of these
15Which of the  following does not relate to a spark ignition engine?
  • Ignition coil
  • Spark plug
  • Distributor
  • Fuel injector

No comments:

Post a Comment

Powered by Blogger.