APM - Module 1 Quiz

The air standard efficiency of an otto cycle compared to diesel cycle for same compression ratio is

• Less

• Same

• More

• Unpredictable

An engine gives power output of 3kW when input is 10000 J/s. Thermal efficiency of engine is

• 33%

• 30%

• 60%

• 66.66%

If cylinder bore is greater than stroke length, then the engine is called

• Square engine

• Under Square engine

• Over Square engine

• Transverse engine

In Fuel-Air cycle analysis, the specific heat is

• Constant

• Function of pressure

• Function of no. of moles

• Function of temperature

With increase in engine speed, the ignition advance must be

• Constant

• Decreased

• Increased

• Stable

No of sparks required per min at 1000 rpm for a 2 cylinder engine will be

• 1000

• 2000

• 500

• 250

Which stage of combustion is responsible for maximum power development

• Ignition lag stage

• Flame propagation stage

• After burning stage

• All the stages

Which ignition system suffers from a major drawback of low emf at low rpm

• Battery coil ignition

  
  

• Magneto ignition

  
  

• TCI ignition system

• CDI ignition system

Which sensor in MPFI system is responsible for sensing load on engine

• Engine coolant temperature sensor

• Oxygen sensor

  
  

• Lamda sensor

  
  

• MAP sensor

  
  

Which property of petrol governs the combustion quality in SI Engines ?

• Density

  
  

• Viscocity

• Octane number

  
  

• Cetane number