Test: Fuel Injection, Ignition & Carburetor of IC Engine - 2


10 Questions MCQ Test Topicwise Question Bank for Mechanical Engineering | Test: Fuel Injection, Ignition & Carburetor of IC Engine - 2


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QUESTION: 1

Consider the following statements:
1. Petrol engines are quantity governed.
2. SI engine combustion is heteroge-neous.
3. Lean mixturer is required during idling.
4. Choke supplies rich mixture for cold starting.
5. Stoichiometric AJFratio for IC engine fuels is about 18.

Which of these are correct statements ?

Solution:

Combustion in SI engine is homogeneous
Rich mixture is required during idling
Stoichiometric A/F ratio for 1C engine fuels is about 15.

QUESTION: 2

Consider the following statements for a multijet carburettor:
1. Acceleration jet is located just behind the throttle valve.
2. Main jet alone supplies petrol at normal range of engine speed.
3. It has higher volumetric efficiency.
4. it has robust design.

Which of these statements are correct ?

Solution:

Following are the advantages of multijet carburettors:

  • Uniform quality of supply mixture.
  • Higher volumetric efficiency.
  • Even distribution of charge.
  • Compact in its design.
QUESTION: 3

Modern carburettors provide the correct quality of air-fuei mixture during

Solution:
QUESTION: 4

Which among following additional systems is not added to simple carburettor to make a complete carburetor ?

Solution:

Following additional systems are added:

  • Main metering system. 
  • idling system.
  • Power enrichment by economiser system.
  •  Acceleration pump system.
  • Choke.
  • Throttle valve is common.
QUESTION: 5

Economiser is used to provide enriched mixture during

Solution:

An economiser is a valve which remains closed at normal cruise operation and gets opened to supply rich mixture at full throttle operation. It regulates the additional fuel supply during the full throttle operation.

QUESTION: 6

An SI engine sometimes continues to run for a very small period even after the ignition is switched off. This phenomenon is called

Solution:

An Si engine sometimes continues to run for a very small even after the ignition is switched off. It is called as dieseiing. Dieseling may take place due to following:

  • High engine idling speed.
  • Increase in compression ratio due to carbon deposits.
  • Engine overheating.
  • Too high spark plug heat range,
  • Incorrect adjustment of idle fuel-air mixture.
  • Sticking of throttle. 
  • Requirement of tune up of engine.
  • Oil entry into the cylinder.
QUESTION: 7

The mass flow rate of air at venturi throat is given by 

Subscript 1 refers to inlet condition and 2 refers to throat condition φ is given by

(All symbols have usual standard meaning)

Solution:

QUESTION: 8

A / F ratio of a simple carburettor neglecting compressibility of air is given by
(All notations have usual meaning)

Solution:

where z is the height of nozzle exit above the level of fuel in the float bowl.

QUESTION: 9

Precise petrol injection system is

Solution:
QUESTION: 10

Petrol injection system have following advantages except

Solution: