Diploma Thermal and Automobile Engineering Board Exam Answer Key – Unit 5

Diploma Thermal and Automobile Engineering Board Exam Answer Key

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Subject : Thermal & Automobile Engineering         Scheme : M

Unit- 5, AUTOMOBILE BRAKE SYSTEM, ELECTRICAL EQUIPMENT AND POLLUTION CONTROL

NOTE :

1. The highlighted Questions are asked more than two times in the Board Exam

1. These Questions are collected from Board Examination Question Papers.

2/3 marks questions

1. State any two troubles in ignition system and remedies for them

Troubles	Cause	Remedy
Engine runs but misses cylinder	(A)    Defective Spark plug	Clean or replace
	(B)     Distributor Cap or lead cap defective	Replace
Engine lacks power	(A)     Timing off	Retime Ignition
	(B)     Exhaust system clogged	Clean
	(C)      Excessive Rolling	Check tyres, brakes, wheel bearings and alignment

2. List the important components of lighting system.

The lighting system of a motor vehicle consists of lighting and signalling devices mounted on the front, rear, sides, and in some cases on the top of a motor vehicle, and lights the roadway for the driver

Vehicle Lighting Components include:
Bulbs/Globes Lamp Mouldings Light Cases LED Bars Headlamps	Indicator Lamps Marker Lamps Tail Lamps Corner Lamps Fog/spot Lamps

 

3. Mention the causes of spongy brake.

The causes of spongy brake are

• Air in lines
• Improper Brake shoe adjustment
• Brake drum out of round

 

4. Enumerate the different tests ascertaining the condition of a battery.

There are three different tests ascertaining the condition of a battery

• Hydrometer test
• High rate discharge test
• Cadmium test

5.Explain the PCV system with a neat sketch

PCV means Positive Crank case ventilation system. This PCV system is used for preventing air pollution. In this system filtered air from the cleaner is drawn through the crank case from where it picks up blow by gases, fuel vapours and water. The air then flows back to the induction manifold through a PCV Valve and enters the engine where the unburnt fuel is burnt

6. Mention the types of starting motor devices

The main types of starting motor devices are

1. Bendix drive
   1. Standard bendix drive
   2. Folo-thru Bendix drive
   3. Compression spring type Bendix drive
   4. Rubber spring type bendix drive

 

2. Over running clutch or the pre engaged type drive
3. Dyer drive

 

7. List the major parts of a battery coil ignition system

The Major Parts of a battery coil ignition system are a battery, ignition coil, condenser, contact breaker, distributor and spark plugs

8. Name the tests carried out in a battery (repeated question)

There are three different tests ascertaining the condition of a battery

• Hydrometer test
• High rate discharge test
• Cadmium test

9. State two troubles in ignition system and their causes. (repeated question)

Troubles	Cause	Remedy
Engine runs but misses cylinder	(C)     Defective Spark plug	Clean or replace
	(D)    Distributor Cap or lead cap defective	Replace
Engine lacks power	(D)     Timing off	Retime Ignition
	(E)     Exhaust system clogged	Clean
	(F)       Excessive Rolling	Check tyres, brakes, wheel bearings and alignment

 

10. What is CCA?

CCA is known as Cold Cranking Amperes (CCA). CCA is the product of current delivered continuously for 30 seconds without the cell voltage falling below 1.2V at 18^o C or 0^oF

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