MVM CBA 2018

MVM CBA 2018
1. (a)What is an automatic gearbox
(b)Mention the  lubricant used in automatic gearbox  (ATF)
(c)Differentiate between the Manual gearbox and semi automatic gearbox
(d)Briefly explain the main purpose of transfer  gearbox in the transmission system

2. (a)What is torque conveter in automatic transmission of modern vehicle
(b).Epicyclic gears and special set of gear are part of most automatic gearbox  name three (3) of them
(c).With aid of adiagram explain how the torque conveter works in the automatic gearbox

3. (a)List three (3) system that are designed to increase branking ability of the vehicle
(b).What is the  function of brake booster on the brake system
(c).Explain the three (3) basic part of drum brake assembly
(d).Draw the tandem brake master cylinder indicating its  main parts

4.(a)Mention four (4) main parts of disc brakes
(b).Describe the procedures used to remove bubbles in hydraulic brake  system
(c).Briefly explain what will happen if the brakes of one side  of the  vehicle are free.
(d).Distinguish between  heading shoe  and traiting shoe of the  brake.

5. (a)What is the  function  of sensor in the moder vehicles?
(b).Sensor can  be grouped  into two (2) main classes name  them.
(c).With the  help  of agood and dearblock diargram show simple electronic contral unit with  sensor and  actuators
(d).Briefly explain about actuators as a component used in modern vehicles

6. (a)Define the term "stoke"
(b)Differentiate between spark ignition (si) and  compression ignition
(c).Identify three (3) types of engine cylinders arrangements
(d).The engine drives comshaft in three  ways ,name them

7. (a).Differentiate between  valve timing and ignition timing or internal combustion engine
(b).What are  the  possible causes of engine troubles when  the following symtoms are observed.
           i/.Engine does not  rotate when trying  to rotate
ii/.Engine rotates but does not start
iii/Difficult to start when cold
iv/.Lack  of power
v/.Back fires
(c).State five (5) main component inthe electronic  fuel injection system (petrol engine)
(d).Mention two (2) types of petrol fuel pump and where they are mounted