Previous year question paper for AES (B-TECH automobile engineering 5th)

Introduction

Earth returns and insulated return systems, 6, 12, and 24-volt systems. Positive & negative earth systems.

Fusing of circuits, relays, switches, low and high voltage automotive cables, wiring diagram for typical automotive

wiring systems, maintenance and servicing.

Batteries

Principles of lead acid cells and their characteristics - construction and working of lead acid battery, types of

batteries, testing of batteries, effect of temperature on: capacity and voltage, battery capacity, voltage, efficiency,

charging of batteries, sulphation and desulphation, maintenance and servicing, Battery failures & checking,

Maintenance free Batteries, High energy and power density batteries for electric vehicles.

Charging system

Principle of generation of direct current. Shunt generator characteristics. Armature reaction. Third brush

regulation. Cut-out. Voltage & current regulators, compensated voltage regulator. Alternators - principle,

constructional and working aspects, bridge rectifiers. Principle of Magneto, Flywheel Magneto, Maintenance and

servicing. Trouble shooting in charging systems.

Starting system

Condition at Starting – starting torque and power requirements, behavior of starter during starting. Series motor

and its characteristics. Principle & construction of starter motor. Working of different starter drive units, care &

maintenance of starter motor. Starter switches. Safety mechanism. Maintenance, servicing and trouble shooting.

Ignition system

Types, construction & working of battery & coil and magneto ignition systems. Relative merits, Ballast Resistor,

Ignition coil, Distributor, Contact breaker Point, centrifugal and vacuum advance mechanisms, Limitations of

conventional ignition systems, Transistorized Ignition systems, Spark plugs - construction, different types, plug

fouling, maintenance, servicing and fault diagnosis, Electronic Ignition system. Programmed ignition, distributor

less ignition.

Lighting system

Principle of automobile illumination, headlamp construction and wiring, reflectors – types, signaling devicesflashers,

stop lights, fog lamps, auxiliary lighting-engine, passenger, reading lamp. Regn-plate lamps. Automatic

illumination system. Head light levelling devices. Study of a modern headlight system with improved night vision.

Electrical Equipment and Accessories

Oil pressure gauge, fuel level gauge, engine temperature gauge, electrical fuel pump, speedometer, odometer,

trip meter, engine rpm meter, Headlamp & Windshield washer and wiper, heaters and defrosters, horns,

stereo/radio, power antennae. Central locking, power window winding. Sun/Moon Roof. Motorized rear view

mirrors, reverse warning, Bumper collision warning. Other accessories in modern vehicles.

Fuel Cells

Thermodynamic aspects; types-hydrogen and methanol, power rating and performance. Various components

and working of fuel cell. Heat dissipation.

Drive Motors and controllers:

Drive arrangements in Hybrid and Electric vehicles. Drive motors: types and construction. Controlling of motor

operations. Motor-generator in hybrid vehicles and its controls.