a. The term MPFI (Multi-Point Fuel Injection) is used in petrol engines.
b. Two-stroke diesel engines are used in large marine engines or stationary power generation units
(though rarely in modern vehicles).
c. Increase in torque in a vehicle is obtained by using gear reduction (lower gear ratio) or
turbocharging.
d. The central gear of an epicyclic gear set is called a sun gear.
e. The type of rear axle on trucks is full floating axle.
f. Most anti-skid devices are employed on braking systems (commonly known as ABS Anti-lock
Braking System).
g. During braking, the push rod directly operates the master cylinder.
h. The positive plate of a lead acid battery is made of lead dioxide (PbO2).
i. Automobile horns are electromagnetic devices.
j. Turning cycle for a car is approximately 9 to 11 meters.
k. Davis steering gear has sliding pairs.
l. The distance between the front wheels is called front track width.
m. The clutch is located between the transmission and engine.
n. Kingpin inclination is the angle between the vertical and kingpin centerline (viewed from the front
of the vehicle).
o. Ackermann steering gear has four bar linkage.
(i) The term MPFI is used in petrol engine.
(ii) Universal joint is used for connecting a propeller shaft.
(iii) In the cone clutch, there are two cones a male cone and a female cone.
(iv) Davis steering gear has sliding pairs, whereas Ackermann steering gear has turning pairs.
(v) The brake bleeding process removes air from the system.
(vi) Another name for a torsion bar is torque bar.
(vii) Shock absorber in an automobile is used to dampen the vibrations and absorb shocks.
(viii) Specific gravity of electrolyte for a fully charged battery at 27C is 1.28.
(ix) The number of diodes used in an alternator is 6 (in a three-phase full-wave rectifier).
(x) Coil springs are used in independent suspension systems.
b) State True or False:
(i) Radiator tubes are generally made of copper. True
(ii) In the semi-centrifugal clutch, the centrifugal force is proportional to the speed. True
(iii) In air suspension system, the pressure in the bellows is maintained from 5 to 7 kg/cm2. True
(iv) Thermal efficiency of two stroke engine is less than that of a four stroke engine. True
(v) A thermistor is used in an alternator regulator to control maximum current. False
a. The transistor controls the current in the regulator.
b. Bendix drive is an important drive arrangement of the starter motor.
c. Universal joint is used to connect the propeller shaft.
d. A square type engine has equal bore and stroke dimensions.
e. Number of plies in a truck tire is usually more than 10 (commonly 10 to 16 plies).
f. The efficiency of hydraulic brake system is usually 90 to 95%.
g. Average standard efficiency of Otto cycle (petrol engine) is 25 to 30%.
h. A governor limits the maximum speed of engine.
i. A wet clutch is one which operates in an oil bath.
j. A multi-plate type of clutch is used in two wheelers.
k. The various types of gear boxes are sliding mesh, constant mesh, and synchromesh.
l. Overdrive is interposed between the transmission and propeller shaft.
m. The member that creates reaction in a torque converter is the stator.
n. Hotchkiss drive torque reaction is taken by the leaf spring.
o. The sideways movement of a vehicle while cornering is called body roll or lateral sway (commonly
referred to as body roll).
a. The compression ratio of Diesel engine is higher than Petrol engine.
b. Octane number is the value of gasolines resistance to knocking.
c. Torque converter is used in automatic transmission.
d. To avoid skidding on wet roads, anti-lock braking system (ABS) type of brakes is used in
automobiles.
e. Universal joint is used to transmit power at varying angles.
f. To produce electric power, an alternator is used in an automobile.
g. A fully charged battery has a specific gravity of 1.28 (at 27C).
h. Alternators winding is done with copper wires.
i. Bleeding is the process of removing air from the brake system.
j. Number of coil turns is less in primary winding than secondary winding in H.T. (High Tension) coil.
k. Tie rod is the link of steering system.
l. C.R.D.I. (Common Rail Direct Injection) technology is used in diesel engines.
m. The outward tilt of the wheel from vertical axis is called positive camber.
n. Power available at the engine crankshaft is called brake horsepower (BHP).
o. Generally the material of the contact breaker points is tungsten.
a. Petrol engine works on Otto cycle.
b. MPFI stands for Multi-Point Fuel Injection.
c. A brake converts kinetic energy to heat energy.
d. With the increase of battery temperature, the specific gravity of electrolyte decreases.
e. Coil springs are used in suspension system.
f. Another name for torsion bar is torque bar.
g. Universal joint is used for connecting a propeller shaft.
h. The crown wheel and pinion is called final drive.
i. Shock absorber in an automobile is used to dissipate energy (or absorb vibrations).
j. Pneumatic brakes are used in heavy vehicles (such as trucks and buses).
i. A jeep is generally provided with four-wheel drive.
ii. The term MPFI is used in petrol engines.
iii. The clutch is mounted between engine and gearbox (transmission).
iv. The tilting of front wheels from the vertical is called camber.
v. The type of steering gear used in Maruti 800 car is rack and pinion.
vi. The brake bleeding process removes air from the system.
vii. Coil springs are used in independent suspension system.
viii. Specific gravity of electrolyte is measured by hydrometer.
ix. Number of diodes used in an alternator are 6 (in a 3-phase full-wave rectifier).
x. Hydrocarbon emissions from diesel engine are lower as compared to petrol engines.
b) State True or False:
xi. Tata Nano car is front wheel drive car. True
xii. Radiator tubes are generally made of copper. True
xiii. The co-efficient of friction of clutch facing is approximately 0.4 True
xiv. Air brakes are used in heavy vehicles. True
xv. An under-inflated tyre will wear the tread most near the centre. False
