Automobile Engineering MCQ

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• Which one of the following pairs is incorrect?
  ক

  Bajaj Auto ⇔ Two wheelers and Three wheelers

  খ

  Mahindra & Mahindra ⇔ Jeeps and Tractors

  গ

  Premier Automobiles ⇔ Petrol cars and Diesel cars

  ঘ

  TELCO ⇔ Tractors and trucks
• Two general types of tyres are
  ক

  Tube type and tubeless

  খ

  Solid and tubeless

  গ

  Air and pneumatic

  ঘ

  Split rim and drop centre
• Which one of the following statements correctly describes the construction of a planetary gear type differential?
  ক

  The six planetary pinions rotate in constant mesh with the internal gears.

  খ

  One drive shaft is splined to the central gear and the other to the planetary gear.

  গ

  Each planetary pinion gear meshes with both the central gear and the internal gear.

  ঘ

  The internal gear is fixed to the planetary gear.
• Which one of the following statement correctly describes the construction of a bevel gear type differential?
  ক

  The drive shafts are splined to the differential carrier.

  খ

  The left side gear and the differential carrier rotate in constant unison.

  গ

  The differential carrier houses differential pinion gears and side gears; each pinion gear meshes with a different side gear.

  ঘ

  The differential carrier houses differential pinion gears and side gears.
• The main merit of a multi cylinder type cylinder sleeve is
  ক

  Smaller engine dimensions

  খ

  Better cooling efficiency

  গ

  High rigidity

  ঘ

  None of these
• The materials used for cylinder block are
  ক

  Cast iron and steel

  খ

  Cast iron and aluminium alloy

  গ

  Steel and aluminium alloy

  ঘ

  Brass and steel
• In which of the following conditions, the idle CO percentage should be measured with the vehicle?
  ক

  Headlights and other electrical devices are switched off

  খ

  Headlights and other electrical devices are switched on

  গ

  Headlights and other lights are switched off

  ঘ

  Headlights are switched on
• An oil filter bypass valve opens when the
  ক

  Engine is cold

  খ

  Engine overheats

  গ

  Oil filter becomes clogged

  ঘ

  Engine runs at high speed
• The advantage of the fuel injection system over the carburettor system is
  ক

  Improved fuel efficiency

  খ

  Improved emission

  গ

  Improved power output

  ঘ

  All of these
• The octane number of compressed natural gas (CNG) is
  ক

  90

  খ

  100

  গ

  110

  ঘ

  120
• In vehicles with tilt steering, the steering column is pivoted in
  ক

  Upper bracket

  খ

  Lower bracket

  গ

  Tilt bracket

  ঘ

  Steering yoke joint
• In a Diesel engine, the fuel is ignited by
  ক

  An electric spark

  খ

  The heat of compression

  গ

  The hot exhaust

  ঘ

  None of these
• With the increase of battery temperature, the specific gravity of electrolyte
  ক

  Increases

  খ

  Decreases

  গ

  Remains the same

  ঘ

  None of these
• The advantage of a tubeless tyre over tube type tyre is
  ক

  Slow air leakage

  খ

  Better fuel efficiency

  গ

  Less chances of running flat

  ঘ

  All of these
• The auto ignition in a spark ignition engine means
  ক

  Automatic ignition of the charge at the end of compression

  খ

  Ignition induced by the passage of a spark

  গ

  Ignition of the charge before the passage of flame front

  ঘ

  Ignition induced to supplement the process of normal combustion
• Valve overlap is the number of degrees of camshaft rotation during which
  ক

  Both valves are closed

  খ

  Both valves are open

  গ

  Both 'A' and 'B'

  ঘ

  None of these
• When the top of the wheel is tilted outward, then it is called
  ক

  Positive camber

  খ

  Negative camber

  গ

  Positive caster

  ঘ

  Negative caster
• The connecting rod is attached to the piston by the
  ক

  Cap bolt

  খ

  Piston pin

  গ

  Cap roller bearing

  ঘ

  Rod cap
• If the valve clearances are excessively large, the problem that can arise is
  ক

  Overheating of the engine

  খ

  Incomplete valve closure

  গ

  Fouling of spark plug by gasoline

  ঘ

  None of these
• The specific gravity of acid in a fully charged battery is generally
  ক

  1.00

  খ

  1.28

  গ

  1.82

  ঘ

  2.81
• The reconditioning process used to give cylinder bore surfaces a crosshatch pattern, is known as
  ক

  Honing

  খ

  Porous plating

  গ

  Boring

  ঘ

  Shot peening
• Cushioning springs in clutch plate reduces
  ক

  Vehicle speed

  খ

  Torsional vibrations

  গ

  Jerky starts

  ঘ

  None of these
• A three way catalytic converter
  ক

  Re-circulates exhaust gases

  খ

  Burns fuel vapour gases

  গ

  Reduces N₂, H₂O and CO₂ emission levels

  ঘ

  Removes CO, HC and NO₂ from the exhaust gases passing through it
• When a gear box has four forward speeds and one reverse speed, it is said to be a
  ক

  3-speed gear box

  খ

  4-speed gear box

  গ

  5-speed gear box

  ঘ

  6-speed gear box
• The function of positive crankcase ventilation (PCV) system is that it
  ক

  Mixes fuel with air

  খ

  Promotes combustion by creating a swirling movement in the air-fuel mixture

  গ

  Returns blow by gases from the crankcase to the intake system

  ঘ

  Feeds blow by gases to the exhaust manifold
• The fuel pump in the programmed fuel injection (PFI) system is located
  ক

  Between the fuel filler pipe and fuel tank

  খ

  In the fuel tank

  গ

  On the distributor mounting in the engine compartment

  ঘ

  On the engine compartment bulkhead
• In a forced feed lubrication system, the device used to guard against excessive oil pressure, is known as
  ক

  Release chamber

  খ

  Balancer

  গ

  Relief valve

  ঘ

  Stop valve
• The fuel pump of a programmed fuel injection (PFI) system operate for two seconds when the ignition is turned to the start position to
  ক

  Enable the pump's fault diagnosis function to operate

  খ

  Warm up and lubricate the pump

  গ

  Supplies a large amount of fuel and thereby creates a choke effect

  ঘ

  Pressurise the fuel system before the engine is started
• The main function of an exhaust muffler is the
  ক

  Optimization of exhaust efficiency

  খ

  Reduction of exhaust noise

  গ

  Reduction of nitrogen oxide in the exhaust gases

  ঘ

  Reduction of the exhaust gas volume
• The most effective method of controlling S.I. engine exhaust emission is by
  ক

  Recirculating exhaust

  খ

  Using catalytic converter

  গ

  Using some additives in the fuel

  ঘ

  None of these