Odisha Public Service Commission Motor Vehicle Inspector Mechanical Paper 2016-17
Which of the following arrangement in an automobile engine change the reciprocating motion to rotary motion?
(a) Crank shaft and a camshaft
(b) Pistons and connecting rods
(c) Connecting rods and a crankshaft
(d) Camshaft and rocker arms
The swept volume of a piston with 0.1 m diameter 0.4 m length will be
(a) 0.003 cubic meter
(b) 0.03 cubic meter
(c) 0.3 cubic meter
(d) 3.0 cubic meter
The ‘firing order’ of an engine is the
(a) Order in which the cylinders are nubmered
(b) Order in which pistons are arranged
(c) Order in which the cylinders deliver thier power stroke
(d) Standard arrangement which can be altered by changing the crankshaft
A gasonline that detonates easily is called as
(a) High-octane gasonline
(b) Low-octane gasonline
(c) Unleaded gasonline
(d) Blended fuel
When the last part of air-fuel mixture explodes before being ignited by flame travelling from the spark plug, the effect is known as
(a) Detonation
(b) Preignition
(c) Stalling
(d) Vaporization
The portion of carburetor that reduces pressure to allow fuel flow, is called as
(a) Air bleed
(b) Fuel nozzle
(c) Venturi
(d) Throttle valve
Which ONE of the following statements is correct?
(a) Diesel engines have throttle valves to restrict air flow
(b) The power and speed of the diesel engine are controlled, in part by the spark advance
(c) Diesel engines have lower compression ratios than spark-ignition engines
(d) Diesel engines compress only air in the compression stroke
In the diesel engine, the fuel is injected into the cylinder
(a) At the end of power stroke
(b) Towards the end of compression stroke
(c) At the beginning of power stroke
(d) At the end of exhaust stroke
Combustion in CI engine cycle takes place in
(a) Isentropic process
(b) Isochoric process
(c) Isobaric process
(d) Isothermal process
For the same compression ratio and initial conditions for Diesel and Otto cycle which of the following statement is true for air standard efficiency
(a) Diesel cycle efficiency is higher
(b) Diesel and Otto cycle efficiencies are same
(c) Otto cycle efficiency is higher
(d) Can’t conclude from this
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