Consider the following statements concerning distinctive features of an I.C. engine:
ombustion and conversion of heat energy into mechanical work occur inside a cylinder
low weight to power ratio
high overall efficiency
easy and instantaneous starting
which of these statements are correct
1 and 2
1, 2 and 4
1, 3 and 4
1, 2, 3 and 4
The slotted grooves on oil rings for pistons help to
Seal the cylinder
Mnimise friction
Prevent the piston from wear
Provide an escape for the oil that the slots edge out from the cylinder walls
Automobile connecting rods are mass produced by
Cold heading
Forging
Fine and casting
Die casting
The compression ratio of an I.C. engine is the ratio of
Swept volume to clearance volume
Total cylinder volume to clearance volume
Total cylinder volume to swept volume
Pressure after compression to that before compression
Stroke of an I.C. engine equals
Half the crank radius
The crank radius
Twice the crank radius
Four times the crank radius
Which does not constitute the theoretical cycle for the working of a practical I.C. engine?
Otto cycle
Diesel cycle
Dual cycle
Ericsson cycle
Which type of engine most cars have?
Two stroke cycle engine
Four stroke cycle engine
Rotary wankel engine
Free piston engine
The number of working strokes per minute in case of four stroke I.C. engine will be equal to
N/2
N
2N
4N
A four stroke petrol engine theoretically operates on
Otto cycle
Brayton cycle
Joule cycle
Bell coleman cycle
The rolls Royce merlin engine working on an air standard otto cycle has the following particularas
Piston diameter (bore)=13.7 cm
Stroke length=13.0 cm
Clearance volume=280 cm
the compression ratio will be
the air standard efficiency will be about
5.2, 23%
6.7, 37%
7.85, 41%
8.1, 56%
(1,c) and (2,d)
In six cylinder engines, the power impulse occurs after……. Degrees of crank rotation
60
90
120
180
To satisfy the condition as regards evenness of torque, the firing order of a four cylinder engine is
1-2-3-4
1-3-2-4
1-3-4-2
1-4-3-2
For a six cylinder engine the firing order is
1-2-3-6-5-4
1-5-3-6-2-4
1-4-2-5-6-3
1-3-6-5-2-4
A particular firing order is necessary in a multi-cylinder engine so as to
Have better balance of the engine
Give good distribution of fuel to all the cyclinders
Obtain uniform toque
Operate the ignition system smoothly
Which is not a part of magneto-ignition system?
Battery
Induction coil
Circuit breaker
Condenser
Which aspect is not true in the context of coil ignition system when compared with magneto ignition system?
Provides adequate voltage even at very low engine speeds
Cheap and reliable
Easy maintenance
More circuit wiring and hence more liable to wire faults
The basic requirements of fuel injection in compression ignition engines are:
Accurate metering and proper atomiazation of fuel
Proper timing and suitable rate of fuel injection
Proper distribution of atomized fuel in combustion sparce
All
Which one of the followings does not form a part of the fuel supply system of a diesel engine?
Fuel pump
Spray nozzle
Compensating jet
Injector
Which element regulates the pressure strokes in the fuel injection pump os a diesel engine?
Needle valve
Pump shaft
Control rack
Lift of plunger
Adjustment in the fuel injection timing in the fuel injection pumping of diesel engine is made by adjusting the
Plunger valve
Needle valve
Control rack
Pump camshaft