I.c. Engines MCQs

Option A: 6° to 20°

Option B: 220° to 345°

Option C: 65° to 220°

Option D: 15° to 120°

Correct Answer: 65° to 220° ✔

Option A: Brown coal

Option B: Anthracite coal

Option C: Hard coke

Option D: Woodchar coal

Correct Answer: Hard coke ✔

Option A: Coke

Option B: Coal

Option C: Peat

Option D: None of these

Correct Answer: Coke ✔

Option A: Wood

Option B: Peat

Option C: Bituminous coal

Option D: Anthracite coal

Correct Answer: Anthracite coal ✔

Option A: 33500 kj/kg

Option B: 25000 kj/kg

Option C: 23000 kj/kg

Option D: 19700 kj/kg

Correct Answer: 19700 kj/kg ✔

Option A: Wood

Option B: Peat

Option C: Lignite

Option D: All of above

Correct Answer: All of above ✔

Option A: Higher

Option B: Lower

Option C: Equal

Option D: None of these

Correct Answer: Faheem Zaman Dhaunroo ✔

Option A: Constant temperature cycle

Option B: Constant Volume cycle

Option C: Constant Pressure Cycle

Option D: All of above

Correct Answer: Constant Pressure Cycle ✔

Option A: For petrol and large gas engines, quantity governingds preferred

Option B: In quantity governing, air fuel ratio is almost constant and quantity of charge is changed depending on load

Option C: In hit and miss governing, fuel supply is completely cut off during one or more number of cycles

Option D: In quality governing, quantity of fuel is varied to suit the load and total charge of air is varied

Correct Answer: In quality governing, quantity of fuel is varied to suit the load and total charge of air is varied ✔

Option A: Unaltered

Option B: Increased

Option C: Decreased

Option D: Advanced

Correct Answer: Advanced ✔

Option A: feed petrol into cylinder

Option B: govern the engine

Option C: break up and mix the petrol with air

Option D: heat up the charge to cylinder

Correct Answer: break up and mix the petrol with air ✔

Option A: 0.334027778

Option B: 0.500694444

Option C: 0.625694444

Option D: 0.834027778

Correct Answer: 0.625694444 ✔

Option A: concentric type

Option B: eccentric type

Option C: horizontal type

Option D: vertical type

Correct Answer: concentric type ✔

Option A: high compression ratio

Option B: low compression ratio

Option C: low volumetric efficiency

Option D: minimum turbulence

Correct Answer: high power output and high thermal efficiency ✔

Option A: Maximum

Option B: Optimum

Option C: Poor

Option D: Constant

Correct Answer: Poor ✔

Option A: clearance volume

Option B: swept volume

Option C: compression ratio

Option D: volumetric efficiency

Correct Answer: compression ratio ✔

Option A: higher knocking will occur

Option B: efficiency will be low

Option C: low power will be produced

Option D: black smoke will be produced

Correct Answer: higher knocking will occur ✔

Option A: the shape and layout of the piston crown, the inlet port, and the valve produce the turbulent effect of fuel mixture

Option B: fuel is injected into an auxiliary chamber that is separated from the cylinder by an orifice or throat

Option C: only a part of air charge is contained in an auxiliary chamber in which the fuel starts to burn with insufficient air which due to explosion tendency mixes thoroughly into main cylinder charge

Option D: there are no valves

Correct Answer: fuel is injected into an auxiliary chamber that is separated from the cylinder by an orifice or throat ✔

Option A: Supercharged

Option B: Not supercharged

Option C: Charged

Option D: Supercharged provided its speed is low

Correct Answer: Not supercharged ✔

Option A: suction port and exhaust port

Option B: transfer port only

Option C: suction port and transfer port

Option D: transfer port and exhaust port

Correct Answer: suction port, exhaust port and transfer port ✔

Option A: size of flywheel

Option B: weight of engine

Option C: type of lubrication system

Option D: absence of valves

Correct Answer: absence of valves ✔

Option A: Zero

Option B: 5-10%

Option C: Depends on load

Option D: Considerable percent

Correct Answer: Zero ✔

Option A: increase

Option B: decrease

Option C: remain unaffected

Option D: increase/decrease depending upon engine capacity

Correct Answer: increase ✔

Option A: The shape and layout of the pistion crown, the inlet port, and the valve produce the turbulent effect of fuel mixture

Option B: Fuel is injected into an auxiliary chamber that is separated from the cylinder by an orifice or throat

Option C: Only a part of air charge is contained in an auxiliary chamber in which the fuel starts to burn with insufficient air which due to explosion tendency mixes thoroughly into main cylinder charge

Option D: There are no valves

Correct Answer: Only a part of air charge is contained in an auxiliary chamber in which the fuel starts to burn with insufficient air which due to explosion tendency mixes thoroughly into main cylinder charge ✔

Option A: 10 kg/cm2

Option B: 100 kg/cm2

Option C: 500 kg/cm2

Option D: 1400 kg/cm2

Correct Answer: 1400 kg/cm2 ✔

Option A: Zero

Option B: 5-10%

Option C: Depends on load and quality of fuel

Option D: Considerable percent

Correct Answer: Considerable percent ✔

Option A: Half

Option B: One

Option C: Two

Option D: Four

Correct Answer: One ✔

Option A: Decreases

Option B: Increases

Option C: Remains same

Option D: Decreases upto a limit and then increases

Correct Answer: Decreases ✔

Option A: 90%

Option B: 50%

Option C: 40%

Option D: 30%

Correct Answer: 30% ✔

Option A: quantity governing

Option B: quality governing

Option C: combined governing

Option D: partial governing

Correct Answer: quantity governing ✔

Option A: quantity governing

Option B: quality governing

Option C: combined governing

Option D: partial governing

Correct Answer: quality governing ✔

Option A: 100%

Option B: 50%

Option C: 5%

Option D: 30%

Correct Answer: 30% ✔

Option A: 2%

Option B: 4%

Option C: 8%

Option D: ±4%

Correct Answer: 4% ✔

Option A: give lot of smoke

Option B: detonate

Option C: knock

Option D: not run

Correct Answer: not run ✔

Option A: about twice

Option B: about 0.5 times

Option C: nearly equal

Option D: about 1.7 times

Correct Answer: about 1.7 times ✔

Option A: S.I. engine

Option B: C.I. engine

Option C: both are equally good

Option D: multicylinder engine

Correct Answer: C.I. engine ✔

Option A: increases

Option B: decreases

Option C: remains unaffected

Option D: depends on other factors

Correct Answer: decreases ✔

Option A: S.I. engine

Option B: C.I. engine

Option C: two stroke engine

Option D: four stroke engine

Correct Answer: C.I. engine ✔

Option A: the shape and layout of the piston crown, the inlet port, and the valve produce the turbulent effect on fuel mixture

Option B: fuel is injected into an auxiliary chamber that is separated from the cylinder by an orifice or throat

Option C: only a part of air charge is contained in an auxiliary chamber in which the fuel starts to burn with insufficient air which due to explosion tendency mixes thoroughly into main cylinder charge

Option D: fuel is injected at atmospheric pres¬sure

Correct Answer: the shape and layout of the piston crown, the inlet port, and the valve produce the turbulent effect on fuel mixture ✔

Option A: increase the knocking tendency

Option B: decrease the knocking tendency

Option C: not affect the knocking tendency

Option D: increase or decrease knocking tendency depending on strength and time of spark

Correct Answer: increase the knocking tendency ✔

Option A: gas engine

Option B: 2-stroke S.I. engine

Option C: 4-stroke S.I. engine

Option D: steam engine

Correct Answer: 4-stroke C.I. engine ✔

Option A: 92%

Option B: 68%

Option C: 52%

Option D: 34%

Correct Answer: 34% ✔

Option A: 6 to 12 volts

Option B: 240 volts

Option C: 1000 volts

Option D: 20,000 volts

Correct Answer: 20,000 volts ✔

Option A: increase the knocking tendency

Option B: decrease the knocking tendency

Option C: not affect the knocking tendncy

Option D: increase or decrease knocking tendency depending on strenght and time of spark

Correct Answer: increase the knocking tendency ✔

Option A: ignition coil

Option B: ignition coil and distributor

Option C: ignition coil and condenser

Option D: ignition coil and contact breaker

Correct Answer: ignition coil ✔

Option A: lean mixture

Option B: theoretically correct mixture

Option C: rich mixture

Option D: any type of mixture

Correct Answer: rich mixture ✔

Option A: governor

Option B: crank shaft

Option C: gear box

Option D: flywheel

Correct Answer: flywheel ✔

Option A: same level

Option B: slightly higher level

Option C: slightly lower level

Option D: may be anywhere

Correct Answer: slightly higher level ✔

Option A: 0.85

Option B: 1

Option C: 1.1 to 1.3

Option D: 1.2 to 1.5

Correct Answer: 1 ✔

Option A: increase the knocking tendency

Option B: decrease the knocking tendecny

Option C: not affect the knocking tendency

Option D: increase or decrease knocking tendency depedning on strength and time of spark

Correct Answer: increase the knocking tendency ✔

Option A: lower than the coldest atmospheric temperature at which oil is to be pumped

Option B: higher than above

Option C: has no such relation

Option D: more than 100°C

Correct Answer: lower than the coldest atmospheric temperature at which oil is to be pumped ✔

Option A: production of highly corrosive gases corroding the cylinder walls and exhaust system

Option B: excessive engine wear

Option C: damaging of both the storage tank and the engine

Option D: deposition on engine parts

Correct Answer: deposition on engine parts ✔

Option A: rotating the crank

Option B: adjusting the spark plug gap

Option C: adjusting ignition coil position

Option D: rotating the distributor

Correct Answer: rotating the distributor ✔

Option A: 0.2 to 1.0 liter per minute per h.p.

Option B: 1 to 3 liters per minute per h.p.

Option C: 5 to 10 liters per minute per h.p

Option D: 10 to 20 liters per minute per h.p.

Correct Answer: 1 to 3 liters per minute per h.p. ✔

Option A: increases.

Option B: decreases

Option C: remains same

Option D: unpredictable

Correct Answer: decreases ✔

Option A: distribute charge, equally to all the cylinders

Option B: regulate power

Option C: feed lub oil to all moving parts

Option D: time the spark

Correct Answer: time the spark ✔

Option A: smaller

Option B: bigger

Option C: same size

Option D: dependent on other engine parameters

Correct Answer: bigger ✔

Option A: liquid fuel only

Option B: liquid fuel and air

Option C: solid fuel

Option D: solid fuel and air

Correct Answer: liquid fuel only ✔

Option A: lean mixture

Option B: chemically correct mixture

Option C: rich mixture

Option D: unpredictable

Correct Answer: rich mixture ✔

Option A: more

Option B: less

Option C: same

Option D: more upto some load and then less

Correct Answer: less ✔

Option A: keep the exhaust pipes warm

Option B: reduce formation of condenstae

Option C: reduce heat transfer to the engine room

Option D: increase engine efficiency

Correct Answer: reduce heat transfer to the engine room ✔

Option A: Lean mixture

Option B: Chemically correct fuel air ratio

Option C: Rich mixture

Option D: Unpredictable

Correct Answer: Chemically correct fuel air ratio ✔

Option A: bigger flywheel

Option B: smaller flywheel

Option C: same size flywheel

Option D: no flywheel

Correct Answer: bigger flywheel ✔

Option A: lean mixture

Option B: chemically correct mixture

Option C: rich mixture

Option D: unpredictable

Correct Answer: lean mixture ✔

Option A: forced lubrication system

Option B: splash lubrication

Option C: applying grease under pressure

Option D: wet sump method

Correct Answer: mixing about 5% lub oil with petrol ✔

Option A: 5:25:30:50

Option B: 25:35:5:35

Option C: 25:5:10:60

Option D: 40:30:15:15

Correct Answer: 25:5:35:35 ✔

Option A: air only

Option B: liquid fuel only

Option C: liquid fuel and air

Option D: supercharging

Correct Answer: liquid fuel and air ✔

Option A: decrease

Option B: increase

Option C: remain unalfected

Option D: depend on other factors

Correct Answer: increase ✔

Option A: 75 cc per min. per h.p.

Option B: 750 cc per min. per h.p.

Option C: 7500 cc per min. per h.p.

Option D: 75000 cc per min. per h.p.

Correct Answer: 75000 cc per min. per h.p. ✔

Option A: increase

Option B: decrease

Option C: remain unaffected

Option D: depend on other factors

Correct Answer: increase ✔

Option A: 1%

Option B: 5%

Option C: 0.1%

Option D: 0.01%

Correct Answer: 1% ✔

Option A: higher self ignition temperature

Option B: lower self ignition temperature

Option C: proper self ignition temperature

Option D: self ingition temperature has nothing to do with detonation

Correct Answer: higher self ignition temperature ✔

Option A: 2-stroke engine can run in any direction

Option B: In 4-stroke engine, a power stroke is obtained in 4-strokes

Option C: thermal efficiency of 4-stroke engine is more due to positive scavenging

Option D: petrol engines work on otto cycle

Correct Answer: petrol engines occupy more space than diesel engines for same power output ✔

Option A: supercharging reduces knocking in diesel engines

Option B: there can be limited supercharging in petrol engines because of detonation

Option C: supercharging at high altitudes is essential

Option D: supercharging results in fuel economy

Correct Answer: supercharging results in fuel economy ✔

Option A: All the irreversible engines have same efficiency

Option B: All the reversible engines have same efficiency

Option C: Both Rankine and Caront cycles have same efficiency between same temperature limits

Option D: All reversible engines working between same temperature limits have same-efficiency

Correct Answer: All reversible engines working between same temperature limits have same-efficiency ✔

Option A: Thermal efficiency of diesel engine i about 34%

Option B: Theoretically correct mixture of air am petrol is approximately 15 : 1

Option C: High speed compression engines operate on dual combustion cycle

Option D: Diesel engines are compression ignition engines

Correct Answer: S.I. engines are quality-governed engines ✔

Option A: 10%

Option B: 5%

Option C: 1%

Option D: 0.1%

Correct Answer: 1% ✔

Option A: 15-20%

Option B: 20-25%

Option C: 25-30%

Option D: 30-35%

Correct Answer: 30-35% ✔

Option A: 1-3-6-5-2-4

Option B: 1-4-2-5-6-3

Option C: 1-6-2-5-4-3

Option D: 1-5-2-6-3-4

Correct Answer: 1-5-3-4-2-6 ✔

Option A: increase

Option B: decreae

Option C: be unaffected

Option D: depend on other factors

Correct Answer: increase ✔

Option A: varying compression ratio

Option B: using lian mixture

Option C: retarding the spark timing

Option D: reducing the r.p.m.

Correct Answer: retarding the spark timing ✔

Option A: 1

Option B: 0.7

Option C: 0.85

Option D: 0.5

Correct Answer: 0.85 ✔

Option A: 1-2-3-4

Option B: 1-3-2-4

Option C: 1-4-2-3

Option D: 1-2-4-3

Correct Answer: 1-3-2-4 ✔

Option A: 0°C

Option B: – 10°C

Option C: 10°C

Option D: less than – 30°C

Correct Answer: 0°C ✔

Option A: 5

Option B: 7

Option C: 10

Option D: 13

Correct Answer: 7 ✔

Option A: octane number

Option B: cetane number

Option C: calorific value

Option D: carbon content

Correct Answer: cetane number ✔

Option A: auto ignition

Option B: preignition

Option C: retarded ignition

Option D: accelerated ignition

Correct Answer: preignition ✔

Option A: instantaneous auto-ignition of last part of charge to be burnt

Option B: improper mixing of air and fuel

Option C: improper combustion

Option D: self ignition temperature has nothing to do with detonation

Correct Answer: instantaneous auto-ignition of last part of charge to be burnt ✔

Option A: enhanced by increasing compression ratio

Option B: enhanced by decreasing compression ratio

Option C: unaflected by compression ratio

Option D: first enhanced by increasig compression ratio upto a limit beyond which it will be suppressed

Correct Answer: enhanced by decreasing compression ratio ✔

Option A: the time taken by fuel after injection (before top dead center) to reach upto auto-ignition temperature

Option B: time before actual fuel injection and the pump pluger starts to pump fuel

Option C: time corresponding to actual injection and top dead center

Option D: time corresponding to actual ignition and top dead center

Correct Answer: time before actual fuel injection and the pump pluger starts to pump fuel ✔

Option A: 1%

Option B: 0.5%

Option C: 0.1%

Option D: 0.01%

Correct Answer: 1% ✔

Option A: not true

Option B: true at full load

Option C: true at part load

Option D: true at both part and full load

Correct Answer: true at both part and full load ✔

Option A: low temperature

Option B: low density

Option C: long ignition delay

Option D: rich mixture

Correct Answer: all of the above ✔

Option A: high temperature

Option B: high density

Option C: short delay

Option D: reactive mixture

Correct Answer: all of the above ✔

Option A: reduce cost

Option B: improve surface finish

Option C: prevent clogging

Option D: reduce wear and eliminate scuffing

Correct Answer: reduce wear and eliminate scuffing ✔

Option A: reduce weight

Option B: conduct heat efficiently

Option C: reduce possibility of scoring

Option D: reduce friction

Correct Answer: reduce possibility of scoring ✔

Option A: V-type

Option B: In-line

Option C: Vertical

Option D: Horizontal

Correct Answer: Horizontal ✔

Option A: compression ring

Option B: oil ring

Option C: scrapper ring

Option D: groove ring

Correct Answer: compression ring ✔

Option A: cast iron

Option B: aluminium

Option C: phosphor bronze

Option D: babbitt

Correct Answer: cast iron ✔

Option A: compact design requiring lesser space

Option B: improved distribution of air to cylinder

Option C: casting less liable to distortion

Option D: reduced torsional vibration because of shorter crankshaft

Correct Answer: less overhead clearance ✔