Description : Which of the following performance characteristics of a S.I engine is not affected by the front end volatility of the petrol used? (A) Vapour locking (B) Hot starting (C) Spark plug fouling (D) All 'a', 'b' & 'c'
Last Answer : (C) Spark plug fouling
Description : The temperature at which the air cannot hold all the water vapour mixed in it and some vapour starts condensing is called as A. humidification temperature B. dehumidification temperature C. dew point temperature D. none of the above
Last Answer : ANSWER : C
Description : Amount of water vapour in a unit volume (Cubic metre) of air is called: (1) Mixed ratio (2) relative humidity (3) absolute humidity (4) specific humidity
Last Answer : (3) absolute humidity Explanation: Absolute humidity is the measure of water vapor (moisture) in the air, regardless of temperature. It is expressed as grams of moisture per cubic meter of air (g/m3).
Description : Stabilisation of gasoline (petrol) means (A) Removal of dissolved gases from it (B) Increasing its oxidation stability (C) Improving its lead susceptibility (D) Increasing its vapour pressure
Last Answer : (A) Removal of dissolved gases from it
Description : Which of the following has the minimum value of COP for a given refrigeration effect? (A) Reverse Carnot cycle (B) Ordinary vapour-compression cycle (C) Vapour-compression process with a reversible expansion engine (D) Air refrigeration cycle
Last Answer : (D) Air refrigeration cycle
Description : Out of the following refrigeration cycles, which one has the minimum COP (Co-efficient of performance)? (A) Air cycle (B) Carnot cycle (C) Ordinary vapour compression cycle (D) Vapour compression with a reversible expansion engine
Last Answer : A) Air cycle
Description : Air fuel ratio at which a petrol engine cannot work is A. 8:1 B. 12:1 C. 15:1 D. 20:1 and less
Last Answer : ANSWER : D
Description : Air fuel ratio for idling speed of a petrol engine is approximately A. 1:1 B. 5:1 C. 20:1 D. 10:1
Description : The theoretically correct air fuel ratio of a petrol engine is of the order of A. 6:1 B. 10:1 C. 15:1 D. 20:1
Description : The fuel air ratio in a petrol engine fitted with suction carburetor, operating with dirty air filter as compared to clean filter will be A. higher B. lower C. remain unaffected D. unpredictable
Last Answer : ANSWER : A
Description : The air-fuel ratio of the petrol engine is governed by A. fuel pump B. governor C. carburetor D. injector
Description : The air requirement of a petrol engine during starting compared to the theoretical air requirement for complete combustion is A. more B.unpredictable C. same D. less
Description : The air requirement of a petrol engine during starting compared to theoretical air required for complete combustion is a. more b. less c. same d. may be more or less depending on engine capacity
Last Answer : ANSWER b. less
Description : Air fuel ratio at which a petrol engine cannot work is a. 8:1 b. 10:1 c. 20:1 and less d. 15:1
Last Answer : ANSWER c. 20:1 and less
Description : The theoretically correct air fuel ratio for petrol engine is of the order of a.6 : 1 b. 9 : 1 c. 12 : 1 d. 15 : 1
Last Answer : Answer d. 15:1
Description : Air-petrol ratio in an automotive petrol engine is around (A) 14 : 1 (B) 22 : 1 (C) 25 : 1 (D) 4 : 1
Last Answer : (A) 14 : 1
Description : Air-petrol ratio for maximum power generation in spark ignition engine is about (A) 6 : 1 (B) 12 : 1 (C) 18 : 1
Last Answer : Option B
Description : When `PtE_(6)` vapour mixed with an equal volume of Xe, the gases combined immediatedly at room temperature and produces a yellow solid X at `66^(@)C`
Last Answer : When `PtE_(6)` vapour mixed with an equal volume of Xe, the gases combined immediatedly at room temperature and produces ... ]^(+) [Pt_(2)F_(11)]^(-)`
Description : LMTD can't be used as such without a correction factor for the (A) Multipass heat exchanger (B) Baffled heat exchanger (C) Condensation of mixed vapour in a condenser (D) All (A) (B) and (C)
Last Answer : (D) All (A) (B) and (C)
Description : Denatured spirit is ethanol mixed with (1) Petrol (2) Kerosene (3) Water (4) Pyridine
Last Answer : Pyridine
Description : A 0.064 kg of octane vapor (MW = 114) is mixed with0.91 kg of air (MW = 29.0) in the manifold of an Engine. The total pressure in the manifold is 86.1 kPa, and a temperature is 290 K. assume octane behaves ideally. What is ... of the air in the mixture in KPa? a. 46.8 b. 48.6 c. 84.6 d. 64.8
Last Answer : 84.6
Description : The increasing amount of CO2 in the atmosphere is slowly raising its temperature because it absorbs (a) the infrared part of the solar radiation (b) the ultraviolet part of the solar radiation (c) all the solar radiations (d) the water vapour of the air
Last Answer : Ans:(a)
Description : The basis of diesel/petrol engine is Chemical change of
Last Answer : liquid when under goes
Description : List the differences between petrol engine and diesel engine.
Last Answer : Petrol Engine 1. Petrol vapour is used as fuel 2. Petrol engines are spark ignition engines. It requires a spark plug. 3. Cost of petrol is comparatively high. 4. Expansion of gaseous products with ... 6. Compression of air is in the ratio 4:1 to 25:1 4. Expansion against constant pressure.
Description : In the expansion stroke of a petrol engine, the piston is pushed with a great stroke. Why?
Last Answer : When the petrol-air mixture is ignited, carbon dioxide, carbon monoxide and water vapour expands suddenly. This exerts a great force on the piston.
Description : Briefly explain the working of a petrol engine.
Last Answer : In a petrol engine, petrol vapours are mixed with correct amount of air in the carburetor. This mixture is passed into the cylinder
Description : Mention the five stages in the working of a petrol engine.
Last Answer : a) Intake stroke c) Ignition stroke e) Exhaust strokeb) Compression stroke d) Expansion stroke
Description : Briefly explain the construction of a petrol engine.
Last Answer : A petrol engine consists of an air tight piston fitted inside a cylinder. The piston can move smoothly inside the cylinder. The cylinder has two valves - an inlet valve and an outlet valve ... with a carburetor where air and petrol are mixed in proper proportion before letting into the cylinder.
Description : Explain the principle of working of a diesel or petrol engine.
Last Answer : Chemical change of liquid fuels like petrol or diesel when under goes combustion produces large volume of gases and exerts pressure. This is the basis of working of petrol or diesel engine.
Description : Vapour lock is a. complete or partial stoppage of fuel supply due to vaporization of the fuel b. locking of carburetor due to high vapor pressure c. excess fuel supply to the engine d. supply of liquid fuel to the engine
Last Answer : ANSWER a. complete or partial stoppage of fuel supply due to vaporization of the fuel
Description : What happens if you use a petrol with a lower octane rating than recommended for your engine?
Last Answer : Using a petrol with a lower octane rating than recommended for your engine can cause knocking or pinging during combustion, which can damage the engine over time.
Description : Can premium petrol be used in any petrol engine?
Last Answer : Premium petrol can be used in most petrol engines, but may not provide any significant performance benefits in engines that are not designed for high-octane fuels.
Description : Can E85 petrol be used in any petrol engine?
Last Answer : E85 petrol can only be used in certain types of engines that are designed to run on high-ethanol blends.
Description : Can E10 petrol be used in any petrol engine?
Last Answer : E10 petrol can be used in most petrol engines, but may not be suitable for use in older or high-performance engines.
Description : Can biofuels be used in any petrol engine?
Last Answer : Some biofuels, such as ethanol blends, can be used in most petrol engines. However, some types of biofuels may require engine modifications or a special type of engine.
Last Answer : E10 petrol can be used in most petrol engines, but some older or high-performance engines may require a different fuel type. It's important to check your vehicle's owner's manual for guidance.
Description : Can LPG be used in any petrol engine?
Last Answer : No, not all petrol engines are designed to run on LPG. Vehicles must be equipped with a special LPG conversion kit in order to use LPG as a fuel.
Description : Can you use biodiesel in a petrol engine?
Last Answer : No, biodiesel is designed for use in diesel engines and can cause damage if used in petrol engines.
Last Answer : No, biodiesel
Description : What is the speed of the piston in the cylinder of a petrol engine ?
Last Answer : The speed of the piston in the cylinder of a petrol engine is also the speed of the alternator.
Last Answer : Discover petrol engine (Nicholas Auto)
Last Answer : Discover Petrol Injil: Nicholas Auto 7
Last Answer : Petrol engine was invented in 18th century.
Last Answer : ( a) Check the spark at the plug point. (B) Check whether the carburetor is running on petrol.
Description : The actual volume of fresh charge admitted in 4-stroke petrol engine is A. equal to stroke volume B. equal stroke volume and clearance volume C. less than stroke volume D. more than stroke volume
Description : A diesel engine compared to petrol engine, running at full load is A. less efficient B. equally efficient C. more efficient D. other factors will decide it
Description : The specific fuel consumption of a petrol engine compared to diesel engine of same H.P is A. same B.more C. less D. unpredictable
Last Answer : ANSWER : B
Description : If diesel is used in a petrol engine a. engine will not run b. engine detonates c. engine gives smoke d. engine knocks
Last Answer : ANSWER a. engine will not run
Description : The back pressure of petrol engine is usually a. 1 ata b. 1.2 ata c. 0.8 ata d. 2 ata.
Last Answer : ANSWER b. 1.2 ata
Description : For low load operation more economical engine is a. petrol engine b. diesel engine c. muticylinder engine d. two stroke engine
Last Answer : ANSWER b. diesel engine