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IC Engines Quiz | IC Engines Objective Type Questions & Answers

Questions
21 For the same power developed in I.C. engines, the cheaper system is_____________?
A naturally aspirated
B supercharged
C centrifugal pump
D turbo charger

Answer: supercharged
22 Flash point of fuel oil is __________________?
A minimum temperature to which1 oil is heated in order to give off inflammable vapours in sufficient quantity to ignite momentarily when brought in contact with a flame
B temperature at which it solidifies or congeals
C temperature at which it catches fire without external aid
D indicated by 90% distillation temperature, i.e. when 90% of sample oil has distilled off

Answer: minimum temperature to which1 oil is heated in order to give off inflammable vapours in sufficient quantity to ignite momentarily when brought in contact with a flame
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23 The operation of forcing additional air under pressure in the engine cylinder is known as________________?
A scavenging
B turbulence
C supercharging
D pre-ignition

Answer: supercharging
24 The magneto in an automobile is basically__________________?
A transformer
B d.c. generator
C capacitor
D magnetic circuit

Answer: d.c. generator
25 Which of the following is false statement. Some of the methods used to reduce diesel smoke are as follows ________________?
A using additives in the fuel
B engine derating i.e. reducing the maxi-mum flow of fuel
C increasing the compression ratio
D adherence to proper fuel specification

Answer: increasing the compression ratio
26 In a cycle, the spark lasts roughly for ____________________?
A 1 sec
B 0.1 sec
C 0.01 sec
D 0.001 sec

Answer: 0.001 sec
27 A diesel engine as compared to petrol engine (both running ar rated load) is ____________________?
A more efficient
B less efficient
C equally efficient
D unperdictable

Answer: more efficient
28 Most high speed compression engines operate on ___________________?
A Otto cycle
B Diesel cycle
C Dual cycle
D Carnot cycle

Answer: Dual cycle
29 The cam shaft of a four stroke I.C. engine running at 1500 rmp will run at __________________?
A 1500 rpm
B 750 rpm
C 3000 rpm
D any value independent of engine speed

Answer: 750 rpm
30 The term scavenging is generally associated with______________________?
A 2-stroke cycle engines
B 4-stroke cycle engines
C aeroplane engines
D high efficiency engines

Answer: high efficiency engines
31 Fuel consumption of diesef engines is not guaranteed at one quarter load because at such low loads________________?
A the friction is high
B the friction is unpredictable
C the small difference in cooling water temperature or in internal friction has a disproportionate effect
D the engine is rarely operated

Answer: the small difference in cooling water temperature or in internal friction has a disproportionate effect
32 A heat engine utilises the_________________?
A calorific value of oil
B low heat value of
C high heat value of oil
D mean heat value of oil

Answer: high heat value of oil
33 The rating of a diesel engine, with increase in airintlet temperature, will ___________________?
A increase linearly
B decrease linearly
C increase parabolically
D decrease parabolically

Answer: decrease linearly
34 Scavenging is usually done to increase__________________?
A thermal efficiency
B speed
C power output
D fuel consumption

Answer: power output
35 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

Answer: 15 : 1
36 Air fuel ratio at which a petrol engine can not work is_________________?
A 8 : 1
B 10 : 1
C 15 : 1
D 20 : 1 and less

Answer: 20 : 1 and less
37 The following volume of air is required for consuming 1 liter of fuel by a four stroke engine_______________?
A 1 m3
B 5 m3
C 5-6 m3
D 9-10 m3

Answer: 9-10 m3
38 A 5 BHP engine running at full load would consume diesel of the order of_________________?
A 0.3 kg/hr
B 1 kg/hr
C 3 kg/hr
D 5 kg/hr

Answer: 1 kg/hr
39 Volatility of diesel fuel oil is_________________?
A minimum temperature to which oil is heated in order to give off inflammable vapours in sufficient quantity to ignite momentarily when brought in contact with a flame
B temperature at which it solidifies or congeals
C it catches fire without external aid
D indicated by 90% distillation temperature, i.e., when 90% of sample oil has distilled off

Answer: indicated by 90% distillation temperature, i.e., when 90% of sample oil has distilled off
40 A hmh flame speed is obtained in diesel engine when air fuel ratio is_______________?
A uniform throughout the mixture
B chemically correct mixture
C about 3-5% rich mixture
D about 10% rich mixture

Answer: about 10% rich mixture

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