IC Engines Objective Type Questions & Answers

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

View Answer

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

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

View Answer

Answer: supercharging

24 The magneto in an automobile is basically__________________?

A transformer

B d.c. generator

C capacitor

D magnetic circuit

View Answer

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

View Answer

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

View Answer

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

View Answer

Answer: more efficient

28 Most high speed compression engines operate on ___________________?

A Otto cycle

B Diesel cycle

C Dual cycle

D Carnot cycle

View Answer

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

View Answer

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

View Answer

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

View Answer

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

View Answer

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

View Answer

Answer: decrease linearly

34 Scavenging is usually done to increase__________________?

A thermal efficiency

B speed

C power output

D fuel consumption

View Answer

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

View Answer

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

View Answer

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

View Answer

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

View Answer

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

View Answer