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Free download in PDF IC Engines Objective Type Questions & Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries.
(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
(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
(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
(24)
The magneto in an automobile is basically__________________?
[A]
transformer
[B]
d.c. generator
[C]
capacitor
[D]
magnetic circuit
(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
(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
(28)
Most high speed compression engines operate on ___________________?
[A]
Otto cycle
[B]
Diesel cycle
[C]
Dual cycle
[D]
Carnot 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
(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
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
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
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
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
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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