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Free download in PDF IC Engine Multiple Choice Questions and Answers for competitive exams. These short objective type questions with answers are very important for competitive exams as well as Board exams. These short solved questions or quizzes are provided by Gkseries.
(1)
The working cycle in case of four stroke engine is completed in following number of revolutions of crankshaft
[A]
1/2
[B]
1
[C]
2
[D]
4
(2)
In a diesel engine, the fuel is ignited by
[A]
spark
[B]
injected fuel
[C]
heat resulting from compressing air that is supplied for combustion
[D]
ignition
Answer: heat resulting from compressing air that is supplied for combustion
(3)
The ratio of indicated thermal efficiency to the corresponding air standard cycle efficiency is called
[A]
Net Efficiency
[B]
Efficiency Ratio
[C]
Relative Efficiency
[D]
Overall Efficiency
Answer: Relative Efficiency
(4)
If the intake air temperature of I.C. engine increases, its efficiency will
[A]
Increase
[B]
Decrease
[C]
Remain Same
[D]
Unpredictable
(5)
All heat engines utilize
[A]
low heat value of oil
[B]
high heat value of oil
[C]
net claorific value of oil
[D]
calorific value of fuel
Answer: low heat value of oil
(6)
Fuel oil consumption guarantees for I .C. engine are usually based on
[A]
low heat value of oil
[B]
high heat value of oil
[C]
net calorific value of oil
[D]
calorific value of fuel
Answer: high heat value of oil
(7)
In case of gas turbines, the gaseous fuel consumption guarantees are based on
[A]
high heat value
[B]
low heat value
[C]
net calorific value
[D]
middle heat value
(8)
The pressure and temperature at the end of compression stroke in a petrol engine are of the order of
[A]
4 - 6 kg/cm2 and 200 - 250°C
[B]
6 - 12 kg/cm2 and 250 - 350°C
[C]
12 - 20 kg/cm2 and 350 - 450°C
[D]
20 - 30 kg/cm2 and 450 - 500°C
Answer: 6 - 12 kg/cm2 and 250 - 350°C
(9)
The maximum temperature in the I.C. engine cylinder is of the order of
[A]
500- 1000°C
[B]
1000- 1500°C
[C]
1500-2000°C
[D]
2000-2500°C
(10)
Pick up the wrong statement
[A]
2-stroke engine can run in any direction
[B]
In 4-stroke engine, a power stroke is obtained in 4-strokes
[C]
petrol engines work on otto cycle
[D]
petrol engines occupy more space than diesel engines for same power output
Answer: petrol engines occupy more space than diesel engines for same power output
(11)
The fuel in diesel engine is normally injected at pressure of
[A]
5-10 kg/cm2
[B]
20-25 kg/cm2
[C]
60-80 kg/cm2
[D]
90-130 kg/cm2
(12)
The specific fuel consumption per BHP hour for diesel engine is approximately
[A]
0.15 kg
[B]
0.2 kg
[C]
0.25 kg
[D]
0.3 kg
(13)
The temperature of interior surface of cylinder wall in normal operation is not allowed to exceed
[A]
80°C
[B]
120°C
[C]
180°C
[D]
240°C
(14)
Compression loss in I.C engines occurs duto
[A]
leaking piston rings
[B]
use of thick head gasket
[C]
clogged air-inlet slots
[D]
all of the above
(15)
The specific fuel consumption per BH hour for a petrol engine is approximately
[A]
0.15 kg
[B]
0.2 kg
[C]
0.25 kg
[D]
0.3kg
(16)
The inlet value of a four stroke cycle I.C engine remains open for nearly
[A]
180°
[B]
125°
[C]
235°
[D]
200°
(17)
Which of the following is not an interns combustion engine
[A]
2-stroke petrol engine
[B]
4-stroke petrol engine
[C]
diesel engine
[D]
steam turbine
(18)
For the same compression ratio
[A]
Otto cycle is more efficient than the Diesel
[B]
Diesel cycle is more efficient'than Otto
[C]
both Otto and Diesel cycles are, equally efficient
[D]
compression ratio has nothing to do with efficiency
Answer: Otto cycle is more efficient than the Diesel
(19)
As a result of detonation in an I.C. engine, following parameter attains very high value
[A]
peak pressure
[B]
rate of rise of pressure
[C]
rate of rise of temperature
[D]
peak temperature
Answer: rate of rise of pressure
(20)
Which of the following statements is correct?
[A]
All the irreversible engines have same efficiency
[B]
All the reversible engines have same efficiency
[C]
Both Rankine and Caront cycles have same efficiency between same temperature limits
[D]
All reversible engines working between same temperature limits have same-efficiency
Answer: All reversible engines working between same temperature limits have same-efficiency