IC Engine MCQs | IC Engine Multiple Choice Questions and Answers

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Questions
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

Answer: 2
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
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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

Answer: Decrease
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

Answer: low 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

Answer: 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

Answer: 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

Answer: 0.2 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

Answer: 180°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

Answer: 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

Answer: 0.25 kg
16 The inlet value of a four stroke cycle I.C engine remains open for nearly
A 180°
B 125°
C 235°
D 200°

Answer: 235°
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

Answer: 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

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