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Internal Combustion Engines Fundamentals

Comprehensive quiz covering IC engine thermodynamic cycles, four-stroke operations, fuel properties, efficiency measurements, and design parameters for petrol and diesel engines.

25 Questions Published
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Questions

Question 1 Multiple Choice (Single Answer)

On which thermodynamics cycle does the petrol engine work?

  1. Otto cycle
  2. Joule cycle
  3. Rankine cycle
  4. Stirling cycle
Question 2 Multiple Choice (Single Answer)

In a four stroke cycle, the minimum temperature inside the engine cylinder occurs at the

  1. begining of suction stroke
  2. end of suction stroke
  3. begining of exhaust stroke
  4. end of exhaust stroke
Question 3 Multiple Choice (Single Answer)

In a four stroke cycle engine, the sequence of operation is

  1. suction, expansion, compression and exhaust
  2. suction, compression, expansion and exhaust
  3. expansion, compression, suction and exhaust
  4. compression, expansion, suction and exhaust
Question 4 Multiple Choice (Single Answer)

In a petrol engine, if diesel is used, then the engine will

  1. not run
  2. run more efficiently
  3. run at a high speed
  4. explode
Question 5 Multiple Choice (Single Answer)

The inlet valve of a four stroke cycle internal combustion engine remains open for

  1. 130 degrees
  2. 180 degrees
  3. 230 degrees
  4. 270 degrees
Question 6 Multiple Choice (Single Answer)

Scavenging efficiency of a four stroke cycle diesel engine is

  1. below 50%
  2. 50% to 85%
  3. 85% to 95%
  4. 95% to 100%
Question 7 Multiple Choice (Single Answer)

Air fuel ratio of the petrol engine is controlled by

  1. carburettor
  2. injector
  3. governor
  4. internal valves
Question 8 Multiple Choice (Single Answer)

High speed compression engines operates on

  1. otto cycle
  2. diesel cycle
  3. dual combustion cycle
  4. all of these
Question 9 Multiple Choice (Single Answer)

Voltage required to produce spark across the gap between the sparking points is

  1. 2000 volts to 4000 volts
  2. 4000 volts to 6000 volts
  3. 10000 volts to 12000 volts
  4. 12000 volts to 25000 volts
Question 10 Multiple Choice (Single Answer)

Loud pulsating noise in IC engine is

  1. detonation
  2. turbulence
  3. pre-ignition
  4. supercharging
Question 11 Multiple Choice (Single Answer)

Octane no. of petrol, generally available is

  1. 20 to 40
  2. 40 to 60
  3. 60 to 80
  4. 80 to 100
Question 12 Multiple Choice (Single Answer)

Ignition quality of petrol is expressed by

  1. cetane number
  2. octane number
  3. calorific value
  4. none of these
Question 13 Multiple Choice (Single Answer)

Ignition quality of diesel oil is expressed by

  1. cetane number
  2. octane number
  3. calorific number
  4. none of these
Question 14 Multiple Choice (Single Answer)

Cetane number of diesel oil is

  1. 20 to 25
  2. 25 to 30
  3. 30 to 40
  4. 40 to 55
Question 15 Multiple Choice (Single Answer)

The power actually developed by the engine cylinder of an IC engine is known as

  1. theoretical power
  2. actual power
  3. indicated power
  4. mechanical power
Question 16 Multiple Choice (Single Answer)

Ratio of brake power to indicated power is known as

  1. mechanical efficiency
  2. overall efficiency
  3. indicated thermal efficiency
  4. volumetric efficiency
Question 17 Multiple Choice (Single Answer)

Morse test can be conducted for

  1. petrol engines
  2. diesel engines
  3. multi cylinder engines
  4. all of these
Question 18 Multiple Choice (Single Answer)

The thermal efficiency of a standard otto cycle for a compression ratio of 5.5 will be

  1. 25%
  2. 50%
  3. 70%
  4. 100%
Question 19 Multiple Choice (Single Answer)

A petrol engine has compression ratio

  1. 6 to 10
  2. 10 to 15
  3. 15 to 25
  4. 25 to 40
Question 20 Multiple Choice (Single Answer)

The pressure at the end of compression in a diesel engine is

  1. 10 bar
  2. 20 bar
  3. 25 bar
  4. 35 bar
Question 21 Multiple Choice (Single Answer)

A diesel engine has compression ratio from

  1. 6 to 10
  2. 10 to 15
  3. 15 to 25
  4. 25 to 35
Question 22 Multiple Choice (Single Answer)

The brake power is the power available

  1. in the engine cylinder
  2. at the crank shaft
  3. at the crank pin
  4. None of these
Question 23 Multiple Choice (Single Answer)

A diesel engine has

  1. one valve
  2. two valves
  3. three valves
  4. four valves
Question 24 Multiple Choice (Single Answer)

In a petrol engine, the correct mixture of air and petrol is

  1. 10 : 1
  2. 15 : 1
  3. 20 : 1
  4. 25 : 1
Question 25 Multiple Choice (Single Answer)

The pressure at the end of compression in petrol engine is approximately

  1. 10 bar
  2. 20 bar
  3. 25 bar
  4. 35 bar
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