I. C. Engine Test

30 Questions | By Borneidentity19 | Last updated: Mar 21, 2022 | Total Attempts: 93

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Unit Test ( chapter 1 to 6 from syllabus)

Questions and Answers

1.

A cycle consisting of two constant volume and two isothermal processes is known as
- A.
  
  Stirling cycle
- B.
  
  Carnot cycle
- C.
  
  Otto cycle
- D.
  
  Joule cycle
2.

Spill port(valve) in helix Bypass pump connects
- A.
  
  Fuel tank and pump
- B.
  
  Fuel filter and fuel pump
- C.
  
  Common rail to fuel injector
- D.
  
  Fuel pump and fuel injector
3.

OHC in engine terminology means
- A.
  
  Over Lapping head compression
- B.
  
  On Head camshaft
- C.
  
  Over Head Chamber
- D.
  
  Organically Homogeneous Combustionz
4.

Ratio of work done by engine to stroke volume gives
- A.
  
  Mean effective pressure
- B.
  
  Volumetric efficiency
- C.
  
  Volumetric flow rate
- D.
  
  Specific equivalence ratio
5.

Which carburetor has triple venturies
- A.
  
  Solex carburetor
- B.
  
  Carter carburetor
- C.
  
  Zenith carburetor
- D.
  
  S.U. carburetor
6.

By increasing suction volume of engine, air standard efficiency of SI engine
- A.
  
  Increases
- B.
  
  Decreses
- C.
  
  Remains unaffected
- D.
  
  Varies exponantially
7.

For same BHP, the weight to power ratio is less for
- A.
  
  2 stroke engine
- B.
  
  4 stroke engine
8.

In ASTM distillation curve, the order of distillate in ascending order for following are :(a) kerosene(b)high speed diesel(c) gasoline(d) ethyle alchohol
- A.
  
  D - c- b - a
- B.
  
  A - b- c - d
- C.
  
  B - c -a- d
- D.
  
  A - d - b - c
9.

The amount of energy liberated by 1kg of fuel is known as
- A.
  
  Calorific value
- B.
  
  Specific Heat
- C.
  
  Enthalpy
- D.
  
  Heat Capacity
10.

Disintegration of combustion products at high temperature is known as _______________
11.

The reference fuels for knock rating of spark ignition engines would include
- A.
  
  Normal heptane and iso-octane
- B.
  
  Normal octane and aniline
- C.
  
  Iso-octane and normal hexane
- D.
  
  Iso-octane and alpha-methyl naphthalene
12.

Which type of engine head is shown in fig
- A.
  
  F head
- B.
  
  L head
- C.
  
  I head
- D.
  
  T head
13.

Small electrical resistance heater mounted inside the combustion chamber of many CI engines is known as
- A.
  
  Glow plug
- B.
  
  Spark plug
- C.
  
  Pressure transduser
- D.
  
  None
14.

High-pressure gases in the combustion chamber fromleaking past the piston into the crankcase
- A.
  
  Blow by
- B.
  
  Past over
- C.
  
  Vented by
- D.
  
  None
15.

Ideal air standard otto cycle is considered as a close loop cycle. True or False ?
- A.
  
  True
- B.
  
  False
16.

Butterfly valve mounted at the upstream end of the intake system is known as
- A.
  
  Throttle
- B.
  
  Choke
- C.
  
  Auxiliary
- D.
  
  None
17.

Presence of one of the following material can reduce the self ignition temperature and promote knock
- A.
  
  Sulphur
- B.
  
  Nitrogen
- C.
  
  Unburnt HC
- D.
  
  Vapor
18.

Clogging inlet manifold channel by rapid fuel evaporation is known as
- A.
  
  Manifold lock
- B.
  
  Vapor lock
- C.
  
  Choking
- D.
  
  None
19.

The compensating jet in a carburettor supplies almost constant amount of petrol at all speeds because the
- A.
  
  Jet area is automatically varied depending on the suction
- B.
  
  The diameter of the jet is constant and the discharge coefficient is invariant
- C.
  
  The diameter of the jet is constant and the discharge coefficient is invariant
- D.
  
  Flow is produced due to the static head in the float chamber
20.

Distribution of fuel particles in cylinder to achieve better fuel-air mixture is known as
- A.
  
  Atomization
- B.
  
  Penetration
- C.
  
  Turbulence
- D.
  
  Dispersion
21.

Gum formation occurs due to
- A.
  
  Oxidation of unsaturated hydrocarbons
- B.
  
  Oxidation of nitrogen
- C.
  
  Oxidation of saturated hydrocarbons
- D.
  
  All of above
22.

Air standard efficiency of diesel engine approaches to otto cycle efficiency when
- A.
  
  Cut off ratio is increased
- B.
  
  Cut off ratio is decreased
- C.
  
  Cut off ratio is constant
- D.
  
  Cut off ratio is Zero
23.

Which of following is known as indicator diagram
- A.
  
  P -theta
- B.
  
  P-V
- C.
  
  T-s
- D.
  
  P-T
24.

In 2 stroke 2 cylinder CI engine, running at 3000 rpm , no of sparks occurs in 5 min
- A.
  
  150000
- B.
  
  30000
- C.
  
  7500
- D.
  
  None
25.

"Common fuel consisting of 90% gasoline and 10% alcohol" is known as
- A.
  
  Gasohol
- B.
  
  Gasoline
- C.
  
  Blend
- D.
  
  Gasalcohol