Lakshya Education MCQs

Question: The voltage required to produce a spark across the gap, between the sparking points is
Options:
A.2000 to 4000 volts
B.4000 to 6000 volts
C.6000 to 10,000 volts
D.10,000 to 12,000 volts
Answer: Option C

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Question 1. The compensating jet in a carburettor supplies almost constant amount of petrol at all speeds because the
  1.    Jet area is automatically varied depending on the suction
  2.    The flow from the main jet is diverted to the compensating jet with increase in speed
  3.    The diameter of the jet is constant and the discharge coefficient is invariant
  4.    Flow is produced due to the static head in the float chamber
Answer: Option D
Question 2. The process of breaking up or a liquid into fine droplets by spraying is called
  1.    Vaporisation
  2.    Carburetion
  3.    Ionization
  4.    Atomization
Answer: Option D
Question 3. The correct sequence of the decreasing order of brake thermal efficiency of the three given basic types of engines is
  1.    Four stroke C.I. engine, four stroke S.I. engine, two stroke S.I. engine
  2.    Four stroke S.I. engine, four stroke C.I. engine, two stroke S.I. engine
  3.    Four stroke C.I. engine, two stroke S.I. engine, four stroke S.I. engine
  4.    Two stroke S.I. engine, four stroke S.I. engine, four stroke C.I. engine
Answer: Option A
Question 4. Pick up the wrong statement about supercharging
  1.    Supercharging reduces knocking in diesel engines
  2.    There can be limited supercharging in petrol engines because of detonation
  3.    Supercharging at high altitudes is essential
  4.    Supercharging results in fuel economy
Answer: Option D
Question 5. The following volume of air is required for consuming 1 liter of fuel by a four stroke engine
  1.    1 m3
  2.    5 m3
  3.    56 m3
  4.    910 m3
Answer: Option D
Question 6. The working cycle in case of four stroke engine is completed in following number of revolutions of crankshaft
  1.    1/2
  2.    1
  3.    2
  4.    4
Answer: Option C

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