0
Q:

Which of the following factors affecting combustion in the CI engine?

A) compression ratio B) intake temperature
C) jacket water temperature D) all of the mentioned
 
Answer & Explanation Answer: A) compression ratio

Explanation: The factors affecting combustion in CI engine are
i) ignition quantity of fuel
ii) injection pressure of droplet size
iii) injection advance angle
iv) compression ratio
v) intake temperature
vi) jacket water temperature
vii) intake pressure
vii) engine speed
ix) load and air to fuel ratio
x) engine size
xi) type of combustion chamber.

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1972
Q:

Automobile gears are generally made of ______________

A) cast iron B) stainless steel
C) alloy steel D) mild steel
 
Answer & Explanation Answer: C) alloy steel

Explanation: Steel mixed with copper, zinc and tin is used to make gears in automobiles.

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1713
Q:

A six cylinder, four-stroke diesel engine develops 125 kW at 3000 rpm. Its brake specific fuel consumption is 200gm/kW h. Calculate the quantity of fuel to be injected per cycle per cylinder. Specific gravity of the fuel may be taken as 0.85.

A) 0.0545 cc/cycle B) 0.545 cc/ cycle
C) 5.45 cc/cycle D) none of the mentioned
 
Answer & Explanation Answer: A) 0.0545 cc/cycle

Explanation: Not available for this question

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1128
Q:

Hunting occurs due to which of the following?

A) Faulty governor B) Poor control by the governor
C) Over control by the governor D) Bad engine design
 
Answer & Explanation Answer: B) Poor control by the governor

Explanation: Hunting occurs due to load variation and this is only when the governor is not controlled properly.

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1113
Q:

For a given temperature T1, as the difference between T1 and T2 increases, the COP of a carnot heat pump ___________

A) increases B) decreases
C) first increases, then decreases D) none of the mentioned
 
Answer & Explanation Answer: B) decreases

Explanation: COP(heat pump) = T?/(T? – T?)
As the value of T? – T? increases, value of COP decreases.

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934
Q:

The major loss in a S.I. engine is due to ____________

A) exhaust blow down B) pumping
C) incomplete combustion D) variation in specific heat and chemical equilibrium
 
Answer & Explanation Answer: D) variation in specific heat and chemical equilibrium

Explanation: The major loss in a S.I. engine is due to variation in specific heat and chemical equilibrium while the major loss in a C.I. engine is loss due to incomplete combustion.

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913
Q:

The brake mean effective pressure of an I.C. engine with an increase in speed will ____________

A) increase B) decrease
C) remain same D) none of the mentioned
 
Answer & Explanation Answer: C) remain same

Explanation: None.

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772
Q:

D-MPFI system uses ___________

A) port injection B) direct injection
C) manifold injection D) throttle body injection
 
Answer & Explanation Answer: B) direct injection

Explanation: D-MPFI system uses direct injection and L-MPFI system uses port injection while multi-point fuel injection system uses port injection and throttle body injection.

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