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Set 25 - Motor E-Pareeksha unsolved questions

Share your knowledge to help your friends. Here are some important questions to which candidates have many answers. So if you have the answer with any reference, please help others by giving the answers in the comment box below. It will be helpful for others.

 1) The main requirements which a fuel injection system must fulfil are
a) accurate metering of small amount of fuel oil.
b) control of quality of fuel injection
c) proper timing of the fuel injection
d) selective distribution of the fuel in the combustion space.

 2) Which of the following layers of a thin shell bearing gives it its fatigue strength?
A.The overlay
B.The interlay
C.The backing
D.The barrier layer

 3) Prompt correction of speed of diesel engines driving alternators, without having massive fluctuations is ensured by incorporating:
A.Load limiting devices
B.Load sharing devices
C.Load sensing devices
D.Load shedding devices

 4) The use of ball and roller bearings in internal combustion engines is becoming more and more popular for some or all of the following
(a) The low coefficient of friction
(b) The absence of wear under favorable conditions
(c) The independence in lubrication
(d) The extreme reliability of such bearings

 5) An auxiliary engine turbo-charger makes strange noises when the load changes. The engine parameters however are absolutely fine. An external examination of turbocharger parameters as stated in the manual also reveals nothing. Would you
a) continue to run the engine and wait for some time
b) stop the engine for a while and make some checks
c) reduce the load of the engine
d) run it on steady load to make some checks.

 6) In modern marine 2-stroke diesel engines, ________________ is sometimes used as a coating on the underside of the exhaust valve disc, to reduce the rate of hot corrosion.

 7) Which of the following types of damages are metal seatings of a valve subject to?Choose the correct alternative.
A. Corrosion, Erosion, Abrasion, Deformation
B. Corrosion, Fatigue failure, brittle fracture, caustic cracking
C. Erosion, caustic cracking, brittle fracture, Cloverleafing
D. None of the above

 8) Which of the following is one of the disadvantages of cast iron chokes, used in holding down arrangement of engines?
A. Poor compressive strength
B. Poor vibration damping
C. Cast iron is brittle and prone to crack
D. All of the above

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