Mechanical Engineering Paper
attended the BHEL Engineer Trainee written test in Mechanical stream. They
conducted for four brances in Engineering: Comp sci, ECE, EEE and Mechanical. In
Mechanical Branch there were a total of 240 questions. 120- Technical questions
in Mechanical Engineering. 120- General Apptitude questions. (Quantitative
Aptitude, Reasoning Ability, Logical thinking, English usage).
questions were mainly asked in
you are thorough with your subject, you can really do well in this session.
Mark for correct answer, 1/5th for wrong answer. Five choices were given] Some
questions which i remember are :
of Entropy (J/kg K or kJ/kg K)?
2)A mass of 100kg is falling from a height of 1 m and penetrates the sand into
for 1 m. What is the resistance force given by sand?
3)Ratio of specific heats of air ? (1.41)
4)A body weighs 3 kg in air. If it is submerged in a liquid, it weighs 2.5 kg.
What is the specific gravity of the liquid ?
5)Two cars travell in same direction at 40 km/hr at a regular distance. A car
comes in a opposite direction in 60km/hr. It meets each car in a gap of 8
seconds. What is the distance between them?
6)A simple problem involing in hoops stress. For sphere: M= [3/2]*p*V* [density
of pressure vessel material/Maximum working stress it can tolerate] For Thin
walled pressure walls: Hoops stress or stress in the radial direction =p*r/2t?
A problem in force calculation in a body moving in a inclined surface?
Compostion of stainless steel.?
CI is manifactured in which process?
ans. cupola process
percentage of carbon is preset in pig iron?
ans. 4.5 to 6%.
is available at 10m height. What is the pressure available?
will happen if the speed of the centrifugal pump doubles?
unit eV is widely used in ?
ans. Nuclear and atomic physics.
will happen to the resistance, when the diameter of the conductor is doubled?
power comsumed by a electrical device is 1000W at 250V, What is the resistance
in the device?
ans. Power= Voltage*current,
Therefore R=250/4=62.5 ohms.
DC current is not used in transformer?
what principle the sonar/ radar works?
moment diagram for the UDL is in what shape?
of the distributor in petrol vehicles?
ans. Spark timing.
is not present in CI engines?
will happen if one cylinder recieves more amount of fuel spray from injectors
than other injectors?
of draft tube in hydraulic turbines?
The purpose of a draft tube is toconvert some of the kinetic energy of the flow
from the runner (the rotating part of the turbine) intopressure energy and
thereby increase the efficiency ofthe hydro power turbine.
is the effect or reheater in the gas turbine?
advantage of reheater is significantly increased thrust; the
disadvantage is it has very high fuel consumption and inefficiency.
involving with fricition coefficient.
of safety = Yeild stress/Working stress.
is the example of non parallel power transmission (Universal coupling)?
perpendicular shafts worm gear is used?
planet gear with 25 teeth is meshed with a sun gear of 100 teeth. Both are
connected using a arm. How many rotations are needed for planet gear to complete
one rotation around the sun gear?
is equivalent spring constant for spring in parallel?
Some questions was asked related to boundary layer and vortex flow.
5 questions were asked in PERT, Process planning, Product planning, Break even
are tungsten and sintered composite materials are machined?
(Electro Discharge Machining, EDM)
are 120 questions .
the words with wrong spellings (5 questions).
Fill in the blanks with appropriate words(5 questions).
Two reading comprehensions were given(10 questions).
Find the error in the sentence (8 questions).
Find the relation between them.
of the questions are from basic geometry .
Remaining were very general and easy. But many questions are there that's y you
should consider time factor and be quick.