Placement Papers - BHEL

BHEL PAPER AT NEW DELHI
Posted by :
Lpsit
(39)
BHEL PAPER AT NEW DELHI

The   ratio of two specific heats of air is equal to. = 1.41
A   perfect gas at 270C is heated at constant pressure till its volume is   double. The final temperature is = 3270C
An   engine operates between temperature of 9000K and T2 and another engine   between T2 and 8000K. For both to do equal work, value of T2 will be. =   6500K
Internal   energy of a substance depends on = Temperature
Work   done in compressing 1kg of gas adiabatically from p1,V1,T1 to p2, V2, T2 is   equal to = Cv(T2-T1)
The   unit of entropy is = J/kg 0K
Indicated   power of a 4-stroke engine is equal to = pLAN/2
Which   of the following is not an internal combustion engine : a) 2 stroke petrol   engine b)4 stroke petrol engine c) Diesel engine d) steam engine e) Gas   turbine. = (d)
If   one cylinder of a diesel engine receives more fuel than the others, then for   that cylinder the: a) exhaust will be smoky b) piston rings would stick into   piston grooves c) exhaust temperature will be high d) engine starts   overheating e) all of the above. = (e)
The   spark plug gap is normally maintained at: = 0.45 to 0.6mm
A   distributor in spark ignition engines performs the function of : = Providing   the correct firing order in engine
Which   of the following does not relate to C.I. engine::
a) fuel pump
b) fuel injector
c) governor
d) carburetor
e) flywheel = (d)
Air   fuel ratio in a jet engine is = 60:1
What   is the value of Prandtl No.?
In   domestic refrigerator, the tubes at the back of the refrigerator are:
a) evaporator
b) condenser
c) capillary tubes
d)???
Which   refrigerants has the highest critical point temperature. = Freon-11
Wet   bulb temperature is. = indication of amount of moisture in air
On   psychrometric chart, dry bulb temperature lines are. = Vertical
Surface   tension has the units. = newtons/m
The   line of action of the buoyant force acts through the. =centroid of the   displaced volume of fluid
A   pressure of 25m of head of water is equal to. =245kN/m2
For a   submerged body to be in stable equilibrium, the centre of gravity should be.   =Below the centre of buoyancy.
The   actual velocity at vena contracta for flow through an orifice from a   reservoir of height H=?. =Cv?2gH
A   body weighing 2kg in air weights 2.5kg when submerged in water. Its specific   gravity is. = 6
In a   free vortex motion: = each particle moves in a circular path with a speed   varying inversely as the distance from the centre.
A   centrifugal pump has speed-1000rpm, Flow-1200l.p.m, Head-20m, Power-5H.P. If   its speed is increased to 1500rpm, new flow will be.: = 1800l.p.m
Runaway   speed of a hydraulic turbine is: = the speed if the turbine runner is   allowed to revolve freely without load and with the wicket gates wide open.
10m   of water column is equal to = 100kN/m2
M.I.   of a circular area about an axis perpendicular to the area is: = ?r4/2
A   projectile is fired at an angle ? to the vertical. Its horizontal range will   be maximum when ? is . =450
An   elevator weighing 1000kg attains an upward velocity of 4m/sec in two seconds   with uniform acceleration. The tension in the supporting cables will be =   1200kg.
A 13m   ladder is placed against a smooth vertical wall with its lower end 5m from   the wall. What should be the co-efficient of friction between ladder and   floor so that it remains in equilibrium. = 0.21
A car   is moving with a velocity of 60km/hr and possesses energy of 5?105 joules.   The mass of the car will be. =3000kg.
If l   is the span of a light suspension bridge whose each cable carries total   weight (w) and the central diop is y, the horizontal pull at each support   is: = wl/y OR A beam of length l, having uniform load w kg/unit length is   supported freely at the ends. The moments at mid span will be: = wl2/8.
A   boiler shell 200cm dia and plate thickness 1.5cm is subjected to internal   pressure of 1.5MN/m2, then the hoop stress will be. = 100N/m2
100KW   is to be transmitted by each of two separate shafts. A is turning at 250rpm   and B at 300rpm. Which shaft must have greater diameter.: = B
Two   identical leaf springs of spring constant k are arranged like cantilevers in   parallel and attached at free end by a spring of spring constant k. The   equivalent spring constant of combination is; = 1.5k.
Automobile   steering gear is an example of: = lower pair.
The   type of coupling used to join two shafts whose axes are neither in same   straight line nor parallel, but intersect is. = Universal coupling.
To   transmit power from one rotation shaft to another whose axes are neither   parallel nor intersecting, use: = Spiral gear.
A   gear having 100 teeth is fixed and another gear having 25 teeth revolves   around it, the centre lines of both gears being joined by an arm. How many   revolutions will be made by gear of 25 teeth for one revolution of arm. = 5   rev.
The   secondary critical speed of a shaft occurs at: = twice the speed of primary   critical speed.
Brittle   coating technique is used for: = experimental stress analysis.
Factor   of safety is the ratio of: = yield stress/working stress.
Type   of gear used for non-intersection perpendicular shafts: = Hypoid gears.
Corrosion   resistance of steel is increased by adding: = Chromium & Nickel
The   product of Cupola is called: = cast iron
Brinell   tester uses a hardness steel ball of size: = 10mm
Sintered   and tungsten carbides can be machined by: = EDM
What   kind of abrasive cut off wheel should be used to cut concrete, stone and   masonry? =Diamond grit.
In   break-even analysis, total cost consists of: = Fixed cost + Variable cost.
The   amount deducted from the salary of workers towards employees provident fund   is : =deposited in the account of worker with Provident Fund Commissioner.
PERT   is: = event oriented technique
Bar   charts are suitable for: = minor works.
Electron   volt is the unit of : = Energy.