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BHEL Electrical Question Papers 2008
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21. A pressure of 25m of head of water is equal to. =245kN/m2

22. For a submerged body to be in stable equilibrium, the centre of gravity should be. =Below the centre of buoyancy.
23. 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.

24. The actual velocity at vena contracta for flow through an orifice from a reservoir of height H=?. =Cvv2gH

25. 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

26. In a free vortex motion: = each particle moves in a circular path with a speed varying inversely as the distance from the centre.

27. 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

28. 10m of water column is equal to = 100kN/m2

29. M.I. of a circular area about an axis perpendicular to the area is: = pr4/2

30. A projectile is fired at an angle ? to the vertical. Its horizontal range will be maximum when ? is . =450

31. 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.

32. 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
33. Sintered and tungsten carbides can be machined by: = EDM

34. A car is moving with a velocity of 60km/hr and possesses energy of 5x105 joules. The mass of the car will be. =3000kg.

35. 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. http://www.ChetanaS.org
36. 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
37. A body weighing 2kg in air weights 2.5kg when submerged in water. Its specific gravity is. = 6

38. 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.

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