BREB Assitant Engineer (Mechanical) questions

Bangladesh Rural Electrification Board (BREB) 

Post: Assistant Engineer (Mechanical)

22) Carbide tipped tools usually have

a) Negative rank angle

b) Positive rank angle

c) Any rake angle

d) No rake angle

23) The type of tool used on lathe, shaper and planer is -

a) Single point cutting tool

b) Two point cutting tool

c) Three point cutting tool

d) Multi point cutting tool

24) The process extensively used for making bolts and nuts is

a) Hot piercing

b) Extrusion

c) Cold peering

d) Cold heading

25) Cold working of metal increases

a) Tensile strength

b) Yield strength

c) Hardness

d) All of above

26) Ball bearings are, usually made from

a) Low carbon steel

b) High Carbon steel

c) High speed steel

d) All of the above

27) Cast Iron has

a) High compressive strength

b) Good wear resistance

c) Excellent machinability

28) The Property of a material which enables it to retain the deformation permeability is called

a) Brittleness

b) Ductility

c) Plasticity

d) Malleability

29) The size of gear is usually specified by

a) Pressure angle

b) Pitch Circle diameter

c) Circular Pitch

d) Tooth thickness

30) A spring is used to

a) Measure forces

b) Apply forces

c) Store energy

d) All of the above

31) An universal coupling is used to connect two shafts

a) Which are perfectly aligned

b) Which are not in exact alignment

c) Have lateral misalignment

d) Whose axes intersect at a small angle

32) The material generally used for air-craft components is

a) Mild steel

b) High Speed steel

c) Stainless Steel

d) Aluminum

33 ) The property of a material which enable it to be drawn into the wire with the application of a tensile force, is called

a) Plasticity

b) Elasticity

c) Ductility

d) Malleability

34) The power from the engine to the rear axle of an automobile is transmitted by

a) Worm and worm wheel

b) Super gears

c) Bevel gears

d) Hook’s joint

35) In Mechanical refrigeration system, the refrigerant has the maximum temperature

a) In evaporator

b) Before expansion valve

c) Between compressor and condenser

d) Between condenser and evaporator

36) The amount of radiation mainly depends upon the

a) Nature of the body

b) Temperature of the body

c) Type of surface of the body

d) All of the above

37) Fourier’s law of heat conduction gives the heat flow for

a)Irregular surface

b) Non-uniform temperature surface

c) One dimensional cases only

d) Two dimensional cases only

38) The process of heat transfer from one particle of the body to another is called conduction, when the particles of the body

a) Move actually

b) Do not move actually

c) Affect the intervening medium

d) Does not affect the intervening medium

39) A carburetor is used to supply

a) Petrol, air and lubricating oil

b) Air and Petrol

c) Petrol and lubricating oil

d) Petrol and air

40) If petrol is used in diesel engine, then

a) Low power will be produced

b) Efficiency will be low

c) Higher knocking will occur

d) Black smoke will be produced

41) Parson’s turbine is a

a) Simple impulse turbine

b) Simple reaction turbine

c) Impulse reaction turbine

d) None of the above

42) The action of steam in a steam turbine is

a) Static

b) Dynamic

c) Static and dynamic

d) Neither static neither dynamic