AAI Technical Rapid Quiz-43

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Question 1

The normal stresses at a point are,, and the shear stress at this point is . The maximum principal stress at this point would be

• A15 MPa
• B13MPa
• C11 MPa
• D9.6 MPa

Question 2

The ratio of ultimate stress & working stress is called —

• AFactor of safety
• BModulus of elasticity
• CPoisson’s ratio
• DNone of the above

Question 3

The frictional resistance for turbulent flow in a pipe varies approximately as

• AVelocity of flow
• B
• C
• D

Question 4

In impulse turbine, pressure on the two side of the moving blades -

• ADecreases
• BIncreases
• CRemains same
• DMay decrease or remain constant

Question 5

The dimensionless number relevant to transient heat conduction is

• AFourier number
• BReynolds number
• CPrandtl number
• DStanton number

Question 6

Investment casting is used for

• AMass production
• BShapes that are made with difficulty using complex patterns in sand casting
• CStainless steel parts
• DShapes which are complex, intricate and cannot be cast by any other method

Question 7

In case of two meshing gears both with involute tooth profiles, contact is made when the tip of the:

• ADriven wheel touches the flank of the driving wheel
• BDriven wheel touches the face of a tooth of the driving wheel
• CDriving wheel touches the face of a tooth of the driven wheel
• DDriving wheel touches the flank of a tooth of the driven wheel

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