AAI Technical Rapid Quiz-3

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Question 1

A wire rope for a vertical mine hoist to lift a load of 50 kN from a depth of 150 meters. Wire rope attain the speed of 10 m/s in 10 seconds. Additional load due to upward acceleration of rope is ___________ N.

• A5000
• B5090
• C5097
• D6000

Question 2

In this curve axis X and Y represents (based on the usual standards)

• AX for rate of shear, Y for Shear stress
• BX for Shear stress, Y for rate of shear deformation
• CX for rate of shear deformation , Y for shear stress
• DX for rate of shear , Y for rate of shear deformation

Question 3

Gate is provided in moulds to:

• AGive passage to gases
• BCompensate for shrinkage
• CFeed the casting at a constant rate
• DAvoids cavities

Question 4

A Carnot heat engine is operating between a source at T_H and a sink at T_L. If it is desired to double the thermal efficiency of this engine, keeping the sink temperature constant. What should be the new source temperature (T_H)?

• A
• B
• C
• D

Question 5

Consider the following PERT network:

The critical path duration of the network (in days) is _______.

• A11
• B17
• C9
• D18

Question 6

The process utilizing mainly thermal energy for removing material is

• AUltrasonic Machining
• BElectrochemical Machining
• CAbrasive Jet Machining
• DLaser Beam Machining

Question 7

A counter flow heat exchanger is employed to cool 0.55 kg/s () of oil from 115 °C to 40 °C by the use of water. The inlet and outlet temperature of cooling water () are 15 °C and 75 °C, respectively. The effectiveness of the heat exchanger is ____.

• A0.60
• B0.45
• C0.30
• D0.75

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