Mechanical Engineering Answers

If want to design a machine, the general demands are followings except ( ). A.Realize the required functions B.Good performance C.High cost D.High efficiency

The machine consists of the followings except ( ).

A.Prime mover B.Working system C.Transmission system D.Execution system

A spur standard gear mechanism, increase its module and remain its diameter unchanged, which

can( ).

A.Increase its load B.Increase its pressure angle C.Increase its transmission angle D.Increase its efficiency

 A mechanism has 4 links, there are ( ) instant centers of velocity

A.2 B.4 C.6 D.8

These descriptions of higher pair, ( A.Connected with surface C.Wear slower

) is correct.

B.Connected with point or line

D.Constrain 2 DOFs

These descriptions of machine, mechanism, link and part, ( A. Part is the minimum motion element

B. Link is the minimum manufacturing element

C. Mechanism must have a relative fixed link as frame D. Machine can’t transmit information

For the description of machine, mechanism, link and parts, ( ) is correct.

A.Parts is motion element B.Link is manufacturing element

C.Machine and mechanism are machinery D.Maybe there is no frame in a mechanism

In cam mechanism, the angle which the cam turns when the follower at the fastest is called ( ).

A.Cam angle for rise B.Cam angle for return

C.Cam angle for outer dwell D.Cam angle for inner dwell

Find out about the wall construction of the cabins of large commercial airplanes (say the Boeing 777), the range of ambient conditions under which they operate, typical heat transfer coefficients on the inner and outer surfaces of the wall, and the heat generation rates inside. Determine the size of the heating and air-conditioning system that will be able to maintain the cabin at 20 °C at all times for an airplane capable of carrying 400 people.

Find if the given integer is prime number