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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
A 61300 V concentric cable with two inter-sheaths has a core diameter of 2.3 cm;
dielectric material of 3.3 mm thickness constitutes three zones of insulation.
Determine the maximum stress in each of the three layers, if 21300 V is maintained
across each of the inner two layers.
Connect two conductors to the sheath. Measure the capacitance, Cd between the remaining single conductor and the two other conductors and the sheath. Take the capacitance between the shorted cores and the sheath as Cb. Now determine the effective capacitance of each conductor to the grounded neutral.
Draw an Energy Material Signal Flow for a simple Submarine
(D^-4)Y=2cos^×
Pure water was used to remove 90% ammonia from the gas mixture in packed bed tower. The gas
mixture which contain 5 mol% NH 3 enters from the bottom of the column at flow rate of 100 kmol/h.
Pure water enters from the top of the column at a flow rate 1.5 times minimum pure water flow rate
(1.5 L’ min ). The column cross sectional area is 0.20 m 2 . The equilibrium relationship for NH 3 and water
is given by y = 0.8915x. The film mass transfer coefficients are given as k’ y a = 0.0739 kmol/s.m 3 and
k’ x a = 0.169 kmol/s.m 3 . Determine the height of the packed tower using liquid film mass transfer
coefficient, k’ x a.
