Final Exam
Requirement:
There are two parts in the final, please write your answer on
answer sheet, then take photo for your answer sheet and post
photo to me privately with WeChat before 2021/06/23.
Keep your answer sheet and take it to me when you come
back to HPU .
Anyone who don’t post answer photo to me before
2021/06/23 will lost credits in this course.
Part 1 (30 points)
Directions: there are 10 questions for you, from the 1st to 10th. Each question has four choices
marked A, B, C and D. Choose the best answer and then write the corresponding letter on your
answer sheet.
1. There are
turning pairs in fig1.
2. There are
3. There are
4.
Fig1
A. 7 B. 8 C. 9
turning pairs in fig2.
A. 3
links in fig3.
A. 0
is multiple pin joints fig4
A. turning pair A
D. 10
Fig2
B. 4 C. 5
D. 6
Fig3
B. 1 C. 2
D. 3
Fig4
B. turning pair B
C. turning pair C
D. turning pair D
5. There are
links in fig5.
Fig5
A.5 B.6 C.7 D.8
6. In a planar four bar linkage ,coefficient of travel speed variation may range
A． 0  K  1
7. In fig6 fall travel is
B． 0  K  2
C． 1  K  3
D． 1  K  2
.
Fig6
A . AB B .BC C . CD D .DA
8. In the following Basic Motion of the Follower, there exists rigid shock in
.
A . Constant velocity motion
B . Constant acceleration motion
C . Cosine acceleration motion D .Sine acceleration motion
9. In fig7
which is double rocker linkage？
.
Fig7
。
10. In fig8 ,
is tooth thickness.
i
ei
si
ri
Fig 8
A . ri B .pi C . ei
D si.
Part 2 (70 points)
O
11. Find all the ICs and Mark them on the Fig 9 （12
points）
Fig 9
12. Given a pair of involute external gear，reference center distance a＝152mm，tooth number of
driving gear Z1＝19，transmission ratio i12＝3，（12 points）
required to find ：
1）modules
2）diameter of reference circle in two gears
13. Fig 10 shows a crank rocker mechanism with quick return motion, crank AB is rotating with a
constant speed, the crank make completely rotation with 10 times in a minute, and rocker CD
spends 2 seconds in "return stroke"
Try to find out coefficient of travel speed variation and extreme position angle （12 points）
Fig 10
14. When given the length of three moving links, as followed fig 11:
lAB=25mm，lBC=40mm，lCD=30mm，AD is a frame。（12 points）
1）if it is a double crank mechanism，determine the range of lAD
2）if it is a crank rocker mechanism and AB is a crank，determine the range of lAD
Fig 11
15. Try to find out the DOF in Fig 12 （12 points）
Fig 12
16. In Fig 13, AB is a driving link, try to mark the pressure angle and transmission angle （10
points）
Fig 13
Answer sheet
Name:
Chines Name:
Student ID:
Nationality:
Answer for Part 1
Answer for Part 2