Question 1

Decide whether each of these statements is True (T)  or False
A belt drive is installed with an initial tension of 400 N in the belt. For a maximum permissible tight side tension of 500 N and the belt moving with a speed of 3 m/s:
(i)  The slack side tension will be 100 N.
(ii)  The maximum power that can be transmitted is 1200 J.

Accepted Answer

A)   (i)  T (ii)  T
B)   (i)  T (ii)  F
C)   (i)  F (ii)  T
D)   (i)  F (ii)  FE) A) and C)
F) A) and B) D

Question 2

In a simple machine which has a velocity ratio of 8 and the law giving the relationship between the effort E and load F is E = 0.2F + 0.25 N, the effort required to overcome friction is:

Accepted Answer

A)   0.2 kN
B)   0.25 kN
C)   1.6 kN
D)   4.0 kNE) B) and C)
F) B) and D) B

Question 3

In a simple machine which has a velocity ratio of 8 and the law giving the relationship between the effort E and load F is E = 0.2F + 0.25 N, the limiting efficiency is:

Accepted Answer

A)   0.2
B)   0.25
C)   0.5
D)   0.63E) A) and B)
F) A) and C)

Question 4

Decide whether each of these statements is True (T)  or False
A 100% efficient gear system has a gear ratio of 3 to 1. When a torque of 200 N is applied and the input
Shaft rotates at 20 rev/s:
(i)  The output shaft rotates at 30 rev/s.
(ii)  The output shaft torque is 600 N m.

Accepted Answer

A)   (i)  F (ii)  F
B)   (i)  T (ii)  T
C)   (i)  T (ii)  F
D)   (i)  F (ii)  TE) A) and C)
F) All of the above

Question 5

A screw jack has a screw with a pitch of 12 mm and a jack handle with a radius of rotation of 0.4 m. If the load to be lifted by the jack is 10 kN, the effort that must be applied to the jack handle is:

Accepted Answer

A)   47.6 N
B)   95.6 N
C)   191.2 N
D)   300 NE) None of the above
F) C) and D) A

Exam 12: Mechanical Power Transmission

Correct Answer
verified
D

In a simple machine which has a velocity ratio of 8 and the law giving the relationship between the effort E and load F is E = 0.2F + 0.25 N, the effort required to overcome friction is:

Correct Answer
verified
B

In a simple machine which has a velocity ratio of 8 and the law giving the relationship between the effort E and load F is E = 0.2F + 0.25 N, the limiting efficiency is:

Correct Answer
verified

Decide whether each of these statements is True (T) or False A 100% efficient gear system has a gear ratio of 3 to 1. When a torque of 200 N is applied and the input Shaft rotates at 20 rev/s: (i) The output shaft rotates at 30 rev/s. (ii) The output shaft torque is 600 N m.

Correct Answer
verified

A screw jack has a screw with a pitch of 12 mm and a jack handle with a radius of rotation of 0.4 m. If the load to be lifted by the jack is 10 kN, the effort that must be applied to the jack handle is:

Correct Answer
verified
A

Exam 12: Mechanical Power Transmission

Correct AnswerverifiedD

In a simple machine which has a velocity ratio of 8 and the law giving the relationship between the effort E and load F is E = 0.2F + 0.25 N, the effort required to overcome friction is:

Correct AnswerverifiedB

In a simple machine which has a velocity ratio of 8 and the law giving the relationship between the effort E and load F is E = 0.2F + 0.25 N, the limiting efficiency is:

Correct AnswerverifiedShow Answer

Decide whether each of these statements is True (T) or False A 100% efficient gear system has a gear ratio of 3 to 1. When a torque of 200 N is applied and the input Shaft rotates at 20 rev/s: (i) The output shaft rotates at 30 rev/s. (ii) The output shaft torque is 600 N m.

Correct AnswerverifiedShow Answer

A screw jack has a screw with a pitch of 12 mm and a jack handle with a radius of rotation of 0.4 m. If the load to be lifted by the jack is 10 kN, the effort that must be applied to the jack handle is:

Correct AnswerverifiedA

Correct Answer
verified
D

Correct Answer
verified
B

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
A