Questions & Answers Eng. Islam Al-Jarrah. 1 1211 10987 23 456 18 17 16151413 Eng. Islam Al-Jarrah

Brain StormingQuestions & Answers

Eng. Islam Al-Jarrah

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A is twice the large of B, Specify direction and speed

If A rotates once then B will rotate ………..

Q1

AnswerEng. Islam Al-Jarrah


A is twice the size of B. What is the speed, direction and number of

turns for B if A is the Driver.

Q2

Answer


Pulley A is twice pulley B, Pulley B is the Driver. What is the speed, direction, force and number

of turns?

Q3

Answer


Pulley "A" is half the size of pulley "B" and rotates a full circle twice.

What is the minimum weight that can hang from pulley "A" to just balance the 10kg mass hanging from pulley "B"?

How many times will pulley "A" make a full rotation?

Q4

Answer


Pulley "A" is connected to the shaft of a motor. The motor can generate enough force to just lift a 8kg mass off the ground. Pulley "A" rotates in the direction of the arrow.

Is the system of pulleys on the right sufficient to provide enough force to lift the 30kg mass off the ground?

Will the 30kg mass be lifted off the ground by the motor? Explain.

Q5

Answer


What is the force needed by the man to lift the 200 kg block?

Q6

Answer


What is the output in revolutions per minute at Gear C?

Hint: (Speed gear A * Number of teeth Gear A) = (Speed gear B * Number of teeth gear B)

Q7

Answer


What is the speed for Gear C, what is the direction?

What do we call Gear B?

Q8

Answer


Calculate the output speed (the speed at which the blue gear moves) if: V1= 3000 (Orange gear) and t1=20 teeth, T2 = 50 teeth and T3 = 200 teeth

Q9

Answer


In a compound gear, all gears are fixed on the same axel moving at the same speed.

This is an example of a “compound gear train”. Gear A rotates in a clockwise direction at 30 revs/min. What is the output in revs/min at D and what is the direction of rotation ?

TA=50, TB=20, TC=30, TD=10

Q10

Answer


What is the Gear Ratio if A is the Driver? What is the Gear Ratio if C is the driver? Which will have higher speed/force at the driven gear?

Q11

Answer


Which Gears are the Idler Gears? What is the purpose of the Idler Gear?

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Q14

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Q15

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Q18

Answer


Increase in speed if A is the driver

Same direction of rotation

B will rotate two turns as A turns once.

A1

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Opposite direction Different speed. A will rotate once

and B twice

A2

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Same direction of Rotation.

The speed of A is half the speed of B

The force used by A is double the force exerted by B.

A will rotate once when B rotates twice.

A3

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5 Kg. A will turn one time

A4

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Yes it is sufficient The force needed

by the motor will be less than 8

30/4 < 8 Yes it will be lifted

A5

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The effort needed will equal 50 since 200 / 4= 50.

4 is the number of ropes excluding the one connected to the effort.

A6

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60*20=10*S S=60*20/10=120 120REV/min

A7

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90*30=15*S S=90*30/15=180 S=180Rev/Min The Direction of C

will be the same as in A.

B is called an Idler.

A8

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3000*20=200*S S=3000*20/200 S=300

A9

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Direction of rotation will be the same at D & A

The speed is : C & D will have the

same speed so, 30*50=20*SB Sb=75Sc=75 So, 75*30=10*Sd Sd=225

A10

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When A is the Driver◦ GR=15/30=1/2

When C is the Driver:◦ GR=30/15=2

The first case will provide higher speed at the driven gear, but the second case will provide more force.

A11

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All the gears between the driver and the driven are called idlers and are used to make the driven gear rotate at the same direction of the Driver gear.

A12

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A13

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A14

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A15

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A16

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A18

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Questions & Answers Eng. Islam Al-Jarrah. 1 1211 10987 23 456 18 17 16151413 Eng. Islam Al-Jarrah