Question 1

Machine is a device used to overcome the __________.

Accepted Answer

Load

Answer

V.R.

Answer

M.A.

Answer

Effort

Question 2

Which statement is not true for the machine?

Accepted Answer

Its output can be more than input.

Answer

It can Change the direction of applied force

Answer

It can increase speed

Answer

It can multiply force

Question 3

Which of the statements is not true for an actualmachine?

Accepted Answer

M.A > V.R

Answer

Its efficiency is always less than 100%

Answer

Output of the machine is always less than input.

Answer

Its mechanical advantages is less thanvelocity ratio

Question 4

Which of the statements is not true for an Idealmachine?

Accepted Answer

M.A ＜ V.R

Answer

𝞰=100 %

Answer

M.A = V.R

Answer

Work output = Work Input

Question 5

The correct relationship between the effort (E), load(L) and M. A is :

Accepted Answer

M.A. X E = L

Answer

M.A = L X E

Answer

M.A X L = E

Answer

None of these

Question 6

The correct relationship between velocities (V.R), the distance through which effort act (𝑑_𝐸)and the distance through which load(𝑑_𝐿) moves.

Accepted Answer

V.R X 𝑑_𝐿= 𝑑_𝐸

Answer

None of these

Answer

V.R = 𝑑 _𝐸X 𝑑_L

Answer

V.R X 𝑑_𝐸 = 𝑑_L

Question 7

A machine is 80 % efficient ;What does this imply?

Accepted Answer

80 % of the total energy supplied to the machine at the effort point is obtained as useful energy at the load point.

Answer

𝞰 > 1

Answer

M.A > V

Answer

80 % of the total energy supplied to the machine at the load point is obtained as useful energy at the effort point.

Question 8

The point at which the energy is supplied to amachine by applying the effort is:

Accepted Answer

Effort Point

Answer

M.A

Answer

Load point

Answer

Output energy

Question 9

The point where the energy is obtained byovercoming the load is:

Accepted Answer

Load point

Answer

Output point

Answer

V.R

Answer

Input point

Question 10

Relationship between 𝞰 , M.A and V.R:

Accepted Answer

a

Answer

d

Answer

b

Answer

c

Question 11

Output Energy is equal to:

Accepted Answer

Load X Displacement of the point of application of load

Answer

Effort X Displacement of the point of application of load

Answer

Effort X Displacement of the point of application of effort

Answer

Load X Displacement of the point of application of effort

Question 12

Input Energy is of Machine is:

Accepted Answer

Effort X Displacement of the point of application of effort

Answer

Load X Displacement of the point of application of effort

Answer

Load X Displacement of the point of application of load

Answer

Effort X Displacement of the point of application of load

Question 13

A machine is 80 % efficient; what does thisimply?

Accepted Answer

All the above

Answer

$\frac{𝑀.𝐴}{V.R}=0.8$

Answer

The remaining 20 % of the energy supplied is lost in overcoming the force of friction

Answer

It appears as heat energy in different parts of the machine

Question 14

A machine in which the displacement of load is more than the displacement of effort Will have:

Accepted Answer

V.R ＜ 1

Answer

V.R > 1

Answer

V.R = 1

Answer

M.A < 1

Question 15

A machine in which the displacement of load isless than the displacement of effort Will have :

Accepted Answer

V.R > 1

Question 16

A machine having M.A > 1 acts as a force multiplier.

Accepted Answer

True

Answer

False

Question 17

A machine having M.A < 1 acts as a Velocity multiplier.

Accepted Answer

True

Answer

False

Answer

Can be both.

Answer

None of the above

Question 18

A machine having M.A < 1 acts as a Force multiplier.

Accepted Answer

False

Answer

True

Answer

Can be both.

Answer

None of the above

Question 19

In machine if the displacement of load is equal to thedisplacement of effort:

Accepted Answer

Used to change the direction of effort

Answer

Act as speed multiplier

Answer

Act as force multiplier

Answer

None of the above

Question 20

The Block and Tackle system, has V.R= 4 and efficiency =75% Find M.A

Accepted Answer

3

Answer

4

Answer

2.5

Answer

2

Question 21

A fixed pulley is driven by 100kg mass and lifts the load of 75 kgf. Calculate: The efficiency of the pulley.

Accepted Answer

0.75

Answer

0.80

Answer

1

Answer

0.85

Question 22

A single fixed pulley is used because it:

Accepted Answer

Helps to apply the effort in a convenient direction

Answer

Has the Mechanical advantages greater than 1

Answer

Has the efficiency 100%

Answer

Has the velocity ratio less than 1

Question 23

Observe the diagram and write V.R and M.A if the efficiency is 80 %.

Accepted Answer

V.R = 4 and M.A = 3.2

Answer

V.R = 4 and M.A = 3.6

Answer

V.R = 4 and M.A = 3.4

Answer

V.R = 4 and M.A = 4

Question 24

Observe the diagram and write the V.R and M.A.

Accepted Answer

V.R = 2 and M.A = 2

Answer

V.R = 1 and M.A = 1

Answer

V.R = 1 and M.A = 2

Answer

V.R = 2 and M.A = 1

Question 25

A pulley system has three pulleys. A load of 120 N is overcome by applying an effort 50 N. Calculate the Mechanical advantages and efficiency of this system.

Accepted Answer

η = 80 % & M.A = 2.4

Answer

η = 80 % & M.A = 3.2

Answer

η = 70 % & M.A = 2.3

Answer

η = 70 % & M.A = 2.4

Question 26

The efficiency of lifting the machine is the ratio of

Accepted Answer

All of the above

Answer

Work done by the machine to work done on themachine

Answer

M.A to V.R

Answer

Output to the input

Question 27

There is a machine in which the V.R is 4 and M.A is nearly 4. If the friction in machine increases :

Accepted Answer

M.A Will decrease

Answer

V.R and M.A will remain same

Answer

V.R will decrease

Answer

M.A will increase

Question 28

The diagram shows a single pulley system when a load of 20 Kgf is attached to it. If efficiency is 80 % calculate effort applied.

Accepted Answer

12.5 Kgf

Answer

12.5 N

Answer

20 N

Answer

12.0 Kgf

Question 29

A pulley system in block and tackle system has 5pulleys in all. Its velocity ratio is :

Accepted Answer

5

Answer

More than 5

Answer

None of these

Answer

Less than 5

Question 30

A pulley system has 4 pulley in all and is 60 % efficientCalculate the effort required to lift 1200N

Accepted Answer

500 N

Answer

450 N

Answer

350 N

Answer

550 N.

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