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Multiple choice physics pressure in fluids and atmospheric pressure hydraulic equipment applications of pascals law examples of hydraulic press

Principle of similitude forms the basis for:

  1. comparing two identical equipments

  2. designing models so that the result can be converted to prototypes

  3. hydraulic designs

  4. performing acceptance tests
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The principle of similitude is a supplement to the scientific method advocated by Lord Rayleigh that requires that any suggested scientific law be examined for its relationship to similar law.

This principle forms the basis for designing models so that the result can be converted to prototypes.
Hence, option B is correct.

Multiple choice physics pressure in fluids and atmospheric pressure hydraulic equipment applications of pascals law examples of hydraulic press
State True or False.
Hydraulic press is used in the extraction of oil from oil seeds.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Hydraulic press is used in extraction of oil from oil seeds by crushing.

The concept of the hydraulic press is based on Pascal's theory, which states that when pressure is applied on fluids in an enclosed system, the pressure throughout the system always remains constant. In simple words, a hydraulic press is a machine that makes use of the pressure exerted on the fluids to crush something.

Multiple choice physics pressure in fluids and atmospheric pressure hydraulic equipment applications of pascals law examples of hydraulic press

A hydraulic press contains 0.25 $m^3$ (250 L) of oil. Find the decrease in volume of the oil when it is subjected to a pressure increase $\Delta p \, = \, 1.6 \, \times \, 10^7$ ,Pa. The bulk modulus of the oil is $B \, = \, 5.0 \, \times \,10^9$ Pa.

  1. $-0.32 \%$
  2. $-1.32 \%$
  3. $-0.42 \%$
  4. $-1.42 \%$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The bulk modulus B is defined as B = -delta_p / (delta_V / V). Rearranging gives delta_V / V = -delta_p / B. Plugging in values: -(1.6 * 10^7) / (5.0 * 10^9) = -0.0032, which is -0.32%.

Multiple choice physics machines levers and pulleys pulley pulleys

In a single movable pulley, if the effort moves by a distance $x$ upwards, by what height is the load raised?

  1. $x/2$
  2. $x$
  3. $4x$
  4. $2x$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Load $L$ is attached to the movable pulley. A rope is fi xed at a point in ceiling that passes through the moveable pulley. 
In order to lift the effort $E$ by $ x$ meters, the load $L$ needs to 
Travel the distance of $ x/2$ meters. (The entire rope needs to be pulled by $E$ for a distance of $ x$) 
Now, Velocity Ratio equals (Distance traveled by $E$) divided by (Distance traveled by $L$) 
So it becomes : $ x/( x/2)$. This equals to 2
Since it is a ratio. it has no units of measurement. 
Multiple choice physics machines levers and pulleys pulley pulleys

What is the velocity ratio of a single movable pulley?

  1. $1$
  2. $0.5$
  3. $2$
  4. $1.5$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Load $L$ is attached to the movable pulley. A rope is fixed at a point in ceiling that passes through the movable pulley.
In order to lift the load $L$ by $X$ meters, the effort $E$ needs to travel the distance of 2X meters. (The entire rope needs to be pulled by $E$ for a distance of 2X.)
Now, Velocity Ratio equals (Distance traveled by $E$) divided by (Distance traveled by $L$)
So it becomes : $2X/X$. This equals to 2
Since it is a ratio. it has no units of measurement.

Multiple choice physics machines levers and pulleys pulley pulleys

A pulley makes our work easier by changing the direction of the force.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A fixed pulley is primarily used to change the direction of the applied force, making it easier to pull a load downwards rather than lifting it upwards.

Multiple choice physics common machines levers and pulleys pulley pulleys

Levers, inclined planes and pulleys are called:

  1. Compound machines

  2. Complex machines

  3. Easy machines

  4. Simple machines
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
  1. A simple machine is a mechanical device that changes the direction or magnitude of a force. In general, they can be defined as the simplest mechanisms that use mechanical advantage (also called leverage) to multiply force. Levers,inclined planes and pulleys are called simple machines