# Impact of Jets and Jet Propulsion MCQs - Fluid Mechanics

Impact of Jets and Jet Propulsion MCQs - Fluid Mechanics: This section contains the multiple-choice questions and answers on the fluid mechanics chapter Dimensional and Model Analysis. practice these MCQs to learn and enhance the knowledge of Dimensional and Model Analysis.

## List of Fluid Mechanics - Impact of Jets and Jet Propulsion MCQs

1. What is the direction of the force exerted by a jet on a stationary vertical plate?

1. Opposite to the jet's direction
2. Perpendicular to the plate
3. Inclined at 45 degrees to the plate
4. Parallel to the plate

Answer: B) Perpendicular to the plate

Explanation:

The force exerted by the jet is normal (perpendicular) to the plate's surface.

2. Which factor does not affect the force exerted by a fluid jet on an inclined flat plate?

1. Jet velocity
2. Plate's length
3. Fluid density
4. Plate's color

Answer: D) Plate's color

Explanation:

The color of the plate does not affect the force exerted by the fluid jet; the other factors listed are relevant.

3. When a jet of fluid impacts a stationary curved surface, the force exerted by the jet can be resolved into which two components?

1. Radial force and tangential force
2. Axial force and transverse force
3. Shear force and normal force
4. Inertial force and gravitational force

Answer: A) Radial force and tangential force

Explanation:

The force exerted by the jet can be resolved into components along the radial and tangential directions.

4. When the jet impacts a flat plate, what is the direction of the resultant force?

1. Opposite to the jet's direction
2. Normal to the plate's surface
3. Along the plate's edge
4. Parallel to the plate's surface

Answer: B) Normal to the plate's surface

Explanation:

The resultant force is directed normally to the flat plate's surface.

5. What is the SI unit of force used to measure the force exerted by a jet on a hinged plate?

1. Newton (N)
2. Pascal (Pa)
3. Joule (J)
4. Kilogram (kg)

Answer: A) Newton (N)

Explanation:

The force is measured in Newtons (N).

6. When a jet of air strikes a flat plate moving in the same direction as the jet, the force exerted on the plate is:

1. Negative
2. Zero
3. Positive
4. Cannot be determined

Explanation:

When the plate moves in the same direction as the jet, there is no relative motion, resulting in zero force

7. Which property of the water jet is crucial in determining the direction of the force on the vanes?

1. Jet color
2. Jet pressure
3. Jet velocity
4. Jet temperature

Answer: C) Jet velocity

Explanation:

The direction and magnitude of the force depend on the velocity of the water jet.

8. When a jet engine produces thrust, which Newton's law explains the reaction to this force?

1. Newton's Third Law
2. Newton's Second Law
3. Newton's First Law
4. Bernoulli's Law

Answer: C) Newton's First Law

Explanation:

The basic concept behind thrust in jet propulsion is Newton's Third Law, which states that for every action, there is a comparable and opposite reaction.

9. What is the primary advantage of using jet propulsion in ships?

1. High fuel efficiency
2. Reduced noise
3. Improved maneuverability
4. Lower maintenance costs

Answer: C) Improved maneuverability

Explanation:

Jet propulsion allows for better maneuverability due to directional control of the water jet

10. What is the primary disadvantage of using jet propulsion for large cargo ships?

1. High fuel consumption
2. High maintenance costs
3. Low maneuverability
4. Limited speed

Answer: A) High fuel consumption

Explanation:

Jet propulsion can be less fuel-efficient for large cargo ships, leading to higher fuel consumption.