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The frame may get distorted to a parallelogram shape due to, multiple choice question is given below with detailed explanation:

### Q.The frame may get distorted to a parallelogram shape due to

(a) weight of vehicle
(b) weight of passengers
(c) cornering force
(d) wheel impact with road obstacle

Ans:  (d) wheel impact with road obstacle

Explanation

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#### Explanation:

The frame of a vehicle may get distorted to a parallelogram shape due to the impact of the wheels with a road obstacle. The force of hitting a road obstacle, such as a pothole, speed bump, or curb, can be powerful enough to cause significant damage to the frame.

When a vehicle’s wheels hit a road obstacle, the impact is transmitted through the suspension system and finally to the frame. The frame, which is responsible for providing structural support and maintaining the vehicle’s integrity, is designed to withstand various forces encountered during normal driving conditions. However, when the wheels encounter a sudden and significant impact, the frame may undergo deformation.

Fig: Jeep Frame

The impact force can cause the frame to bend or twist, resulting in a parallelogram shape. This distortion can be visually noticeable or may require closer inspection to identify. The severity of the distortion depends on factors such as the speed of the vehicle, the size and nature of the road obstacle, and the structural strength of the frame itself.

There are several reasons why a frame may get distorted to a parallelogram shape in such situations. One of the primary factors is the distribution of force. When a wheel hits a road obstacle, the force applied to the frame is not evenly distributed. Instead, it tends to concentrate on specific points of contact, leading to localized deformation. This uneven distribution of force can cause the frame to twist or bend in a non-uniform manner.

Another reason is the strength of the frame material. Different vehicles are constructed using various materials such as steel, aluminum, or carbon fiber. Each material has its own unique properties in terms of strength, rigidity, and elasticity. If the material used in the frame is not strong enough to withstand the impact forces, it may deform under the pressure, resulting in a parallelogram shape.

Additionally, the design and construction of the frame play a crucial role in its resistance to distortion. Frames that are poorly designed or lack adequate reinforcement in critical areas are more prone to deformation. In contrast, well-engineered frames with appropriate reinforcements are better equipped to handle impact forces and maintain their structural integrity.

It is essential to address frame distortion caused by wheel impacts promptly. Continuing to drive a vehicle with a distorted frame can have serious consequences. It can negatively affect the vehicle’s handling, stability, and overall safety. Moreover, a distorted frame may also lead to premature wear and tear of other components, such as suspension systems, tires, and steering mechanisms.

In conclusion, the frame of a vehicle may get distorted to a parallelogram shape due to the impact of the wheels with a road obstacle. This distortion occurs when the force of hitting the obstacle is powerful enough to deform the frame. Factors such as force distribution, material properties, and frame design contribute to this type of deformation. Promptly addressing frame distortion is important for maintaining vehicle safety and preventing further damage.

#### Read Supercharging of IC Engines MCQs

Question: What is one purpose of supercharging an engine?
a) To reduce the weight per horse power of the engine.
b) To reduce the space occupied by the engine.
c) To maintain the power of the engine even at high altitudes.
d) To improve power in a racing car.

Ans:  (d) wheel impact with road obstacle       Answer: c) To maintain the power of the engine even at high altitudes.

Question: What effect does a supercharger have on the air-fuel mixture?
a) It reduces fuel consumption.
b) It produces better mixing of the air-fuel mixture.
c) It increases fuel vaporization.
d) It suppresses detonation in a diesel engine.

Answer: b) It produces better mixing of the air-fuel mixture.

Question: What is the drawback of the higher temperature caused by compression in the supercharger?
a) Decreased fuel vaporization.
b) Increased charge density.
c) Reduced density of the charge.
d) Decreased likelihood of detonation.

Answer: c) Reduced density of the charge.

Question: Where does the power required to drive the supercharger come from?
a) Engine.
b) Exhaust system.
c) Battery.
d) Fuel injection system.

Question: What are the three methods used to increase air supply for combustion in a gasoline engine?
a) Increasing piston displacement, running the engine at high speeds, increasing the density of the charge.
b) Increasing engine weight, increasing fuel injection, increasing valve timing.
c) Increasing exhaust flow, increasing spark plug temperature, increasing the compression ratio.
d) Increasing fuel supply, reducing friction, improving valve design.

Answer: a) Increasing piston displacement, running the engine at high speeds, increasing the density of the charge.

Question: Which method introduces cooling problems and weight increase in the engine?
a) Increasing piston displacement.
b) Running the engine at high speeds.
c) Increasing the density of the charge.
d) Supercharging with a supercharger.

Question: How does proper valve timing and suction manifold design contribute to natural supercharging?
a) By increasing fuel vaporization.
b) By increasing charge density.
c) By increasing air intake due to charge inertia.
d) By reducing friction losses.

Answer: c) By increasing air intake due to charge inertia.

Question: Why is natural supercharging through increased engine speed rarely used?
a) It increases fluid friction.
b) It reduces mechanical friction losses.
c) It improves fuel efficiency.
d) It decreases engine energy absorption.

Answer: a) It increases fluid friction.

Question: What is the commonly used method for supercharging an engine?
a) Increasing piston displacement.
b) Running the engine at high speeds.
c) Increasing the density of the charge.
d) Using a supercharger.