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Chapter:

1. External diameter of clutch facing is limited to 120 mm and inner diameter may be assumed to be 0.3 times external diameter. Assume uniform wear ory. What is effective mean radius?

68 58 98 78

78

External diameter = 120 mm. Given Internal diameter = 0.3*external diameter = 0.3 * 120 = 36 mm. Effective mean diameter = (120 + 36) / 2 = 78 mm ? Effective mean radius = 39 mm.

Hint Answer

2. The clutch plate has 160 mm inside and 240 mm outside diameter. The total force provided by springs is 5 kN, when clutch is new. The coefficient of friction is 0.4. What is torque transmitted?

300 Nm 350 Nm 400 Nm 450 Nm

400 Nm

inside radius = 80 mm, outside radius = 120 mm ⇒ Effective mean radius = R = (80 + 120) / 2 = 100 mm. Let W = 5 kN = 5000 N and μ = coefficient of friction = 0.4. Torque transmitted = 2 * μ * W * R = 2 * 0.4 * 5000 * 100 = 400 * 10³ Nmm = 400 Nm.

Hint Answer

3. Which of following contains no linkage between clutch and pedal?

Clutch – by – wire Wet clutch Hydraulic single plate clutch Hydraulic multi-plate clutch

Clutch – by – wire

In clutch – by – wire system, re is no mechanical linkage between clutch and pedal. The ECU and actuator control clutch pedal.

Hint Answer

4. Where is clutch located?

Between transmission and engine Between transmission and rear axle Between transmission and propeller shaft Between transmission and differential

Between transmission and engine

The clutch is in middle of transmission and engine. So that torque can be transmitted from engine to transmission whenever required.

Hint Answer

5. Which of following parts of cover assembly that hold pressure plate against clutch plate?

Springs Thrust bearings Struts Lever

Springs

Springs hold pressure plate against clutch plate so that pressure can be exerted against clutch plate and better power transmission can be obtained.

Hint Answer

6. Which of following is coefficient of friction of clutch plate?

1.3 0.8 0.4 0.1

0.4

The coefficient of friction is always less than 1. Most commonly used material for clutch plate is ceramic in case of racing cars, heavy loads, etc.

Hint Answer

7. The external radius of cone clutch is 120 mm and internal radius is 80 mm. The cone angle is kept at 20°. What is effective mean radius assuming uniform wear ory?

292 mm 295 mm 100 mm 150 mm

292 mm

r_i = 80 mm, r₀ = 120 mm and ? = 20°. Effective mean radius = (r_i + r_o) / (2*Sin(&ta;)) = (80 + 120) / (2 * Sin(20°)) = 292.3 mm.

Hint Answer

8. Which of following is disadvantage of cone clutch?

It becomes difficult to disengage the clutch when the cone angle is less than 20° It is silent in operation The normal force on the contact surface is larger than the axial force Same torque can be transmitted for the same size as the plate clutch

It becomes difficult to disengage the clutch when the cone angle is less than 20°

When cone angle of cone clutch is less than 20° than male part of clutch join female part and it difficult to disengage clutch.

Hint Answer

9. The dry clutch can tolerate longer engagement time than a wet clutch.

True False

False

Since metal to oil heat transfer is more effective than metal to air, wet clutch acts as a much better heat exchanger and wet clutch can tolerate longer engagement time.

Hint Answer

10. In which type of manual transmission double-declutching is used?

Constant-mesh gearbox Sliding mesh gearbox Synchromesh gearbox Epicyclical gearbox

Constant-mesh gearbox

The double-declutching is used in constant-mesh gearbox. For smooth engagement of dog clutch, speed of main shaft and layshaft should be same.

Hint Answer

Nexttt

All Chapters

View all Chapter and number of question available From each chapter from Automobile-Engineering

Introduction

Internal Combustion Engines

Internal Combustion Engines

Engine Construction, Wheel Assembly

Engine Construction & Wheel Assembly

Combustion in CEngines

Combustion in S& CEngines

Fuels & Supercharging of IEngines

Fuels & Supercharging of IEngines

Fuel Supply System

Fuel Supply System

Cooling & Lubrication Systems

Cooling & Lubrication Systems

Chassis & Transmission System

Chassis & Transmission System

Steering & Front Axle

Steering & Front Axle

Braking System

Automotive Electrical System

Automotive Electrical System

Alternative Energy Sources

Alternative Energy Sources

Emission Control Methods, Electric & Conventional Vehicles

Emission Control Methods, Electric & Conventional Vehicles

Automotive Electronics, Engine Performance Parameter & Testing of Automobile Engines

Automotive Electronics, Engine Performance Parameter & Testing of Automobile Engines

Nonconventional Engines, Conventional Energy Sources & Cooling System

Nonconventional Engines, Conventional Energy Sources & Cooling System

Topics

This Chapter consists of the following topics

Chassis & Transmission System

External diameter of clutch facing is limited to 120 mm and inner diameter may be assumed to be 0.3 times external diameter. Assume uniform wear ory. What is effective mean radius?

The clutch plate has 160 mm inside and 240 mm outside diameter. The total force provided by springs is 5 kN, when clutch is new. The coefficient of friction is 0.4. What is torque transmitted?

Which of following contains no linkage between clutch and pedal?

Where is clutch located?

Which of following parts of cover assembly that hold pressure plate against clutch plate?

Which of following is coefficient of friction of clutch plate?

The external radius of cone clutch is 120 mm and internal radius is 80 mm. The cone angle is kept at 20°. What is effective mean radius assuming uniform wear ory?

Which of following is disadvantage of cone clutch?

The dry clutch can tolerate longer engagement time than a wet clutch.

In which type of manual transmission double-declutching is used?

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