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## Workshop Calculation and Science

#### Module 1 - Friction

1 : Which is the law of friction?
A : Friction force is independent over the area and shape of contacting surfaces
B : Frictional force is inversely proportional to the normal reaction
C : Frictional force acts in the same direction of motion
D : Frictional force is not a dependent on nature of contacting surface

2 : What is the direction of frictional force against a motional object?
A : Inclined to the object

B : Opposite to the object
C : Parallel to the object
D : Perpendicular to the object

3 : Which force is directly proportional to the normal reaction between contacting surfaces?
A : Pulling force
B : Pushing force

C : Frictional force
D : Allied force

4 : Which one of the following acts in between the wheels and roads, if vehicles are able to run on roads?

A : Friction
B : Corrosion
C : Erosion
D : Motion

5 : Which is useful friction?
A : Rings in the cylinder
B : Crank shaft bearings
C : Wheel hub bearings

D : Brake shoe lining

6 : Which is wasteful friction?
A : Rear axle gear
B : Tyres on the floor
C : Brake shoe lining
D : Clutch lining

7 : Which is depends on the frictional force?
A : Type of metals

B : Contact surfaces
C : Quantity of the contacting metals
D : Quality of metals

8 : How co-efficient of friction is expressed?
A : It is expressed as the ratio of force and area

B : It is the ratio between frictional force and normal reaction
C : It is the ratio between normal reaction and the mass of the object
D : It is expressed as the ratio of weight and normal reaction

9 : What is the formula to find co-efficient of friction?
A : μ = FxW
B :
C :

D :

10 : Which symbol is used to denote co-efficient of friction?
A : α (Alpha)

B : μ (Meu)
C : β (Beta)
D : γ (Gamma)

11 : What kind of friction is called if two objects are in contact at rest?
A : Sliding friction
B : Rolling friction

C : Static friction
D : Angular friction

12 : Which is the correct statement?
A : Limiting friction is equal to sliding friction
B : Rolling friction is more than the sliding friction

C : Sliding friction is always less than limiting friction
D : Limiting friction is always less than sliding friction

13 : What is the formula to find the force if the object is just move up the plane?
A :

B :
C :
D :

14 : Which of the angle is called angle of friction?
A : Angle - FOS

B : Angle - ROS
C : Angle - POS
D : Angle - ROF

15 : What is the co-efficient of friction if the angle of friction isq?
A : Sin θ
B : Cos θ

C : Tan θ
D : Cot θ

16 : What denotes the letter ʹRʹ in the given figure?
A : Force
B : Resistance

D : Normal reaction

17 : What is the purpose of a lubricant?
A : To increase the pressure
B : To increase friction

C : To reduce friction
D : To reduce pressure

18 : What type of lubricant is used in wick feed lubrication system

A : Lub-oil
B : Grease
C : Coolant
D : Cutting oil

19 : Which lubrication system is provided with a ring oiler to splash lub-oil continuously around the parts?
A : Gravity feed system
B : Pressure feed system

C : Splash feed system
D : Force feed system

20 : Which one is the three types of lubrication system in general use?
A : Force feed system, speed feed system, frictional feed system
B : Velocity feed system, Speed feed system, Frictional feed system

C : Gravity feed system, force feed system, splash feed system
D : Splash feed system, Frictional force system, Speed feed system

21 : Which lubrication system employs oil holes in the machines?

A : Gravity feed system
B : Force feed system
C : Splash feed system
D : Velocity feed system

22 : What is the name of the lubrication system?
A : Oil cup

B : Wick feed
C : Manual screw down
D : Ring oiling

23 : Which is used to reduce the friction in machine parts?
A : Kerosene
B : Petrol
C : Water

D : Lubricants

24 : Which is the main purpose of using the lubricant oil in engine moving parts
A : To increase the efficiency

B : To reduce friction
C : To improve carrying capacity
D : To improve the durability

25 : Which is the correct statement?

A : Lubricants acts to prevent corrosion
B : Lubricants acts as a seal
C : Lubricants acts as a fuel
D : Lubricants acts as a filter

26 : What causes the efficiency of a machine by maintaining the lubrication?

A : Increases
B : Decreases
C : Remains same
D : Does not affected

27 : What is the name of the instrument used for lubrication?
A : Oil -can
B : Automatic hydraulic - Type pressure gun

C : T-handle pressure gun
D : Pressure grease gun

28 : Which principle of lubrication can be employed?
A : Pressure feed system
B : Splash feed system

C : Gravity feed system
D : Force feed system

29 : Which way the coolant acts as a lubricant?
A : To carry away dust

B : To carry away the heat
C : To carry away moisture
D : To carry away dryness

30 : What is the force required to move a body of mass 1000 kg if the co-efficient of friction is 0.4 (assume 1kg = 10 N)?
A : 4000 N
B : 400 N
C : 40 N
D : 4 N

31 : What is the co-efficient of friction if a force of 30 N is required to move a body of mass 35 kg (Assume 1kg=10N)?
A : 8.57
B : 0.082

C : 0.0857
D : 0.0085

32 : How much force is required to move an object weights 20 kg, if the value of m = 0.24?

A : 4.8 kg
B : 83.33 kg
C : 1.2 kg
D : 0.48 kg

33 : What is weight of an object could be moved by a force of 30 kg if co-efficient of friction is 0.0125?
A : 80 kg
B : 2430 kg
C : 72000 kg

D : 2400 kg

34 : What is the angle of inclination if a weight of 150 kg is in equilibrium and the value of m is 0.5773?
A : 30°
B : 45°
C : 60°
D : 90°

35 : How much force is required to just slide a 20 kg object lying on a horizontal table if the m is 0.2?
A : 2 kg
B : 3 kg

C : 4 kg
D : 5 kg

36 : What is the force required to move a 20 kg object with a co-efficient of friction is 0.24?

A : 4.8 kg
B : 0.48 kg
C : 0.048 kg
D : 0.0048 kg

37 : What is co-efficient of friction for pulling a load of 400 kg by a force of 40 kg?
A : 0.01
B : 0.2

C : 0.1
D : 0.02

38 : How much will be the co-efficient of friction for moving a body of mass 80 kg by a force of 40 kg on a horizontal surface?
A : 0.05

B : 0.5
C : 0.65
D : 0.45

39 : How much will be the weight of a body which will be moved by a horizontal force of 50 kg against a frictional resistance of 0.25?
A : 150 kg

B : 200 kg
C : 250 kg
D : 300 kg

40 : What will be the approximate angle of inclination of an object if the co-efficient of friction m=0.84?
A : 60°
B : 45°

C : 40°
D : 30°

41 : What is the work done to move a body of mass 60 kg to a distance of 5 meters, if the coefficient if friction between body and the plane is 0.2?
A : 12 kg
B : 60 kg
C : 12 m-kg

D : 60 m-kg

42 : How much will be the work done in moving a 10 kg object resing on a horizontal plane through a distance of 10 meter (assume m= 0.15)?
A : 1.5 m-kg

B : 15 m-kg
C : 0.15 m-kg
D : 150 m-kg

43 : How much force is required to stop a vehicle of mass 1000 kg running on a road with coefficient of friction between the tyres and the road is 0.4?
A : 3000 kg
B : 450 kg
C : 350 kg

D : 400 kg

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