# The friction at the track is proportional to?

The friction at the track is proportional to speed.

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Description : Draw and explain pneumatic proportional controller.

Last Answer : Explanation : Basic : Proportional control is one in which the process input is change in direct proportion to the error(t) controls the output so that the manipulated variable and the error has proportional relation. ... the MV and SP reference value called as error Given as :  Error = SP - MV

Description : Is the speed of alternator is directly proportional to frequency?

Last Answer : Yes, speed of alternator is directly proportional to frequency.

Description : What helps sore leg muscles?

Last Answer : heat pack and some ice if the joints swell

Description : What is Friction?

Last Answer : Friction is the force that opposes the relative motion or tendency to such motion of two bodies in contact. If we try to push a block of wood across a table, there are two opposing forces ... table) the object moves further and further before stopping. This demonstrates Galileo's law of inertia too.

Description : We often sprinkle talcum powder on the carom board . This is done to reduce ______ between the board and the striker. a) friction b)movement c)speed d)contact

Description : ________ is a substance that can reduce the force of friction between the two surface in contact. a) lubricant b)paste c)water d)push

Description : A ball bearing is used in shafts of motors, dynamos to reduce ______. a) movement b)friction c)speed d)none

Description : The skidding of vehicle on snow is because of very little _______. a) pull b)friction c)push d)none

Last Answer : They change the direction  of the objects  They change the size of the objects

Description : Describe with neat diagram air friction damping.

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Description : The friction losses in Real Transformers are :  (A) 0% (B) 5% (C) 25% (D) 50%

Description : Kinetic friction is the?

Last Answer : Kinetic friction is the friction force acting when the body is in motion.

Description : Tangent of angle of friction is equal to?

Last Answer : Tangent of angle of friction is equal to coefficient of friction.

Description : Dynamic friction as compared to static friction is?

Last Answer : Dynamic  friction  is   less  compared  to  static  friction.

Description : Coulomb friction is the friction between?

Last Answer : Coulomb friction is the friction between bodies having relative motion.

Description : Limiting force of friction is the?

Last Answer : Limiting force of friction is the friction force acting when the body is just about to move.

Description : Coefficient of friction is the?

Last Answer : Coefficient of friction is the ratio of limiting friction and normal reaction.

Description : On the ladder resting on the ground and leaning against a smooth vertical wall, the force of friction will be?

Last Answer : On the ladder resting on the ground and leaning against a smooth vertical wall, the force of friction will be zero at its upper end.

Description : On a ladder resting on smooth ground and leaning against vertical wall, the force of friction will be?

Last Answer : On a ladder resting on smooth ground and leaning against vertical wall, the force of friction will be upwards at its upper end.

Description : The ratio of limiting friction and normal reaction is known as?

Last Answer : The ratio of limiting friction and normal reaction is known as coefficient of friction.

Description : The coefficient of friction depends on?

Last Answer : The coefficient of friction depends on nature of surface.

Description : Angle of friction is the?

Last Answer : Angle of friction is the angle between normal reaction and the resultant of normal reaction and the limiting friction.

Description : Air resistance ______ with an increase in the speed of the object moving through it. a) increases b)decreases c)remains same d)no change

Description : Liquid pressure at any point inside the liquid, depends upon _______of the liquid and the height of liquid column above that point. a) area b)density c)weight d)none

Description : A uniform cylinder of weight W is rolling while slipping on a rough horizontal surface under the influence of a horizontal force. The force of friction between the cylinder and the surface is a. ... c.Indeterminate d.Determinate but depends on the acceleration of the cylinder e.None of the above

Description : A uniform cylinder of weight W is rolling while slipping on a rough horizontal surface under the influence of a horizontal force. The force of friction between the cylinder and the surface is a. ... on the acceleration of the cylinder d.107 dynes e.Proportional to the coefficient of static friction

Last Answer : c. Determinate but depends on the acceleration of the cylinder

Description : Angle of friction and angle of repose are (1) Equal to each other (2) Not equal to each other (3) Proportional to each other (4) None of the above

Last Answer : (1) Equal to each other Explanation: The angle of repose or the critical angle of repose, of a granular material is the steepest angle of descent or dip of the slope relative to the horizontal ... the density, surface area and shapes of the particles, and the coefficient of friction of the material.

Description : A sliding contact bearing is operating under stable condition. The pressure developed in oil film is p when the journal rotates at N rpm. The dynamic viscosity of lubricant is μ and effective coefficient of ... to p and f) (d) f is directly proportional to μ and inversely proportional to N

Last Answer : (b) f is directly proportional to μ and N

Description : Incorrect statement for co-efficient of friction could be that A. The coefficient of friction is denoted by the Greek letter µ. B. The coefficient of friction is directly proportional to ... D. The coefficient of friction is inversely proportional to the force pressing the surfaces together

Last Answer : The coefficient of friction is constant even in the conditions of fast slipping and high contact pressure

Description : Which of the following statements are TRUE for damped vibrations? (P) . For a system having critical damping, the value of the damping ratio is unity and system does not undergo a vibratory motion. (Q) . Logarithmic decrement method ... Q only (B) P and S only (C) P, Q and R only (D) Q and S only

Last Answer : (C) P, Q and R only

Description : The friction factor is (A) Always inversely proportional to the Reynolds number (B) Not dimensionless (C) Not dependent on the roughness of the pipe (D) None of these

Last Answer : (D) None of these

Description : Pick out the correct statement. (A) Fanning friction factor is inversely proportional to Reynolds number always (B) The property of a randomly packed bed (with raschig rings) is given by the ratio of the ... the ratio of the speed of the fluid to that of sound in the fluid under conditions of flow

Last Answer : (D) Mach number is given by the ratio of the speed of the fluid to that of sound in the fluid under conditions of flow

Description : Fanning friction factor for laminar flow of fluid in a circular pipe is (A) Not a function of the roughness of pipe wall (B) Inversely proportional to Reynolds number (C) Both (A) & (B) (D) Neither (A) nor (B)

Last Answer : (C) Both (A) & (B)

Description : Pick up wrong statement about friction force for dry surfaces. Friction force is  (A) Proportional to normal load between the surfaces  (B) Dependent on the materials of contact surface  (C) Proportional to velocity of sliding  (D) Independent of the area of contact surfaces

Last Answer : (C) Proportional to velocity of sliding

Description : The passive earth pressure of a soil is proportional to (where is the angle of internal friction of the soil.) (A) tan (45° - ) (B) tan (45° + ) (C) tan2 (45° - ) (D) tan2 (45° + )

Last Answer : (D) tan2 (45° + )

Description : he lateral earth pressure on a retaining wall (A) Is equal to mass of the soil retained (B) Proportional to the depth of the soil (C) Proportional to the square of the depth of the soil (D) Proportional to the internal friction of the soil

Last Answer : (D) Proportional to the internal friction of the soil

Description : The active earth pressure of a soil is proportional to (where is the angle of friction of the soil) (A) tan (45° - ) (B) tan2 (45° + /2) (C) tan2 (45° - /2) (D) tan (45° + )

Description : The earth pressure of a soil at rest, is proportional to (where is the angle of internal friction of the soil) (A) tan (45° - ) (B) tan (45° + ) (C) tan2 (45° - ) (D) None of these

Description : The shear strength of a soil (A) Is directly proportional to the angle of internal friction of the soil (B) Is inversely proportional to the angle of internal friction of the soil (C) Decreases with increase in normal stress (D) Decreases with decrease in normal stress

Description : Which one of the following statements is not correct with respect to PSC beams? (a) Loss due to shrinkage is proportional to water-cement ratio used in concrete (b) Loss due to creep is ... to the modulus of elasticity of concrete (d) Loss due to friction occurs in post tensioned concrete members

Last Answer : (c) Loss due to elastic deformation is directly proportionally to the modulus of elasticity of concrete

Description : Angle of friction and angle of repose are (1) equal to each other (2) not equal to each other (3) proportional to each other (4) None of the above

Last Answer : equal to each other

Description : A cyclist moves uniformaly on a horizontal circular track of radius 100 m . If the cofficient of friction is 0.1. At which of the following speed (s)

Last Answer : A cyclist moves uniformaly on a horizontal circular track of radius 100 m . If the cofficient of friction is 0.1. ... m/s C. 14 m/s D. none of these

Description : A freight car weighing 20 tons and moving at a speed of 7 miles per hour on a horizontal track collides and couples with a stationary car that weighs 15 tons. Neglecting friction, determine the velocity of the coupled cars.

Description :  lumen / watt is the unit of: A) light flux B) luminous intensity C) brightness D) luminous efficiency