Description : The function of ball bearings in a wheel is – (1) to increase friction (2) to convert kinetic friction into rolling friction (3) to convert static friction into kinetic friction (4) just for convenience
Last Answer : (2) to convert kinetic friction into rolling friction Explanation: A ball bearing is a type of rollingelement bearing that uses balls to maintain the separation between the bearing races. The purpose of a ball bearing is to reduce rotational friction and support radial and axial loads.
Description : Ball bearings are used in cycles, scooters etc. to _____. A. Reduce the friction between the wheel and the axle B. Increase the friction between the wheel and the axle C. Reduce the friction between ground and the wheel D. None of these
Last Answer : ANSWER: A
Description : Friction can be reduced by changing over from _____. A. Sliding to rolling B. Dynamic to static C. Potential energy to kinetic energy D. Rolling to sliding
Description : Ball "A" ROLLS down an inclined plane without slipping. An identical ball, Ball "B", SLIDES down the same inclined plane without rolling. Which of the following statements is true? w) Ball ... y) their kinetic energies are the same z) their rotational kinetic energies are equal just after release
Last Answer : ANSWER: Y -- THEIR KINETIC ENERGIES ARE THE SAME
Description : The maximum frictional force which comes into play when a body just begins to slide over the surface of another body is known as a.Kinetic friction b.Rolling friction c.Dynamic friction d.Limiting friction e.Sliding friction
Last Answer : d. Limiting friction
Description : The rolling contact bearings as compared to sliding contact bearings have (a) small overall dimensions (b) accuracy of shaft alignment (c) low starting and low running friction except at very high speeds (d) all the mentioned
Last Answer : (d) all the mentioned
Description : Kinetic friction is always A. lesser than static friction B. greater than static friction C. equal to static friction D. equal to contact force
Last Answer : lesser than static friction
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
Last Answer : c. Indeterminate
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 : When removing ball or roller bearings from the shaft of a motor, you should use a _____________. A. rawhide hammer B. brass mallet C. wheel puller D. soft iron pry bar
Last Answer : Answer: C
Description : The only point in the steering stand shown in the illustration which needs periodic lubrication is the ______________. EL-0098 A. repeater assembly ball bearings B. steering wheel bearing C. operation selector switch D. course selector pointer
Last Answer : Answer: B
Description : The ball bearings are provided with a cage (a) to reduce friction (b) to facilitate slipping of balls (c) to prevent the lubricant from flowing out (d) to maintain the balls at a fixed distance apart
Last Answer : (d) to maintain the balls at a fixed distance apart
Description : What is friction? Define coefficient of static friction and coefficient of kinetic friction.
Last Answer : What is friction? Define coefficient of static friction and coefficient of kinetic friction. Give the necessary formula for each.
Description : What is kinetic friction and static friction?
Last Answer : Friction is the resistance to movement of an object pressing/resting/moving on a surface. It's not intuitively obvious but the standing still friction and moving friction are different. Assume you have a ... than the force required to keep it moving (kinetic friction) after it has begun to move.
Description : In a journal bearings, the radius of the friction circle increases with the increase in- [IES-1997] (a) Load (b) Radius of the journal (c) Speed of the journal (d) Viscosity of the lubricant
Last Answer : (b) Radius of the journal
Description : The maximum frictional force which comes into play when a body just begins to slide over another surface is called (A) Limiting friction (B) Sliding friction (C) Rolling friction (D) Kinematic friction
Last Answer : (A) Limiting friction
Description : A block of wood initially at rest slides down an inclined plane. Neglecting friction, the kinetic energy of the block at the bottom of the plane is: w) all converted into heat x) equal to its ... kinetic energy at the top of the plane z) dependant on the materials of which the block is made
Last Answer : ANSWER: X -- EQUAL TO ITS POTENTIAL ENERGY (WITH RESPECT TO THE BOTTOM OF PLANE) WHEN IT WAS AT THE TOP OF THE PLANE.
Description : Ball bearings are used in cycles, scooters etc to -Physics
Last Answer : Reduce the friction between the wheel and the axle.
Description : The rolling contact bearings are known as (a) thick lubricated bearings (b) plastic bearings (c) thin lubricated bearings (d) antifriction bearings
Last Answer : (d) antifriction bearings
Description : . In gear boxes and small size motors, rolling contact bearings are used. a) True b) False
Last Answer : a) True
Description : In steam and gas turbines, rolling contact bearings are used. a) True b) False
Last Answer : b) False
Description : Ice skating is possible and practical because of a unique property of water. Is it because: w) The coefficient of kinetic friction of steel on frozen water decreases with decreasing temperature x ... sublimes y) The melting point decreases with increasing pressure z) Ice is a good thermal insulator
Last Answer : ANSWER: Y -- THE MELTING POINT DECREASES WITH INCREASING PRESSURE
Description : What would cause the force of kinetic friction to increase?
Last Answer : an increase in uk (apex)
Description : Pair of forces that cause steering wheel of a car to rotate is called A. couple B. friction C. normal force D. weight
Last Answer : couple
Description : In a water lifting electric pump, We convert – (1) Electrical energy into Potential energy (2) Kinetic energy into Electrical energy (3) Kinetic energy into Potential energy (4) Electrical energy into Kinetic energy
Last Answer : (1) Electrical energy into Potential energy Explanation: In a water lifting electric pump, we convert electrical energy into potential energy. In hydraulic pump mechanical energy in converted into potential energy
Description : In a water lifting electric pump, we convert (1) Electrical energy into Potential energy (2) Kinetic energy into Electrical energy (3) Kinetic energy into Potential energy (4) Electrical energy into Kinetic energy
Last Answer : Electrical energy into Potential energy
Description : What is Static Friction ?
Last Answer : The friction that occurs between two surfaces when one is not moving relative to the other is called positional friction.
Description : Kinetic friction is the (A) Tangent of angle between normal reaction and the resultant of normal reaction and the limiting friction (B) Ratio of limiting friction and normal reaction (C) The friction force ... body is just about to move (D) The friction force acting when the body is in motion
Last Answer : (D) The friction force acting when the body is in motion
Description : It is easier to roll a barrel than to pull it because (a) the full weight of the barrel comes into play when it is pulled (b) rolling friction is much less than sliding friction (c) the surface ... in contact with the road is more in the case of pulling (d) of a reason other than those mentioned
Last Answer : Ans:(b)
Description : What size socket do you need to change the wheel bearings on 1998 GMC Jimmy front and back axles?
Last Answer : Need to know if 2 wheel or 4 wheel drive for the front. Eitherway, there is no nut on the back axles.
Description : Where can I get new wheel bearings?
Last Answer : The best place to get any auto parts or wheel bearings is from your auto car dealer, or Canadian tire they should have you wanted. From what I gather no prices were posted online.
Description : Front and rear wheel axle bearings may be washed and replaced once in a) four years b) three years c) two years d) one year
Last Answer : d) one year
Description : Is rolling down a grassy hill kinetic or potiental?
Last Answer : Any time something falls, rolls, or slides down, gravitationalpotential energy is converted into kinetic energy.
Description : The reactive power drawn by a motor from an AC generator is the power which is _____________. A. used to establish the magnetic field of the motor B. lost in overcoming friction in the ... by current flow through the windings D. transmitted directly through the rotor shaft to perform useful work
Last Answer : Answer: A
Description : Babbitt metal used for making bearings should have (A) High co-efficient of friction between journal and bearing (B) Ability to retain lubricant on its surface (C) Low co-efficient of friction between journal and bearing (D) Both (B) & (C)
Last Answer : (A) High co-efficient of friction between journal and bearing
Description : The antifriction bearings (a) have low starting and low running friction at moderate speeds (b) have a high initial cost (c) can carry both radial and thrust loads (d) all the mentioned
Description : Assertion (A): In anti-friction bearings, the frictional resistance is very low as the shaft held by it remains in floating condition by the hydrodynamic pressure developed by the lubricant. [IES-2006] Reason (R): In hydrodynamic ... of A (c) A is true but R is false (d) A is false but R is true
Last Answer : (d) A is false but R is true
Description : Which of the following are functions of bearings? a) Ensure free rotation of shaft with minimum friction b) Holding shaft in a correct position c) Transmit the force of the shaft to the frame d) All of the listed
Last Answer : d) All of the listed
Description : What Are The Reasons Of Over Heating On Anti-friction Bearings?
Last Answer : The main reasons are, inadequate lubrication ,overloading ,miss-alignment and bearing in defective condition.
Description : Explain Briefly About Friction And Anti-friction Bearings?
Last Answer : Friction bearings. This type of bearings contact that shaft directly such as bush bearing ,journal bearing etc. These bearings generally made of cast iron ,brass and gun metal. Anti-friction bearings. These type of bearings have rolling elements such as balls, rollers etc.
Description : Instantaneous centre for a rolling wheel on a straight track will be at a.107 dynes b.A c.B d.C e.D
Last Answer : e. D
Description : A four wheel truck or whose operating weight is 12000 kg is pulled along a road having a rising slope of 2% at a uniform speed. Assume grade resistance factor = 10 kg/tonne. The tension in the tow cable is 720 kg. The ... will be (A) 20 kg/tonne (B) 30 kg/tonne (C) 40 kg/tonne (D) 50 kg/tonne
Last Answer : (C) 40 kg/tonne
Description : Only force acting on a bouncing ball is A. gravity B. weight of ball C. friction D. a and b both
Last Answer : a and b both
Description : When did the first ball bearings Skates came into life?
Last Answer : Ans. December 9th 1884.
Description : What is rolling friction? How does it arise?
Last Answer : What is rolling friction? How does it arise?
Description : Force ( including rolling resistance friction ) that acts upon the stabilising surfaces such landslide and sole of bottom are called a) Useful soil resistance b) Parasitic force d) Draft of implement. d) Pull of implement
Last Answer : b) Parasitic force
Description : Function of ball bearing in a wheel is –
Last Answer : to convert kinetic friction into rolling friction
Last Answer : o convert kinetic friction into rolling friction
Description : Which one of the following parts of a ball bearing acts as a barrier between the balls preventing them from bumping into each other? (a) Inner race (b) Outer race (c) Rolling element (d) Cage
Last Answer : (d) Cage
Description : Volute of a centrifugal pump should be designed in a fashion, such that the (A) Kinetic head gets converted into static head (B) Moving stream gradually reduces velocity (C) Mean velocity remains constant (D) None of these
Last Answer : (A) Kinetic head gets converted into static head