F r = c W (1). Rolling Friction - Definition, Examples, Coefficient ... MCQ Questions for Class 8 Science with Answers were prepared based on the latest exam pattern. The point where movement occurred which triggered the earthquake is the _______ . MCQ on Transportation Engineering-I. An active volcano Mauna Loa is located in: a. Hawaii, USA b. Brazil c. Japan d. None of the above 2. Series resistance b. A ball rolling along the ground, gradually slows and finally stops due to _____force. c = rolling resistance coefficient - dimensionless (coefficient of rolling friction - CRF) C. resistivity of the material on ohm-meters. Test: Rolling Resistance | 15 Questions MCQ Test It is difficult to walk on any oily floor because. Rolling friction is the resistive force offered by any surface which opposes the rolling motion of any object that rolls over it, thus causing it to slow down and eventually stop. Correct Answer View All Answers. If the weight of the wheel is 18 000 N and the diameter of the wheel is 300 mm, determine the coefficient of rolling resistance. c) The couple moment produce by the single force acting on the body. Rolling resistance, sometimes called rolling friction or rolling drag, is the force resisting the motion when a body (such as a ball, tire, or wheel) rolls on a surface. a) The tendency of rotation of the body along any axis. Question No : 268 The coefficient of rolling resistance for a truck weighing 63,500 N is 0.018. We have provided Friction Class 8 Science MCQs Questions with Answers to help students understand the concept very well. Electrical MCQ (Multiple Choice Questions) - JavaTpoint 2. Which of the following describes the build up and release of stress during an earthquake? of resistance, which are the major components of friction: (1) Rolling resistance (friction) of rollers with outer or inner ring raceways — elastic hysteresis and viscous rolling resistance of EHL (2) Sliding friction between inner ring ribs and roller ends When an axial load F a is applied on tapered roller bearings, the loads shown in Fig . PDF SCIENCE MCQ Class8 Which of the following diseases appeared as public health concern in the last quarter of 20 th View Answer. Engineering Mechanics Multiple Choice Questions on "Rolling Resistance". The moment of resistance of an under - reinforced section is computed on the basis of . B. F RR is the rolling resistance force. Forming operation which does not involve rotation of work piece is a) Spinning b) Thread rolling c) Ring rolling d) Upsetting. Rolling resistance is the resistance to rolling that occurs when a round object, such as a ball, wheel, or cylinder rolls on a surface. A. 8. All the contents are prepared from latest NCERT Textbooks issued for session 2021-22. C) Wind or air resistance. Causes of tire rolling resistance, and our protocols when ... Electrical Objective Questions with Answers GK - Set 01 ... c) Smoother ride at low speeds. The total opposing force is known as Impedance. Class 8 Science Chapter 12 MCQ (Multiple Choice Questions) of Friction updated for academic session 2021-2022 CBSE and state board students free to use. INTRODUCTION TO PHYSICS OF CONTACT RESISTANCE Summary • Presented concepts have been adopted from the field of micro-contactor design developed in 1950's • Quality of contact resistance relies on contactor's ability to penetrate the insulating surface films and form metal-to-metal contact spots that carry the majority of flowing current Friction multiple choice questions and answers | MCQ ... b) The moment of inertia of the body about any axis. 250+ TOP MCQs on Rolling Resistance and Answers. C. equal to latest event time of preceding node. Causes a steadily applied pressure instead of impact force. On this tyre a force (P), is acting at its centre. One of the variables of the rolling resistance force equation is called the Coefficient of Rolling Resistance (Crr). D) All of the mentioned. Rolling: It results due to rolling resistance between the wheel tread and head of the rail. Parameter q sy 3 controls the slight slope of the resistance with speed. D. Behavior of rolling resistance is different to friction resistance. If the gross vehicle weight of a truck is 30 tonne Multiple Choice Questions for Earthquakes - Chapter 16 Rolling resistance is caused by: A. The gears in a car's ... Solving the Friction Multiple Choice Questions of Class 8 Science Chapter 12 MCQ can be of extreme help as you will be aware of all the concepts. Behavior of rolling resistance is different to friction resistance. The amount of ground displacement in a earthquake is called the _________ . ; The arc and the weld zone are completely covered under a blanket of granular, fusible flux which melts and provides protection to the weld pool from the atmospheric gases. 3. B. product of the length of the conductor in meters. Q7. 1.50; 2 . 490. View Answer. The secondary causes of rolling resistance are air circulation inside the tyre, fan effect of the rotating tyre by the air on the outside and the friction between the tyre and road caused by tread slippage. The pull required to overcome the rolling resistance of a wheel is 90 N acting at the c enter of the wheels. F r = rolling resistance or rolling friction (N, lb f). D. 19 days. In A.C. and an additional opposing force acts in addition to resistance. I hope that the article-"Multiple-Choice Questions on Welding" will be helpful to you. 2. A. Rolling resistance is often neglected when solving problems involving rolling. 0.75 mm. Check the below NCERT MCQ Questions for Class 8 Science Chapter 12 Friction with Answers Pdf free download. D. resistance of the conductor ohms per meter. select the correct statements? University of Mumbai. The force that resists the motion of a body rolling on a surface is called the rolling resistance or the rolling friction.. If the weight of the wheel is 18 000 N and the diameter of the wheel is 300 mm, determine the coefficient of rolling resistance. It is caused primarily by deformation of the object, deformation of the surface, or both. Rolling Resistance. The key, which consists of two square keys, is called, Ans. Is used to force the end of a heated bar into a desired shape. B. . The tractor weighs 12.5 tonnes and is operating along a 2 percent upgrade and the rolling resistance is 45 kg/tonne. The aspect ratio ( expressed in percentage) of the tyre is defined as the ratio of. Tyres are treaded to. Show/hide. It is mainly caused by non-elastic effects; that is, not all the energy needed for deformation (or movement) of the wheel, roadbed, etc., is recovered when the pressure is removed. Choose the correct option. Download Solution PDF. B. For temperatures t equal to and above 0 Deg C, the equation is R (t) = R0* (1+A*t+B*t²) For temperatures t below 0 Deg C, the equation is R (t) = R0* (1+A*t+B*t²+C* (t-100°C)*t³) Where A, B, & C are constants for specific RTD . Question 1. The normal time required for the completion of project in the above problem is. 1. b. a. A. d. 0.45 mm 1. 4000 plus a variable cost of Rs. 4) In a two-wattmeter method, the measured power was 40kW At 0.8 lagging power factor. Below is an explanation of the what and why . 9 days. In this section of Electronic Devices and Circuits.It contain Transistors MCQs (Multiple Choice Questions Answers).All the MCQs (Multiple Choice Question Answers) requires in depth reading of Electronic Devices and Circuits Subject as the hardness level of MCQs have been kept to advance level.These Sets of Questions are very helpful in Preparing for various Competitive Exams and University . Forces of the body than or equal to latest event time of preceding node as the ratio of aerodynamic.... 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