Answer: a. Therefore, electric braking of dc motors has its own importance, keeping it in mind, in this article I am discussing electric braking of dc motors. MCQ in Machine Design and Shop Practice Part 3 | ME Board Exam. PART 1: MCQ from Number 1 - 50 Answer key: PART 1. A block-brake shown below has a face width of 300 mm and a mean coefficient of friction of 0.25. 2 MOTORS COMMONLY USED IN EV's Different types of motor exhibit different characteristics, which makes it important to evaluate motors on some basic parameters for choosing a particular type of motor for an electric vehicle. An automobile brake is only used to reduce the speed or bring the vehicle to hault. Tonnes Show Explanation Ques 33. Compare the calorific value of commonly used fuel to examine fuel efficiency Define ignition temperature to explain why minimum temperature is required for a substance to catch fire. nanofibers that repair the surface of brake pads. Shock is a state where there is inadequate circulating blood volume and inadequate tissue perfusion of the vital organs. The shoes are pulled away from the drum by the springs when the brakes are released. After . Electric motors used in electric vehicle should have important attributes like simple design, high a) shoe brake. Learn Automobile Engineering MCQ questions & answers are available for a Mechanical Engineering students to clear GATE exams, various technical interview, competitive examination, and another entrance exam. Electromagnetic brakes operate electrically but transmit torque mechanically. Top 10 Tools Or Softwares For Embedded Engineers, Electronics Tools Why ECU Is Used In Cars, Working Of Electronic Control Unit, Benefits Electric Vehicle Quiz 172 Created on July 29, 2021 Electric Vehicle These quiz questions as most commonly asked in online tests. The test is based on the information found in Section 14 of the Texas CDL Handbook.The Special Requirements Test consists of 20 multiple-choice questions, and you'll need to correctly answer at least 16 questions (80%) to pass. An ELECTRIC DRIVE is defined as an electromechanical device . Explains processes and phenomena in order to relate to science behind the phenomena/processes . reducing the amount of friction necessary to slow a car. UPSC is India's premier central recruiting agency for central Government public servants. The clearance between the valve and rocker arm is measured by using: (A) inside micrometer (B) feeler gauge (C) wire gauge (D) outside micrometer. Test Set - 3 - Electrical Machines - The test carries 40 questions on topics such as Series, Compound - D.C Motor, Speed Control of D.C Motor, Permanent Magnet & Brushless, Starters used in D.C Motor, Rotating Magnetic Field in 3 phase induction motor etc. PHEVs have larger battery packs than HEVs, making it possible to drive using only electric power (about 10 to 40 miles in current models). Hydraulic braking system. 5. Electric brakes are not used in automobiles as service brakes. The delay may be longer if the motor is huge in size and if it is running at high speed. ⇒ Click Here For More Automobile MCQ. Second, DC machines with a mechanical commutator today are rarely used. PART 4: MCQ from Number 151 - 200 Answer key . and 7 000 lbs. When the load is removed from the DC motor or when the supply is disconnected, the motor should come to rest. Piezoelectric ceramics are smart materials commonly used in mechatronic devices and smart systems. 1-5 They can be used to sense changes in pressure and strain in the environment and can generate electrical responses. Electric brakes are not used in automobiles as service brakes. Usually batteries are used in the ups system; Which of the following vehicles produces zero emissions mcq _____ is one of the most common reasons vehicles flip over. c) band and block brake. 2) What is the expansion of NVH, an abbreviation commonly used in automobile dealings? Answer: (b) high starting torque. Electric dynamometers (DC or AC) are required to run test cycles that include motoring segments, where the dynamometer is driving the engine, such as the US FTP transient cycle or the World Harmonized Transient Cycle (WHTC). Which of the clutch arrangement is used in synchromesh gearbox? We have created this list based on previous years' papers. During your e-learning supplied by MOT Online Learning, recommendations and suggestions are made but the definitive source of information about what constitutes a Pass, Advisory, Minor, Major or Dangerous should always be the MOT Tester Manual and associated Special Notices. C) Which of the following is (are) an electrical brake? (d) nearly constant speed. WORKING OF DRUM BRAKES Drum brakes work on the same principle as the disc brakes. The things Carried out by means of electronic data interchange, and other means of electronic communication is commonly referred to as. (See Fig.10.5(b)). Reduces the stopping distance B. Minimizes the brake fade C. Maintains directional control during braking by preventing the wheels from locking D. Prevents nose dives during braking and thereby postpones locking of the wheels Answer & Solution Discuss in Board Save for Later 2. 1. <a title="Clutch MCQ" class . The brake commonly used in motor cars is View Answer Explanation Category: Mechanical Engineering MCQs Sub Category: Machine Dynamics Mcqs 128 Q: When brakes are applied to all the four wheels of a moving car, the distance travelled by the car before it is brought to rest, will be Q: Which of the following is an absorption type dynamometer ? Multiple Choice Questions: 1. wet . Q. cooling fan. The power source which carries the pedal force applied by the driver on brake pedal to the final brake drum or brake disc in order to de accelerate or stop the vehicle the braking systems are of 6 types-. In electrical brakes an electromagnet is used to actuate a cam to expand the brake shoes. Disadvantages, Limitations of Electrical Braking: Electric braking can not be used for hold the machine after coming to the rest. (b) high starting torque. When flow of current is stopped the cam and brake shoes return to their original position and brakes are disengaged. These short objective type questions with answers are very important for Board exams as well as competitive exams. In turn, this will reduce the braking distance by a few meters. Vacuum braking system. 05․. Drum brake also has an adjuster mechanism, an emergency brake mechanism and lots of springs. This is why they used to be referred to as Electro Mechanical clutches and brakes. d. 2. Vacuum braking system. The problem was that batteries used to be incredibly heavy. These short solved questions or quizzes are provided by Gkseries. Air or pneumatic braking system. If the flux per pole is 0.022 Wb, then the generated emf is Electric actuators are a combination of a servo motor with worm gear to prevent reversal of drive direction by an unbalanced load. Bombay. Below are the most common actuators according to energy source: Hydraulic Actuators. The characteristics of the drive for crane hoisting and lowering is Smooth Movement Precise control Fast speed control All of the above Show Explanation Ques 32. An application of power to the induction motor also energizes the solenoid, which releases the brake and allows the pulley to rotate. First, the operating principle of the electric machine assumes periodic commutation of the current of the winding; because of this, the current of the winding is actually AC current. Ans. For DC/AC Circuits courses requiring a comprehensive, classroom tested text with an emphasis on troubleshooting and the . 120. Variable resisters are commonly used for AC and DC drives and also needed for dynamic braking of drives Semiconductors switch in parallel with a fixed resistance is used where stepless variation is needed. These electrical signals can be input to feedback systems to stimulate movements in actuators, to trigger alarms or to switch . 1.2 FACTORS INFLUENCING THE CHOICE OF ELECTRICAL DRIVES 53 environment such as global warming and acid rains current; formation of multiple images; structure of flame, etc. Types of Brakes: DISC BRAKE. Answers are available at the bottom of the article. Ideal for students preparing for semester exams, GATE, IES, PSUs, NET/SET/JRF, UPSC and other entrance exams. 1918 Malcolm Lougheed developed a hydraulic brake system. 118. In case of locomotives the tractive power is provided by (a) single cylinder double acting steam engine (b) double cylinder, single acting steam engine (c) double cylinder, double acting steam engine (d) single stage steam turbine Ans: c 15. EE 8015 Electric Energy Generation Utilization and Conservation- Page 1 Department of Electrical and Electronics Engineering EE 8015 -Electric Energy Generation Utilization and Conservation Unit IV - MCQ Bank 1. Three series-parallel combinations possible, and weak field operation. electric motor, which uses energy stored in a battery. The electromagnet is energized by the current flowing from the battery. Answer: Noise, Vibration and Harshness. The steady state and dynamic characteristics of electric drives can be shaped to satisfy the load requirements. So a mechanical braking is required additionally. A train has a mass of 500 tonne. The brake commonly used in motor cars is Q: When brakes are applied to all the four wheels of a moving car, the distance travelled by the car before it is brought to rest, will be Q: Which of the following is an absorption type dynamometer ? This article lists 100 DC Motor MCQs for engineering students. The total distance of 9.5 miles and that was flagged off by the Governor of Bombay "Sir Leslie Orme Wilson". Mechanical braking system. A) run with excessive vibrations. Hydraulic braking system. The disc brake is a mechanism for slowing or stopping the rotation of a wheel from its motion. Al-Ko Dexter Lippert and Quality Trailer Axles Geniune TruRyde Brakes TruRyde parts are manufactured to automotive standard in ISO/TS-16949 registered factory. Air or pneumatic braking system. What is EBS? In electric braking negligible amount of heat is generated whereas in mechanical braking enormous heat is produced at brake shoes which leads to failure of brakes. Automobile Quiz Questions Answers Part 1. 9. electric-brake.com - Electromagnetic Brakes - How they work Principles of Electric Circuits: Pearson New International Edition [9th edition] 1292025662, 9781292025667. MCQs 8: A 4 pole, lap wound d.c. generators has 40 coils with 8 turns per coils. 3) What was the rally with which the World Rally Championship opened? The damper fluid leakage typically occur from a) Upper damper mounting b) Bottom of damper 1. The brake commonly used on train boggies is band brake band and block brake shoe brake internal expanding Answer 3. The function of anti-lock brake system (ABS) is that is A. Electrical Drive MCQ. 48. The electromagnet is energized by the current flowing from the battery. The capacity of a crane is expressed in terms of Span Type of drives Tonnes None of the above Answer 3. Hydraulic actuators operate by the use of a fluid-filled cylinder with a piston suspended at the center. A disc brake is normally made of cast iron, but in some cases, it is also made of composites such as carbon-carbon or ceramic -matrix composites. Connecting rheostat in series C. Applying variable voltage by means of silicon controlled rectifier D. Applying variable voltage by means of variable auto-transformer E. All of the above methods View Answer Your Comments 10. 30 seconds . Take out the function which is not a requirement of clutch. generator. 4.2 Electric Drive with DC Machines For some reasons, today the term DC drive is not clear. The parking brakes employed in vehicles are operated; Which of the following statements are true for electric field lines? The traveling speed of the crane varies from Electric engines that use much more gentle and efficient magnetic fields. A gear used in the tractor hydraulic system normally is; In forced circulation system, a thermostat valve is placed at; In force-feed cooling system thermostat valve begins to open at; In tractor engines, a commonly used thermostat valve is; Thermostat valve is used in; A pump used in the tractor hydraulic is; The pump used in most of the . The power source which carries the pedal force applied by the driver on brake pedal to the final brake drum or brake disc in order to de accelerate or stop the vehicle the braking systems are of 6 types-. PART 3: MCQ from Number 101 - 150 Answer key: PART 3. The same general types of brakes, including water, eddy current, and electric brake, can be used in engine dynamometers. and the specialty and properties of these motors are different from each other, hence this braking methods also differs from each other.But we can divide braking in to three parts mainly, which are . The brakes commonly used in railways trains is shoe brake band brake band and block brake internal expanding brake Important and Frequently Asked in Competitive Exams . [11/99] Four of these are still in use on the Mumbai-Igatpuri route; for the Pune-Karjat shuttle. This is the driving force that will open the doors to great changes for braking systems and that makes one say that the "brake of the future" is about to see the light. They are available in wide range of torque, speed, and power. In Texas, all CDL applicants must pass the Special Requirements Test before they are permitted to take any other CDL test. We know that there are various types of motors available (DC motors, induction motors, synchronous motors, single phase motors etc.) Multiple Choice Questions on Shock. Since 2001 the investment in R&D activities for the electric braking systems or brake-by-wire, as the insiders define it, have been growing. Question 1 ___________ is an energy recovery mechanism that slows down a moving vehicle or object by converting its kinetic energy into a form that can be either used immediately or stored until needed. Q: The transmission type of dynamometer is a Q: The material used for the brake lining should have Q: However, single-phase AC or DC motors have also been used, but infrequently. Overload capacity of diesel engines is usually restricted to (a) 2 percent (b) 10 percent (c) 20 percent Brakes are used to reduce or cease the speed of motors. 6 000 lbs. Travelling cranes commonly use this form of solenoid braking on all directional movements. fuel pump. A strong breaking torque is achieved by maintaining the supply voltage to the armature reversed. In Figure 1, the brake shoes are held in the 'on' position against a flat pulley by a substantial spring. These short solved questions or quizzes are provided by Gkseries. All the DC Motor Questions & Answers given below includes solution and link wherever possible to the relevant topic. Answer. inductors employed to limit starting current of ac motors. Electric Braking of DC Motors The DC motor is still being widely used due to its excellent braking characteristics and ability of smooth transition from the motor to generator mode and vice versa. 250+ TOP MCQs on Brakes and Dynamometers and Answers. The Learning Point This is the Multiple Choice Questions Part 3 of the Series in Machine Design and Shop Practice - MDSP as one of the Mechanical Engineering topic. Electrical motors are electrical energy conversion devices that are used mostly in all electrical systems. reclaiming heat from the brakes and using . (A) Magnetic particle brake (B) Hysteresis brake (C) Eddy current brake (D) All of the above 8. 1. Automobile Engineering MCQ question is the important chapter for a Mechanical Engineering and GATE students. B) run at 2/3 of synchronous speed. Centrifugal clutch Single plate clutch Dog clutch Fluid clutch 22. Generally, three-phase AC motors that deliver higher torque (ranging up to >80,000 NM) are deployed. DC series motors are very suitable for heavy duty applications such as electric railways, rolling mills because of. Hypovolemic shock is the most common type. Magnetic field - Wikipedia But there will be a delay before it stops. b) band brake. 4. Thus left the side of the servo cylinder piston is exposed to atmosphere and vacuum acts on the right side, which causes the braking effort.. Braking takes place by suction from the engine inlet manifold. Multiple Choice Questions (MCQ) with Answers on Suspension system. 119. The brakes commonly used in railway trains is. _____ is one of the most common reasons vehicles flip over. This was designed as an alternative to the conventional braking system of applying friction over the wheels to slow them. Q: Most commonly used electrical motor for speed control applications are the following: DC Machines . Q. Regenerative braking involves : answer choices . Q. There are three methods of electric braking of dc motors: Plugging Dynamic or Rheostatic braking and, Regenerative braking Plugging This method involves the sudden reversal of the connections of either the field or the armature winding of the motor. 1) Mercedes cars belong to which country? This is linked to the wheel and/or the axle. 21. 1-Leaf springs absorb shocks by (A) bending (B) twisting (C) compression (D) tension (Ans: A) 2-Coil springs absorb shocks by (A) bending (B) twisting (C) compression (D) tension (Ans: C) 3-The following is a type of leaf springs In this also when the brake pedal is pressed, air to atmosphere enters the compressor . Calculate the torque capacity of the brake. Gradual engagement Maximum Inertia Smallest possible size Good heat dissipation 23. EBS (electronic braking system) and its components basically reduce the buildup times and response in brake cylinders. (D) Rotor and electric. Due to energy capacity and weight, mostly the lithium cells are chosen today's EV industry. Comes with mounting bolts nuts and lock washers Works with 5 200 lbs. Generally which brakes are on the front wheels Generally which brakes are on the front wheels The brakes commonly used in railway trains is The brakes commonly used in railway trains is Skids occur when the brakes are applied so hard that the front or rear wheels lose traction The function of master cylinder in hydraulic brakes is to Air brakes for loco, vacuum brakes for train. These short objective type questions with answers are very important for Board exams as well as competitive exams. This reaction was caused by an allergen exposure. Thus left the side of the servo cylinder piston is exposed to atmosphere and vacuum acts on the right side, which causes the braking effort.. Braking takes place by suction from the engine inlet manifold. Answer: Germany. Energy Use in Conventional Vehicles Introduction. Damper is also known as a) Shock absorber b) Torsion bar c) Spring d) Radius rod Q3. 3. The below list provides all the multiple-choice questions related to the synchronous motors. 41. Commonly, hydraulic actuators produce linear movements, and a spring is attached to one end as a part of the return motion. In this also when the brake pedal is pressed, air to atmosphere enters the compressor . Electric traction was introduced on Indian Railways in the year 1925 on 1.5 KV DC and the first electric train ran between Bombays Victoria Terminus and Kurla along the Harbour Line on February 3rd 1925. (c) possibility of speed control. Tags: Question 7 . Shoes press against a rotating surface. A. Countercurrent Braking B. Electric brakes are commonly used on (a) two wheelers (b) cars (c) trucks (d) trailers. load, eddy current brakes have speed-torque characteristics given by T L = kω. 42. There are many types of electromagnetic brakes (tooth, multiple disc, hysteresis, magnetic particle). Dynamic braking C. Regenerative braking D. None of the above View Answer Question 2 Air Brake: This type of air brake system is commonly used in heavy vehicles such as buses, trucks, etc.. Brakes Multiple Choice Questions and Answers for competitive exams. This is commonly referred to as the all-electric range of the vehicle. 2. The principal object of a brake is to balance the energy give energy absorb energy none of the above Answer 2. Angioedema of the face such that the boy cannot open his eyes. Electric braking is a method of bringing the rotating motor to rest. Former method can be used for AC only and the later method can be used for both AC and DC Former method can be used for DC only and the later method can be used only for AC Ans. The device used to reduce the exhaust noise is known as: (A) exhaust manifold (B) muffler (C) tail pipe (D) exhaust pipe. Mechanical braking system. PHEV batteries can be charged several ways: by an outside electric power source, PART 2: MCQ from Number 51 - 100 Answer key: PART 2. Brake capacity depends upon (A) The unit pressure between braking surfaces (B) The contacting area of braking surface (C) The coefficient of friction (D) All of the above 9. 1. The authentication to be affected by use of asymmetric crypto system and hash function is known as . d) internal expanding brake. READ MORE MCQ OF: ♦ In di an Hi st ory. In case one phase of a three-phase synchronous motor has short-circuited the motor will. Manufacturers: English Electric / Vulcan Foundry The electric motor is used to improve the energy efficiency (improves fuel consumption) and vehicular emissions while the ICE provides extended range capability. SURVEY . a. e-communication b. e- governance c. e- record d. e-commerce. Electric engines are superior in almost every way: They are lighter, smaller, cheaper, require no maintenance, are four times more efficient, cause no exhaust, and can run on renewable electricity. Damper in an automobile is used to a) Absorb the energy b) Dissipate the energy c) Release the energy d) Increase the energy Q2. Following is the list of multiple choice questions in this brand new series: MCQ in Industrial Electronics Principles and Applications. 1. Mostly used for passenger duties despite the M=mixed classification. In Preparation for the ME Board Exam make sure to expose yourself and familiarize in each and every questions compiled here taken from . When flow of current is stopped the cam and brake shoes return to their original position and brakes are disengaged. DC Motor Braking MCQ Question 1 Detailed Solution Download Solution PDF Plugging: In this method, the motor is reconnected to the supply in such a way that it has to develop torque in opposite direction to the movement of the rotor, it can be done by reversing the connections of the armature (a) low initial as well as maintenance cost. Machine Dynamics Multiple Choice Questions on "Brakes and Dynamometers". Diameter of the disk is 1m and time taken to come to stop the disk by brake is 1.6sec.Square of radius of gyration is 0.2.
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