E���x]�7�`���҉��a�|����X���:�[�]��_p�耏S:3��8�ɬ�O�ʾ�B�llW ���tc��|�a��^x�U ��&J.$�w[�@ �@ �@ sݷpz�� �א>�������S�nCwV�c�'�!����c�!��� =���_�4n4Gq#�k�B�� 7��G��2�ח/�G��3����ge�,������ݫ�Iw%nb��Vl�{p��e��T� 7��&����-��dߤ�˰FW�*݋إ�,�u(8��c� �>��7ZTVw��Ë�:�$Io�~m0��6L0����׷��e���;P�9��r�^�����ki Thermal Conductivity Of Isopropyl Alcohol, Marshmallow Cereal Treats Microwave, Build Your Own Acoustic Guitar Kit, Ryobi Infrared Thermometer Ir002, Crema Catalana Lidl, Easy Homemade Gravy, Gerbera Meaning In Tamil, Assign Ip Address To Cisco Switch 2960, Solae Chill White Left Arm Modular Sofa, How To Read A Flute Finger Chart, Always Be Happy Together Meaning In Urdu, Beautiful Name Of Allah Pdf, Brick Chicken Thighs Recipe, List Of Private Hospitals In Kumasi, Foodland Korean Chicken, Mexican Food Consumption In The Us, Freshwater Fishing In Bc, Happy Inside Cereal Ingredients, Avoid Ruse Crossword Clue, Chicken Wings Air Fryer, Riteish Deshmukh House Name, " />
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mcq on protection and deprotection

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mcq on protection and deprotection

However, in the actual line, resistance and inductance are distributed over the entire length of the line but in case of the short line, they are lumped at one place. It comprises of all or some of the following components/parts. 1.In a circuit breaker, are is initiated by the process of Thermal protection switch protects against the overload. In case of a spring-operated mechanism, the spring is to be charged by an induction motor (motor-operated spring mechanism). 11 0 obj Multiple choice questions. A fuse is a safety device having a short length of a thin, tin-plated copper wire having the low melting point, which melts and breaks the circuit if the current exceeds a safe value. The energy gained is proportional to the product of the mean free path and the applied field strength E, and since the mean free path is inversely proportional to the pressure p it follows that the conditions are a function of E/p. The components do not get deteriorated. The assembly of the fixed and moving contacts along with other parts of the ‘current carrying circuit’ form a very important portion of any switchgear. This Act describes the basic rights that a consumer possesses. These can be classified as: Power frequency tests: Conducted on a clean new circuit breaker, the test voltage varies with a circuit breaker rated voltage. c) Transformers to isolate two systems When the coil energizes, the circuit-breaker contacts will open and disconnect power to the circuit. Ans: (a), a) Restriking voltage If the current flow through the heater becomes excessive the bimetal strip will warp and permit the spring to open the contacts. Opening Time:- The time interval which is passed in between the energization of the trip coil to the instant of contact separation is called the opening time. /Ascent 905 Ques.1. In the case of the short transmission line, the protection due to arc resistance is the major factor. The heating element is calibrated to produce a certain amount of heat when a predetermined amount of current flows through it. Some circuit breakers contain a small solenoid coil known as a shunt trip. H.R.C. Hence are safe for electrical equipment. The thermal relay is not suitable for operation on short-circuit as it will burns the elements sufficiently before the strip may deflect so as to close the contacts. /FontWeight 700 b) CUJT The shape of the fuse element depends upon the characteristic desired. The whole India except Jammu and Kashmir B. C) Particular Goods and Services. Inverse Definite Minimum Time (IDMT Relay):- In this Relay, the time of operation is approximately inversely proportional to the smaller value of current or other quantity causes operation intense to be definite time as the value increase without limit, Ques.38. d) Electrons A typical value may be about 3 percent of the rated voltage. X, In another type of surge absorber, the parallel combination of resistor and inductor is used as a surge absorber. An electric fuse works on the heating effect of current. ��34���l5:��w�����hR_��&�Y����k�Q�2�n�@ 9�[�Os���L~�]����eH*�$�b� Consumer Protection Act is significant to, How many rights does a consumer have under the Consumer Protection Act, Under the Consumer Protection Act, the rights of a consumer do not include to be, When the seller manipulates the price, it is known as, Under this act, the minimum age of forum member of a district forum should be, The maximum age for a state commission member should be, The maximum age national commission member should be, Which of the following forum can reappoint the same person as to its member, In which forum it is compulsory to have a female member. Shunt trips are used to open the circuit breaker contacts by energizing the solenoid from an external source. It requires replacement after each operation. /Leading 33 However, if current increases beyond the rated value, the heater increases in temperature and thus the bi-metal strip is raised in temperature, trips the latch and break the circuit. A fuse wire is connected in series in the electric circuits. What this means is simply that as the arc cools, the cooling efficiency increases the deionization of the arc space, which in turn increases the arc resistance. With which of the following, a circuit breaker must be equipped for remote operation? /Filter /FlateDecode The materials whose electrical conductivity is usually less than 1 × 106 mho/m are B) 6. A relay used on short transmission lines is, Note:- In the case of short lines, power surges remain for a shorter period and hence, their effect is unimportant. As the element melts, it vaporizes and disperses. Which of the following statement is true? << Stay tuned to BYJU’S for more MCQs, accounts sample paper, question papers, syllabus and Commerce notifications. The main contacts carry the normal current without giving a high millivolt drop, and the contacts must be made with enough pressure because there could be an opening tendency even when the rated current is canned by the breaker, particularly for breakers with higher current ratings. Foundation: Introduction to the pharmaceutical industry « Previous Next » How long is a typical route to launch for a pharmaceutical product? In order to maintain the ionization of the gas, when the arc is effectively cooled, the magnitude of the arc voltage must increase. Their mating surfaces are slightly ‘roughened’ to ensure better ‘contact’, i.e., ‘lower contact resistance’. shows the typical shapes and the relative ‘positioning’ of main and arcing contacts. A. d) Circuits to break the system The procedure for this test is as follows: Ques.39. Impulse tests: in this test impulse voltage of specified shape and magnitude is applied to the breaker. Thermal overload relay or switches can be divided into two types:-, Melting overload Relay or Solder Melting Pot. all or some of the following components/parts. Ans: (a), a) Air break circuit breaker Ans: (c), a) Bulk oil circuit breaker Your email address will not be published. The main contacts are made of copper-cadmium alloys. /Supplement 0 d) SF6 circuit breaker Thus to reduce the steepness of wavefront of the surge, surge absorber is used. 9 0 obj A) 8. ?�'H�[V�?���_:�Y(�88�5�{W�=� ]������zׯ�뢟 � �놵��|>��T>��q\��H�*���hy�ɝ������ypf��ߺ�QH������/ܮ%���[�Ɓ��8��J��^����gln�i{g��\g�u����O�d�U@��۶�}1��@m��qH�]�m��-/���2 }����������h�l���/~l�n���@��?���s�]r9䫨=�|ֹ�7�|V�C�O���Cgo�x0����������nߨ��G�x|��7���쭯_y���v���={2�_R{�c���:��]|/������1�p�u/O=͹� S� �[�[V�쏿��?�z��t�t�5������:.���[���)I���ָ��N�P���P��ɯ��+S���L�=L���i�)�����^�u2C7���>\�A�5�m�ߡ���?����I���R")�L�IV���R��&�K��.�*�a9��R��Uv0����.em���^�n�����,[6,�&Z���xm��f�s���.ܐ.�gu��z�_C�xݓ�I�u0N��t��Mۓȿw��>E���x]�7�`���҉��a�|����X���:�[�]��_p�耏S:3��8�ɬ�O�ʾ�B�llW ���tc��|�a��^x�U ��&J.$�w[�@ �@ �@ sݷpz�� �א>�������S�nCwV�c�'�!����c�!��� =���_�4n4Gq#�k�B�� 7��G��2�ח/�G��3����ge�,������ݫ�Iw%nb��Vl�{p��e��T� 7��&����-��dߤ�˰FW�*݋إ�,�u(8��c� �>��7ZTVw��Ë�:�$Io�~m0��6L0����׷��e���;P�9��r�^�����ki

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