{"id":23193,"date":"2013-03-06T18:23:10","date_gmt":"2013-03-06T12:53:10","guid":{"rendered":"http:\/\/www.kopykitab.com\/blog\/?p=23193"},"modified":"2013-03-06T18:24:13","modified_gmt":"2013-03-06T12:54:13","slug":"delhi-university-question-papers-2010-electrical-technology","status":"publish","type":"post","link":"https:\/\/www.kopykitab.com\/blog\/delhi-university-question-papers-2010-electrical-technology\/","title":{"rendered":"Delhi University Question papers 2010 Electrical technology"},"content":{"rendered":"
\n

Delhi University Question papers 2010<\/h1>\n

B.Tech. Ist Year\u00a0<\/strong><\/h1>\n

\u00a0ELECTRICAL TECHNOLOGY (EME-106)<\/strong><\/h1>\n

Time : 3 hours\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Maximum Marks : 70<\/strong><\/h1>\n

Attempt any five questions. Symbols and notations have their usual meaning.<\/p>\n

Assume suitable missing data, if any<\/p>\n

1. (a) Explain the following:<\/p>\n

(i)\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/i>Permeability<\/p>\n

(ii)\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/i>Hysteresis<\/p>\n

(ii) Mutual Inductance.<\/p>\n

(b) A 4-pole, long shunt, lap wound generator supplies 25 kW\u00a0\u00a0at a terminal voltage of 500 V.<\/p>\n

The armature resistance is 0*03 \u00a32, series field resistance is 0*04 Q and shunt field resistance is 200 Q. The brush drop may be taken as 1 V. Determine the emf generated*\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 8<\/p>\n

    \n
  1. (a) Explain the following:<\/li>\n<\/ol>\n

    (i)\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Difference between moving coil and moving iron instruments.<\/p>\n

    (ii)\u00a0\u00a0\u00a0\u00a0 Methods for extending the range of voltmeter.<\/p>\n

    {Hi) Gravity control system is usually not used in electrical measuring instruments. 3×3=9<\/p>\n

    (b) Obtain Thevenin\u2019s equivalent circuit at A and B, as shown in Fig. 1.\u00a0 5<\/p>\n

    \"1\"<\/a><\/p>\n

      \n
    1. (a) Derive the emf equation of a dc generator. For designing high voltage dc generator which type of winding should be used and why?\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 7<\/li>\n<\/ol>\n

      (b) A dc shunt machine connected to 230 V supply ‘<\/p>\n

      has a resistance of armature as 0*115 \u00a32 and of\u00a0field winding as 115 Q. Find the ratio of the speed as a generator to the speed as a motor with the line current in each case being 100 A.<\/p>\n

        \n
      1. (a) Deduce the relationship between the phase and line quantities (voltages and currents) in three phase delta connected circuit.<\/li>\n<\/ol>\n

        Draw the phasor diagram to represent the above.<\/p>\n

        (b) In the circuit of Fig. 2 determine:<\/p>\n

        (i) The power supplied by the source<\/p>\n

        (\u00ab) The reactive power supplied by the source<\/p>\n

        (iii)\u00a0\u00a0\u00a0\u00a0 The reactive power of the capacitor<\/p>\n

        (iv)\u00a0\u00a0\u00a0\u00a0 The power factor of the circuit.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 8<\/p>\n

          \n
        1. (fl) Develop the equivalent circuit of a single phase transformer. Mention the physical significance of all its parameters.<\/li>\n<\/ol>\n

          (b) A 5 kVA single phase, 230\/400 V two winding transformer is connected as an autotransformer for 230\/630V. Find:<\/p>\n<\/div>\n

          \n

          (t) load current and current in each winding at the full permissible output<\/p>\n

          (\u00ab) efficiency at full load, if iron loss and full load copper loss are 30 W and 75 W res\u00adpectively.\u00a0\u00a0\u00a0\u00a0\u00a0 8<\/p>\n

            \n
          1. (a) Derive the expression for developed torque in a<\/li>\n<\/ol>\n

            three phase induction motor and find the condition for maximum torque.\u00a0\u00a0\u00a0\u00a0\u00a0 6<\/p>\n

            (b)\u00a0\u00a0\u00a0\u00a0 In a 6-pole, 3 phase, 50 Hz motor with star- connected rotor, the rotor resistance per phase is 0-3 Q, the leakage reactance at standstill is 1 *5 Q per phase, and an emf between the slip-rings on open circuit is 175 V.<\/p>\n

            Calculate:<\/p>\n

            (i) Slip at a speed of 950 rpm<\/p>\n

            (\u00ab) Rotor emf per phase<\/p>\n

            (Hi) Rotor frequency at a speed of 950 rpm<\/p>\n

            (iV) Rotor leakage reactance at a speed of 950 rpm.\u00a0\u00a0 8<\/p>\n

              \n
            1. (a) Derive emf equation of alternator and explain coil<\/li>\n<\/ol>\n

              span factor and distribution factor.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 7<\/p>\n

              (&) Explain the principle of operation of a synchronous motor and V-curve.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 7<\/p>\n<\/div>\n

                \n
              1. Write short notes on any two of the following:<\/li>\n<\/ol>\n

                (a)\u00a0\u00a0\u00a0\u00a0\u00a0 Diversity Factor and Demand Factor<\/p>\n

                (b)\u00a0\u00a0\u00a0\u00a0\u00a0 Megger<\/p>\n

                (c)\u00a0\u00a0\u00a0\u00a0\u00a0 Tariffs<\/p>\n

                (d)\u00a0\u00a0\u00a0\u00a0\u00a0 Armature Reaction.<\/b><\/p>\n","protected":false},"excerpt":{"rendered":"

                Delhi University Question papers 2010 B.Tech. Ist Year\u00a0 \u00a0ELECTRICAL TECHNOLOGY (EME-106) Time : 3 hours\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Maximum Marks : 70 Attempt any five questions. Symbols and notations have their usual meaning. Assume suitable missing data, if any 1. (a) Explain the following: (i)\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Permeability (ii)\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Hysteresis (ii) Mutual Inductance. (b) A 4-pole, long shunt, lap wound … Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"fifu_image_url":"","fifu_image_alt":""},"categories":[4773,120],"tags":[],"amp_enabled":true,"_links":{"self":[{"href":"https:\/\/www.kopykitab.com\/blog\/wp-json\/wp\/v2\/posts\/23193"}],"collection":[{"href":"https:\/\/www.kopykitab.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.kopykitab.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.kopykitab.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.kopykitab.com\/blog\/wp-json\/wp\/v2\/comments?post=23193"}],"version-history":[{"count":0,"href":"https:\/\/www.kopykitab.com\/blog\/wp-json\/wp\/v2\/posts\/23193\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.kopykitab.com\/blog\/wp-json\/wp\/v2\/media?parent=23193"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.kopykitab.com\/blog\/wp-json\/wp\/v2\/categories?post=23193"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.kopykitab.com\/blog\/wp-json\/wp\/v2\/tags?post=23193"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}