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Karnataka SSLC JTS : KSEEB Elements of Engg JTS I June 2009

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J X R z W : 7 ] [ Total No. of Qu estions : 7 ] J X z W : 3 [ Total No. of Printed Pages : 3 x z W : J.T.S. I Code No. : J.T.S. I : | ] I Subject : ELEMENTS OF ENGINEERING I : Date 13.06.2009 : 13.06.2009 : B 10.30 W R 1.00 ] [ : 50 Time : 10.30 A .M. to 1.00 P.M. ] Note : [ Max. Marks : 50 Answer questions from Sections A & B as per the instru ctions given under them. SECT ION A Instruc tion : Answer Qu estion No. I and any tw o fu ll questions of the remaining. I. Fill in the blanks with the appropriate word(s) selecting from the choices given in the brackets : a) 10 1 = 10 The output rating of a transformer is . ( kV , kW, kV A ) b) A good fu se wire mu st have melting point. ( l ow , m edium, high ) c) Normally the field poles of alternator is excited by . ( a.c. generator, d.c. generator, a.c. & d.c generators ) [ Turn over J.T .S. I d) 2 system is employed as a concealed wiring. ( P.V .C. c onduit, Casing & cappi ng, Cleat ) e) The motor u sed in table fan is . ( mul tipolar, uni versal , shaded pole ) f) Economiser is a boiler . ( acc essory, attachm ent, safety devic e ) g) Fuel pu mp is u sed in engines. ( petrol , diesel , gas ) h) Spur gears are u sed to transmit power from one shaft to another whose axes are . ( parallel , perpendic ular, inclined ) i) A centrifu gal pu mp develops pressure when compared to a reciprocating pu mp. ( l ess, sam e, m ore ) j) turbine is a reaction type tu rbine. ( Banki, Francis, Gi rard ) II. a) What is the function of boiler ? 2 b) What are the different methods of classification of boilers ? Give two examples in each of the different types. c) Draw a neat sketch of locomotive boiler and label its parts. 5 a) How are water turbines classified ? 2 b) III. 3 State the advantages of a centrifu gal pu mp over a reciprocating pu mp. c) IV. 3 Draw a neat diagram of bu cket pu mp and label its parts. 5 a) Classify internal combu stion engine. 2 b) Differentiate between petrol engine and diesel engine. 3 c) Describe with a neat sketch, the working of simple carburettor. 5 3 J.T .S. I SECT ION B Instruc tion : Answer any two fu ll qu estions of the following. V. a) Draw a neat diagram of d.c. generator and mention its parts. b) On what principle does a d.c. motor work ? Name the two types of d.c. compound motor. c) 5 3 A 220 volt, 5 h.p. motor having an armatu re resistance of 0 5 ohm and a fu ll-load armature cu rrent is 50 ampere. Find the back e.m .f. 2 VI. Draw a neat diagram of arc lamp and explain briefly. b) Explain the terms step-u p transformer and step-down transformer . 3 c) VII. a) List any four applications of three-phase indu ction motor. a) What sou rce is u sed for the generation of hydroelectric power ? Draw a neat layout diagram of hydroelectric power plant. b) 5 2 5 Name any two types of insu lators used in overhead lines for transmission and distribution of electric power. c) 1 Write short notes on any tw o of the following : 4 i) Appliances ii) Indoor wiring iii) Electrical measuring instru ments. [ Turn over

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Additional Info : Karnataka SSLC (Secondary School Leaving Certificate) Junior Technical School (JTS) - Karnataka Secondary Education Examination Board (KSEEB)
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