Term-End Examination December, calculator is permitted.
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1 No. of Printed Pages : 8 I BET-024 DIPLOMA IN CIVIL ENGINEERING (DCLE(G)) / DIPLOMA IN ELECTRICAL AND MECHANICAL ENGINEERING (DEME) / DCLEVI / DMEVI / DELVI / DECVI / DCSVI C.1 C.IE):: 1_ Term-End Examination December, 2015 BET-024 : E/M ENGINEERING Time : 2 hours Maximum Marks : 70 Note : All questions are compulsory. Use of scientific calculator is permitted. 1. Select the correct answer from the given four alternatives for the following multiple choice objective type questions : 14x1=14 (a) If the temprature remains constant, the volume of the given mass of a gas is inversely proportional to the pressure. This is known as Charles' Law Boyle's Law Joule's Law Gay-Lussac's Law BET P.T.O.
2 (b) In which of the following processes, will the internal energy of a system remain constant? Isothermal Adiabatic Isobaric Isochoric (c) A process in which the gas is heated or expanded in such a way that the product of its pressure and volume remains constant is called Isothermal process Isobaric process Adiabatic process Polytropic process (d) An adiabatic process occurs at constant temperature pressure heat None of the above BET-024 2
3 (e) The air standard is given by r (y--1) 1 r(y +1.) 1- r(y-1) efficiency of an Otto cycle 1 + r(y-1) where r = compression ratio, y = Cp/Cv. (0 The gas law ( PV = constant) is true for T Isothermal process Adiabatic process Both isothermal and adiabatic processes Neither isothermal nor adiabatic process (g) The actual power supplied by engine crank shaft is called Indicated power Brake power Frictional power None of the above BET P.T.O.
4 (h) An electric kettle rated at 220 V, 2.2 kw, works for 3 hours. The current drawn will be 2 amp 10 amp 25 amp 30 amp A wire of resistance R is cut into n equal parts. These parts are then connected in parallel. The equivalent resistance of the combination will be nr R/n n/r R/n2 (j) The resistance of an ideal voltmeter is Zero Infinity 100 SI 500 S2 (k) One ton of refrigeration is equal to 1000 kj 3.5 kw 1 kw 1000 kw BET-024 4
5 (1) The appropriate material to be used in the construction of resistance boxes, out of the following, is Copper Iron Manganin Aluminium (m) Three resistances each of 4 Q are connected to form a triangle. The resistance between any two terminals is 12 Q 6Q 8 Q 3 2 Q (n) In a pure inductive circuit with a.c. source, the current lags behind the emf by 2/E Tr./2 7r./4 2. Attempt any two of the following : 2x 7=14 (a) Explain briefly the simple vapour compression refrigeration system with the help of a neat diagram. BET P.T.O.
6 (b) (c) 0.1 m3 of air at a pressure of 1.5 kgf/cm 2 is expanded isothermally to 0.5 m 3. Calculate the final pressure of the gas and heat supplied during the process. Also calculate the work done during the expansion of gas. Explain with suitable sketches the working of a four-stroke Otto cycle engine. 3. Attempt any two of the following : 2x7=14 (a) Explain with a neat diagram the working of summer air-conditioning system. (b) A certain gas occupies a space of 0.3 m 3 at a pressure of 2 kgf/cm 2 and a temperature of 77 C. It is heated at a constant volume, until the pressure is 7 kgf/cm 2. Determine the temperature at the end of the process, mass of the gas, change in internal energy, and change in enthalpy. Assume C = kj/kg K, Cv = kj/kg K and R = 287 J/kg K (c) Discuss briefly the comparison between four-stroke and two-stroke engines. - BET-024 6
7 4. Answer any two of the following : 2x7=14 (a) A resistance A of 3 ohms in parallel with B, produces a current of 3 Amperes when connected across a 6 V battery. Find the current in A and B, the resistance of B. What resistance X must be put in series with AB combination to reduce the current to 2 Amperes? (b) State Faraday's law of electromagnetic induction. (c) Three capacitors of capacitance 10, 20 and 40 RF are placed in series across a 350 V source. Determine the Equivalent capacitance of the combination, Charge on each capacitor, Voltage drop across each capacitor, and Total stored energy. 5. Answer any two of the following : 2x7=14 (a) Deduce the expression for the emf induced by the operation of a D.C. generator. BET P.T.O.
8 (b) (c) What emf will be generated in an 8-pole wave wound D.C. generator, if it is rotated at 500 RPM? The flux per pole is 0.05 Weber and the number of armature conductors is 960. Find the inductance of an inductor which draws a current of 11 A when connected to 230 V, 50 Hz voltage. What current will it draw, if the supply voltage is changed to 150 V, 25 Hz? BET ,000
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