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IETE DIPIETE (old scheme) Electrical Engineering Exam paper |

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Re: IETE DIPIETE (old scheme) Electrical Engineering Exam paper
Here I am giving you question paper for IETE DIPIETE (old scheme) Electrical Engineering Examination in PDF file attached with it so you can get it easily.. Q.1 Choose the correct or best alternative in the following: (2x10) a. If V represent voltage, R represent resistance, I represent current, W represent power then which of the following relation is incorrect (A) I = (B) V = (C) W = V2/R (D) None of the above b. Ohms law is not applicable to (A) Electronic resistors (B) High voltage (C) High current densities (D) Vacuum diode c. An induction motor is (A) Self starting with zero torque. (B) Self starting with very high torque. (C) Self starting with smaller torque. (D) None of the above. d. In an a.c circuit the ratio kW/kVA is known as (A) Form factor. (B) Peak factor. (C) Power factor. (D) Load factor. e. Which motor would you be select as a drive for an electric clock? (A) D.C series motor. (B) Universal motor. (C) Synchronous motor. (D) Squirrel cage induction motor. f. For three phase star connected circuit (A) Line voltage = phase voltage. (B) Line current = phase current. (C) Line current = phase current. (D) None of the above. g. Iron losses in a DC machine take place in (A) Yoke. (B) Commutator. (C) Main body. (D) Armature. h. The efficiency of a Transformer is maximum when (A) it runs at half of full Load. (B) it runs at full Load. (C) its Copper Loss equal to Iron Loss. (D) it runs at overload. i. A three phase 440 V, 50 Hz induction motor has a speed of 950 rpm, if the machine has 6 poles, the % slip would be (A) 10% (B) 5% (C) 1% (D) 0.5% j. Starting torque of a single phase induction motor is (A) Uniform (B) High (C) Low (D) Zero Answer any FIVE Questions out of EIGHT Questions. Each question carries 16 marks. Q.2 a. State and explain Kirchoff’s Current Law and Kirchoff’s Voltage Law with example. (8) b. Determine the current flowing in each branch of the circuit shown in Fig.1 (8) Q.3 a. Define the following A.C quantities (i) R.M.S value of alternating current. (ii) Instantaneous value of alternating current. (iii) Average value or mean value of alternating current. (iv) Amplitude. (8) b. The equation of an alternating current is i = 42.42 sin 628t. Calculate (i) its maximum value (ii) its frequency (iii) its R.M.S value (iv) its average value (8) Q.4 a. What are the different methods of speed control of D.C motors. Explain in brief. (8) b. A 6-pole, wave wound shunt generator has 1200 conductors. The useful flux per pole is 0.02wb, the armature resistance 0.4 ohm and the speed 400rpm. If the shunt resistance is 220ohm, calculate the maximum current which the generator can deliver to an external load if the terminal voltage is not to fall below 440V. (8) Q.5 a. What are the different losses in a transformer. How these losses varies with the load? (6) b. A 50 kVA single phase transformer has on full load a copper loss of 560W and iron loss of 500W.Calculate the efficiency at 50% of full load for a power factor of unity. (10) Q.6 a. Explain the principle of operation of 3-phase Induction motor? (8) b. A 3-phase, 50Hz induction motor has 8 poles. It runs at a speed of 700rpm. Determine (i) Synchronous speed. (ii) Slip (iii) Rotor frequency at the time of starting. (iv) Rotor frequency at the given speed. (8) Q.7 a. Explain the terms Capacity factor, Maximum load, Annual load factor and Diversity factor. (8) b. What factors are considered for the selection of motor for specific engineering application? (8) Q.8 a. Give a Brief note on the various Renewable Energy Resources. (10) b. If a generating station has a maximum load of 20MW for the year and the maximum load on the substations were 7.5MW, 6.0MW, 5.5MW, & 4.5MW. Calculate the diversity factor. (6) Q.9 Write short notes on (i) Energy storage. (8) (ii) E.M.F equation of 1-Phase transformer. (8) Q.1 Choose the correct or the best alternative in the following: (2x10) a. The super - position theorem is applicable to: (A) Current only (B) Voltage only. (C) Both current and voltage (D) Current, voltage and power. b. The difference between the synchronous speed & the actual speed of an induction motor is known as : (A) Regulation (B) Back lash (C) Slip (D) Lag c. A step up transformer increases (A) Power (B) Power factor (C) Voltage (D) Frequency d. Which d.c. motor has approximately constant speed? (A) Series motor (B) Shunt motor (C) Cumulatively compound motor (D) All of the above e. For three phase star connected circuit (A) Line voltage = Phase Voltage (B) Line current = Phase current (C) Line current =_3 Phase current (D) none of the above DECEMBER 2010 f. A synchronous motor can operate at (A) Lagging power factor only (B) Leading power factor only (C) Unity power factor only. (D) lagging, leading and unity power factor g. In an a.c. circuit, the current (A) is always in phase with the e.m.f. (B) always leads the e.m.f. (C) always lags the e.m.f. (D) Any of the above depending upon the element (L, C, or R) of the circuit h. The speed of a DC motor maybe varied by varying (A) Field current (B) Applied voltage. (C) Resistance in series with armature (D) Any of the above i. what will happen if the back emf of a dc motor suddenly vanishes (A) The motor will run faster than the rated speed (B) The motor will start hunting (C) The efficiency of motor will rise abruptly. (D) The motor will burn j. While the pole flux of d.c shunt generator remains constant the speed is doubled. The emf generated will be (A) four times (B) double (C) unchanged (D) halved Answer any FIVE Questions out of EIGHT Questions. Each question carries 16 marks. Q.2 a. State and explain Kirchhoffs laws? (8) b. A circuit has a resistance of R _ in series with an inductance of L Henries. With a supply of 240V, 50Hz the power in the circuit is 300W and the voltage across R is 100V. Find the value of L. (8) Q.3 a. Derive the E.M.F equation of d c motor? (8) b. The armature of a 4 pole dc machine is required to generate an emf of 520V on open circuit when revolving at a speed of 660rpm. Calculate the magnetic flux per pole required if the armature has 144 slots with 2 coil sides per slot each coil consisting of three turns. The armature is wave wound (8) Q.4 a. Explain the working principle of operation of a single phase transformer. (6) b. A 50kVA , 5000/500V, 50Hz, 1-phase transformer has the high voltage winding with a resistance of 8 _ and low voltage winding with a resistance of 0.06 _ . The no load losses of the transformer amount to 1000W. Calculate the efficiency of the transformer when delivering its full rated output at a power factor of 0.8. (10) Q.5 a. Explain the principle of operation of 3-phase induction motor? (8) b. A 12 pole , 3-phase alternator driven at a speed of 500 rpm supplies power to a 8-pole, 3-phase induction motor. If the slip of the motor at full load is 3%, calculate the full load speed of the motor. (8) Q.6 a. What factors are considered for the selection of motor for specific engineering application? (8) b. Explain application and advantages of storage batteries? (8) Q.7 a. Explain the term (8) (i) Demand factor (ii) Maximum demand (iii) load Factor (iv) Diversity factor b. What are the advantages of high voltage transmission ? Explain (8) Q.8 a. What are the different methods of improvement of power factor (8) b. Explain various modes of power generation ? (8) Q.9 Write short notes on (i) Resonance in R-L-C series circuit. (8) (ii) speed control of D.C shunt motors (8) a. Kirchoff’s current law is applicable only to ________. (A) closed loops in a network (B) junctions in a network (C) electronic circuits (D) electric circuits b. A capacitor-start capacitor-run induction motor is basically a ________ motor. (A) two phase (B) ac series (C) commutator (D) synchronous c. The dynamic impedance of an R-L and C parallel circuit at resonance is ________. (A) C/LR (B) L/CR (C) LC/R (D) R/LC d. The power factor of an a.c. circuit is equal to __________. (A) cosine of the phase angle (B) sine of the phase angle (C) unity for a resistive circuit (D) unity for a reactive circuit e. If the line current in a delta connected system is IL, then phase current will be equal to_________. (A) IL (B) IL/3 (C) 3/IL (D) IL/2 f. Fleming’s left hand rule is applicable to ____________. (A) DC generators (B) DC motors (C) Alternator (D) Transformer g. A three point starter is considered suitable for dc ______ motors. (A) series (B) shunt (C) compound (D) shunt as well as compound h. The two windings of a transformer are __________. (A) conductively linked (B) inductively linked (C) not linked at all (D) electrically linked i. The efficiency of a single-phase transformer under open circuit-test conditions is _________. (A) 100% (B) 0.00% (C) 70.7% (D) 57.7% j. The slip of an induction motor connected to supply, but prevented to rotate by blocking the rotor through external means would be ___________. (A) 100% (B) 0% (C) 3% (D) 50% Answer any FIVE Questions out of EIGHT Questions. Each question carries 16 marks. Q.2 a. Define the following circuit elements: (6) (i) Resistance. (ii) Capacitance. (iii) Inductance. b. Derive the value of the equivalent resistance when a number of resistances are connected in series. (4) c. In the single loop circuit of the fig.1 given below, find the current I. (6) Q.3 a. A circuit consists of a pure resistance of 50 and is connected across ac supply v = 250sin314t. Calculate current in the resistance power consumed by the resistance. Also write the expression for instantaneous value of the current. (8) b. A pure capacitive circuit offers 31.4 capacitive reactance at 25 Hz. Calculate how much current does the circuit draw if its terminals are connected to 230V 50Hz supply? (8) Q.4 a. Explain the construction and working principle of a DC motor. (8) b. A shunt motor takes a current of 40 A from 230 V supply and runs at a speed of 1100rpm. Find the torque developed by the armature if the armature and the shunt field resistances are 0.25 and 23 respectively. (8) Q.5 a. Draw and explain the equivalent circuit of a single phase ideal transformer. (8) b. A 500kVA transformer has 95% efficiency at full load and also at 60% of full load both at unity power factor. (i) Separate out the transformer losses. (ii) Determine the transformer efficiency at 75% full load unity power factor. (8) Q.6 a. Explain split – phase and shaded pole single phase motors with suitable diagrams. (8) b. The full load speed of a 3- phase, 230V 4-pole, 50 Hz induction motor is 1445 rpm. Determine the synchronous speed, slip and rotor frequency. (8) Q.7 a. Write a note on biofuels. (8) b. Give two applications of Shaded pole motor, DC shunt motors, DC series motors, and Capacitor start motors. (8) Q.8 a. Explain a PV cell with a suitable diagram. (8) b. A power station has a maximum demand of 15000kW. The annual load factor is 50% and capacity factor is 40%. Determine the reserve capacity of the plant. (8) Q.9 Write notes on: (i) Application of DC series motors. (ii) Power factor and its improvement. (8+8)
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Re: IETE DIPIETE (old scheme) Electrical Engineering Exam paper
Ok, as you want the question paper of IETE DIPIETE (old scheme) Electrical Engineering Exam so here I am providing you. IETE DIPIETE (old scheme) Electrical Engineering Exam question paper Q.1 Choose the correct or the best alternative in the following: (2 10) a. Kirchoff’s current law is applicable only to ________. (A) closed loops in a network (B) junctions in a network (C) electronic circuits (D) electric circuits b. A capacitor-start capacitor-run induction motor is basically a ________ motor. (A) two phase (B) ac series (C) commutator (D) synchronous c. The dynamic impedance of an R-L and C parallel circuit at resonance is ________. (A) C/LR (B) L/CR (C) LC/R (D) R/LC d. The power factor of an a.c. circuit is equal to __________. (A) cosine of the phase angle (B) sine of the phase angle (C) unity for a resistive circuit (D) unity for a reactive circuit e. If the line current in a delta connected system is IL, then phase current will be equal to_________. (A) IL (B) IL/3 (C) 3/IL (D) IL/2 f. Fleming’s left hand rule is applicable to ____________. (A) DC generators (B) DC motors (C) Alternator (D) Transformer g. A three point starter is considered suitable for dc ______ motors. (A) series (B) shunt (C) compound (D) shunt as well as compound h. The two windings of a transformer are __________. (A) conductively linked (B) inductively linked (C) not linked at all (D) electrically linked i. The efficiency of a single-phase transformer under open circuit-test conditions is _________. (A) 100% (B) 0.00% (C) 70.7% (D) 57.7% j. The slip of an induction motor connected to supply, but prevented to rotate by blocking the rotor through external means would be ___________. (A) 100% (B) 0% (C) 3% (D) 50% Answer any FIVE Questions out of EIGHT Questions. Each question carries 16 marks. Q.2 a. Define the following circuit elements: (6) (i) Resistance. (ii) Capacitance. (iii) Inductance. b. Derive the value of the equivalent resistance when a number of resistances are connected in series. (4) c. In the single loop circuit of the fig.1 given below, find the current I. (6) Q.3 a. A circuit consists of a pure resistance of 50 and is connected across ac supply v = 250sin314t. Calculate current in the resistance power consumed by the resistance. Also write the expression for instantaneous value of the current. (8) b. A pure capacitive circuit offers 31.4 capacitive reactance at 25 Hz. Calculate how much current does the circuit draw if its terminals are connected to 230V 50Hz supply? (8) Q.4 a. Explain the construction and working principle of a DC motor. (8) b. A shunt motor takes a current of 40 A from 230 V supply and runs at a speed of 1100rpm. Find the torque developed by the armature if the armature and the shunt field resistances are 0.25 and 23 respectively. (8) Q.5 a. Draw and explain the equivalent circuit of a single phase ideal transformer. (8) b. A 500kVA transformer has 95% efficiency at full load and also at 60% of full load both at unity power factor. (i) Separate out the transformer losses. (ii) Determine the transformer efficiency at 75% full load unity power factor. (8) Q.6 a. Explain split – phase and shaded pole single phase motors with suitable diagrams. (8) b. The full load speed of a 3- phase, 230V 4-pole, 50 Hz induction motor is 1445 rpm. Determine the synchronous speed, slip and rotor frequency. (8) Q.7 a. Write a note on biofuels. (8) b. Give two applications of Shaded pole motor, DC shunt motors, DC series motors, and Capacitor start motors. (8) Q.8 a. Explain a PV cell with a suitable diagram. (8) b. A power station has a maximum demand of 15000kW. The annual load factor is 50% and capacity factor is 40%. Determine the reserve capacity of the plant. (8) Q.9 Write notes on: (i) Application of DC series motors. (ii) Power factor and its improvement. (8+8) Half question paper is in pdf file.
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