ELECTRICAL GURU

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What is the main disadvantage of phase advancers?  a. Cannot be used for motors below 200 H.P b. Produces noise c. Can be used where synchronous motor is un admissible d. None of these ANSWER: Cannot be used for motors below 200 H.P Phase advancers are used for which among the following machines?  a. Transformers b. Synchronous machines c. Induction motors d. DC machines ANSWER: Induction motors Which among these is the advantage of synchronous condensers?  a. Helps in achieving the stepless control of power factor. b. The motor windings have a lower thermal stability. c. The maintenance cost is low. d. All of the above. ANSWER: Helps in achieving the stepless control of power factor. What is the advantage of the static capacitors? a. Low losses b. Easy installation c. Lower maintenance d. All of the above ANSWER: All of the above Power factor can be improved by connecting which among these?  a. Static capacitors. b. Resistors. c. Synchronous condensers. d. Both (a) and (c). ANSWER: Both (a) and (c). For which among the following consumers is penalty imposed for low power factor?  a. Residential and commercial consumers. b. Industrial consumers. c. Agricultural consumers. d. All of the above. ANSWER: Industrial consumers. The primary reason for the low power factor is due to the installation of  a. Induction motors b. DC motors c. Synchronous motors d. Commutator motors ANSWER: Induction motors For a consumer what is the most economical power factor?  a. 0.25 – 0.5 lagging b. 0.25 – 0.5 leading c. 0.85 – 0.95 lagging d. 0.85 – 0.95 leading ANSWER: 0.85 – 0.95 lagging Lower power factor is usually not due to ____________.  a. Discharge lamp b. Arc lamps c. Incandescent lamps d. Induction furnace ANSWER: Incandescent lamps Which among the following happens in a low power factor?  a. Large kVA rating of the equipment. b. Greater conductor size. c. Reduced handling capacity of the system. d. All of the above. ANSWER: All of the above @mahadiscomAEJE

J B Gupta https://drive.google.com/file/d/0Byw1ZH5X5baNeXpKTEhydE9lclk/view?usp=drivesdk https://t.me/engineerpirates Modern power electronics and AC drives B K Bose https://drive.google.com/file/d/0B8a7R-HvXjPadl9jVjFDZ2pQcEE/view?usp=sharing https://t.me/engineerpirates High Voltage Engineering Naidu Kamaraju https://drive.google.com/file/d/0B8a7R-HvXjPaTzBCWExPMXcxakE/view?usp=sharing https://t.me/engineerpirates Electrical Engineering Objective R.K.Rajput https://drive.google.com/file/d/0Byw1ZH5X5baNNVRneEthMlBSdEU/view?usp=drivesdk https://t.me/engineerpirates Electrical Machines only Objective by Bimbra https://drive.google.com/file/d/0B8a7R-HvXjPacWx2MTM2R0tiTGM/view?usp=sharing https://t.me/engineerpirates HIGH VOLTAGE AND ELECTRICAL INSULATION ENGINEERING by RAVINDRA ARORA https://drive.google.com/file/d/0B8a7R-HvXjPaNk5SUTdudVVuSEE/view?usp=sharing https://t.me/engineerpirates Electrical Engineering Objective Handa & Handa https://drive.google.com/file/d/0Byw1ZH5X5baNWU0ybHppQ2hfd28/view?usp=drivesdk https://t.me/engineerpirates Engineering Electromagnetics Bill Hayt and John Buck's https://drive.google.com/file/d/0B8a7R-HvXjPaZnRJNjhST2YtajQ/view?usp=sharing https://t.me/engineerpirates THYRISTOR-BASED FACTS CONTROLLERS FOR ELECTRICAL TRANSMISSION SYSTEMS Mathur & Varma https://drive.google.com/file/d/0B8a7R-HvXjPaMXRtb0R6VVJxM1k/view?usp=sharing https://t.me/engineerpirates Electrical Engineering Objective VK Mehta https://drive.google.com/file/d/0Byw1ZH5X5baNVzVoUVI5Y19ubEU/view?usp=drivesdk https://t.me/engineerpirates Power Generation, Operation, and Control Allen J. Wood https://drive.google.com/file/d/0B8a7R-HvXjPaVEk4ZFhZNVR2RnM/view?usp=sharing https://t.me/engineerpirates Power System Stability And Control by Prabha Kundur https://drive.google.com/file/d/0B8a7R-HvXjPaTktGNl96eUlNYnc/view?usp=sharing https://t.me/engineerpirates Feedback Control Theory John Doyle, Bruce Francis, Allen Tannenbaum https://drive.google.com/file/d/0B8a7R-HvXjPaT2tzRmVYbHRYdGs/view?usp=sharing https://t.me/engineerpirates Power System Dynamics and Stability Peter Sauer & M Pai https://drive.google.com/file/d/0B8a7R-HvXjPaNWpKUDAxVi15a1U/view?usp=sharing https://telegram.me/engineerpirates ELECTRIC MOTOR DRIVES Modeling, Analysis, and Control R. Krishnan https://drive.google.com/file/d/0B8a7R-HvXjPaS05RdE1DcGMwV0U/view?usp=sharing https://t.me/engineerpirates Electric Machines and Drives by NED MOHAN https://drive.google.com/file/d/0B8a7R-HvXjPaSmZhSXJ1TlQ5NHM/view?usp=sharing https://t.me/engineerpirates POWER SYSTEM DYNAMICS Stability and control K R Padiyar https://drive.google.com/file/d/0B8a7R-HvXjPaZ1QyRmZ3cDMzM3c/view?usp=sharing https://t.me/engineerpirates Electrical and Electronic Measurements and Instrumentation A.K.Sawhney https://drive.google.com/file/d/0B8a7R-HvXjPaamtxQktZZ1VKUXM/view?usp=sharing https://t.me/engineerpirates Fundamentals of Electrical Drives G.K.Dubey https://drive.google.com/file/d/0B8a7R-HvXjPaMF9VazdQNTJQTUE/view?usp=sharing https://t.me/engineerpirates First Course on Electrical Drives S.K.Pillai https://drive.google.com/file/d/0B8a7R-HvXjPaSDNVdl9Id3FqdjQ/view?usp=sharing https://t.me/engineerpirates Finite Element Analysis by S.S. Bhavikatti https://drive.google.com/file/d/0B8a7R-HvXjPaY1N2bWx6RGZJeTA/view?usp=sharing https://t.me/engineerpirates

J B Gupta https://drive.google.com/file/d/0Byw1ZH5X5baNeXpKTEhydE9lclk/view?usp=drivesdk https://t.me/engineerpirates Modern power electronics and AC drives B K Bose https://drive.google.com/file/d/0B8a7R-HvXjPadl9jVjFDZ2pQcEE/view?usp=sharing https://t.me/engineerpirates High Voltage Engineering Naidu Kamaraju https://drive.google.com/file/d/0B8a7R-HvXjPaTzBCWExPMXcxakE/view?usp=sharing https://t.me/engineerpirates Electrical Engineering Objective R.K.Rajput https://drive.google.com/file/d/0Byw1ZH5X5baNNVRneEthMlBSdEU/view?usp=drivesdk https://t.me/engineerpirates Electrical Machines only Objective by Bimbra https://drive.google.com/file/d/0B8a7R-HvXjPacWx2MTM2R0tiTGM/view?usp=sharing https://t.me/engineerpirates HIGH VOLTAGE AND ELECTRICAL INSULATION ENGINEERING by RAVINDRA ARORA https://drive.google.com/file/d/0B8a7R-HvXjPaNk5SUTdudVVuSEE/view?usp=sharing https://t.me/engineerpirates Electrical Engineering Objective Handa & Handa https://drive.google.com/file/d/0Byw1ZH5X5baNWU0ybHppQ2hfd28/view?usp=drivesdk https://t.me/engineerpirates Engineering Electromagnetics Bill Hayt and John Buck's https://drive.google.com/file/d/0B8a7R-HvXjPaZnRJNjhST2YtajQ/view?usp=sharing https://t.me/engineerpirates THYRISTOR-BASED FACTS CONTROLLERS FOR ELECTRICAL TRANSMISSION SYSTEMS Mathur & Varma https://drive.google.com/file/d/0B8a7R-HvXjPaMXRtb0R6VVJxM1k/view?usp=sharing https://t.me/engineerpirates Electrical Engineering Objective VK Mehta https://drive.google.com/file/d/0Byw1ZH5X5baNVzVoUVI5Y19ubEU/view?usp=drivesdk https://t.me/engineerpirates Power Generation, Operation, and Control Allen J. Wood https://drive.google.com/file/d/0B8a7R-HvXjPaVEk4ZFhZNVR2RnM/view?usp=sharing https://t.me/engineerpirates Power System Stability And Control by Prabha Kundur https://drive.google.com/file/d/0B8a7R-HvXjPaTktGNl96eUlNYnc/view?usp=sharing https://t.me/engineerpirates Feedback Control Theory John Doyle, Bruce Francis, Allen Tannenbaum https://drive.google.com/file/d/0B8a7R-HvXjPaT2tzRmVYbHRYdGs/view?usp=sharing https://t.me/engineerpirates Power System Dynamics and Stability Peter Sauer & M Pai https://drive.google.com/file/d/0B8a7R-HvXjPaNWpKUDAxVi15a1U/view?usp=sharing https://telegram.me/engineerpirates ELECTRIC MOTOR DRIVES Modeling, Analysis, and Control R. Krishnan https://drive.google.com/file/d/0B8a7R-HvXjPaS05RdE1DcGMwV0U/view?usp=sharing https://t.me/engineerpirates Electric Machines and Drives by NED MOHAN https://drive.google.com/file/d/0B8a7R-HvXjPaSmZhSXJ1TlQ5NHM/view?usp=sharing https://t.me/engineerpirates POWER SYSTEM DYNAMICS Stability and control K R Padiyar https://drive.google.com/file/d/0B8a7R-HvXjPaZ1QyRmZ3cDMzM3c/view?usp=sharing https://t.me/engineerpirates Electrical and Electronic Measurements and Instrumentation A.K.Sawhney https://drive.google.com/file/d/0B8a7R-HvXjPaamtxQktZZ1VKUXM/view?usp=sharing https://t.me/engineerpirates Fundamentals of Electrical Drives G.K.Dubey https://drive.google.com/file/d/0B8a7R-HvXjPaMF9VazdQNTJQTUE/view?usp=sharing https://t.me/engineerpirates First Course on Electrical Drives S.K.Pillai https://drive.google.com/file/d/0B8a7R-HvXjPaSDNVdl9Id3FqdjQ/view?usp=sharing https://t.me/engineerpirates Finite Element Analysis by S.S. Bhavikatti https://drive.google.com/file/d/0B8a7R-HvXjPaY1N2bWx6RGZJeTA/view?usp=sharing https://t.me/engineerpirates

Mahadiscom AE/JE: For the parallel operation of three phase transformers, which among the following connection is not applicable?  - Published on 30 Oct 15 a. Δ - Δ to Y – Y b. Y - Δ to Δ - Y c. Y - Y to Y – Y d. None of these ANSWER: None of these While connecting three phase transformer in star-star connection, the terminals of secondaries are wrongly joined. Then the mutual phase angle and magnitude of line to line voltages of secondaries will  - Published on 30 Oct 15 a. Equal to 120 degree and equal as before b. Not equal to 120 degree and different c. Equal to 120 degree and different d. None of these ANSWER: Not equal to 120 degree and different For the star - star connection of three phase transformer, the phase angle between the phase voltages and line voltages on both primary and secondary side is  - Published on 30 Oct 15 a. 0 degree b. 30 degree c. 60 degree d. 120 degree ANSWER: 30 degree   A bank of three single phase transformer can be used for obtaining the three phase output. Three magnetic circuits produced in case of a bank of three single phase transformer and in case of single phase transformer are  - Published on 30 Oct 15 a. Linked, independent b. Independent, linked c. Linked, linked d. Both are independent ANSWER: Independent, linked In a three phase transformer, the current flowing in three primaries produces three corresponding fluxes. The sum of these three fluxes at any instant is  - Published on 30 Oct 15 a. Zero b. Three times of any individual flux c. One third of any individual flux d. None of these ANSWER: Zero In a three phase transformer, the angle between two consecutive cores is  - Published on 30 Oct 15 a. 30 degree b. 60 degree c. 120 degree d. 150 degree ANSWER: 120 degree Pulse transformers are small in size. The leakage inductance and permeability of alloy used is  - Published on 30 Oct 15 a. Low, high b. Low, low c. High, low d. High, high ANSWER: Low, high Small iron core transformers used in certain frequency range is also called audio frequency transformer. The audio frequency range is  - Published on 30 Oct 15 a. 20 t0 2000 Hz b. 20 to 20000 Hz c. 2 to 2000 Hz d. 200 to 20000 Hz ANSWER: 20 to 20000 Hz The high leakage impedance transformers are suitable for the applications of  - Published on 30 Oct 15 a. Arc welding b. Personal computers c. Street lights d. Electric lamp ANSWER: Arc welding The constant current transformer are mainly used for  - Published on 30 Oct 15 a. Supplying series connected street light b. Personal computers c. Arc welding d. Electric toys ANSWER: Supplying series connected street light @mahadiscomAEJE

For the parallel operation of three phase transformers, which among the following connection is not applicable?  - Published on 30 Oct 15 a. Δ - Δ to Y – Y b. Y - Δ to Δ - Y c. Y - Y to Y – Y d. None of these ANSWER: None of these While connecting three phase transformer in star-star connection, the terminals of secondaries are wrongly joined. Then the mutual phase angle and magnitude of line to line voltages of secondaries will  - Published on 30 Oct 15 a. Equal to 120 degree and equal as before b. Not equal to 120 degree and different c. Equal to 120 degree and different d. None of these ANSWER: Not equal to 120 degree and different For the star - star connection of three phase transformer, the phase angle between the phase voltages and line voltages on both primary and secondary side is  - Published on 30 Oct 15 a. 0 degree b. 30 degree c. 60 degree d. 120 degree ANSWER: 30 degree   A bank of three single phase transformer can be used for obtaining the three phase output. Three magnetic circuits produced in case of a bank of three single phase transformer and in case of single phase transformer are  - Published on 30 Oct 15 a. Linked, independent b. Independent, linked c. Linked, linked d. Both are independent ANSWER: Independent, linked In a three phase transformer, the current flowing in three primaries produces three corresponding fluxes. The sum of these three fluxes at any instant is  - Published on 30 Oct 15 a. Zero b. Three times of any individual flux c. One third of any individual flux d. None of these ANSWER: Zero In a three phase transformer, the angle between two consecutive cores is  - Published on 30 Oct 15 a. 30 degree b. 60 degree c. 120 degree d. 150 degree ANSWER: 120 degree Pulse transformers are small in size. The leakage inductance and permeability of alloy used is  - Published on 30 Oct 15 a. Low, high b. Low, low c. High, low d. High, high ANSWER: Low, high Small iron core transformers used in certain frequency range is also called audio frequency transformer. The audio frequency range is  - Published on 30 Oct 15 a. 20 t0 2000 Hz b. 20 to 20000 Hz c. 2 to 2000 Hz d. 200 to 20000 Hz ANSWER: 20 to 20000 Hz The high leakage impedance transformers are suitable for the applications of  - Published on 30 Oct 15 a. Arc welding b. Personal computers c. Street lights d. Electric lamp ANSWER: Arc welding The constant current transformer are mainly used for  - Published on 30 Oct 15 a. Supplying series connected street light b. Personal computers c. Arc welding d. Electric toys ANSWER: Supplying series connected street light

)   Due to overdamping, the instrument will become  - Published on 04 Nov 15 a. Slow b. Lethargic c. Fast d. Both (a) and (b) e. None of these ANSWER: Both (a) and (b) A differential relay comparator used for the protection of three phase transformers has  - Published on 30 Oct 15 a. One comparator b. Two comparator c. Three comparator d. Six comparator ANSWER: Three comparator In double delta transformation, a double delta refers to the case where there are two delta transformations in  - Published on 30 Oct 15 a. Parallel b. Series c. Both series and parallel d. Neither series nor parallel ANSWER: Series Most familiar application of zig - zag transformer is as  - Published on 30 Oct 15 a. Ground reference on an ungrounded system b. Converting single phase to two phase c. Reducing harmonics d. All of these ANSWER: Ground reference on an ungrounded system In a single phase, full wave bridge circuit and in three phase, delta full wave bridge circuit, the ripple voltage frequency is always  - Published on 30 Oct 15 a. Twice the line frequency, six times the line frequency b. Both will be twice the line frequency c. Both will be six times the lines frequency d. None of these ANSWER: Twice the line frequency, six times the line frequency In Scott connection, the voltage across the teaser leads the mains by  - Published on 30 Oct 15 a. 30 degree b. 60 degree c. 90 degree d. 120 degree ANSWER: 90 degree In T-T connection, the ratio of actual capacity to the available capacity is  - Published on 30 Oct 15 a. 1 b. 0.928 c. 1.928 d. 0.5 ANSWER: 0.928 Scott connection is used for the conversion of  - Published on 30 Oct 15 a. Single phase to three phase b. Three phase to single phase c. Single phase to two phase d. All of these ANSWER: Single phase to two phase In T-T connection, the percentage tapping of main transformer and teaser transformer are  - Published on 30 Oct 15 a. 50%, 86.6% b. 50%, 50% c. 86.6%, 86.6% d. 86.6%, 50% ANSWER: 50%, 86.6% With a bank of two single phase transformers connected in V - V fashion supplying a balanced three phase load with Cosφ as power factor. The power factor of the two transformers is given by  - Published on 30 Oct 15 a. Cosφ , Cosφ b. Cosφ, Cos(30+φ) c. Cos(30-φ), Cos(30+φ) d. Cos(30-φ), Cosφ ANSWER: Cos(30-φ), Cos(30+φ)

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