Description : In an A.C. circuit power is dissipated in?

**Answer** : In an A.C. circuit power is dissipated in resistance only.

Description : what is equivalent resistance when four 4 Ohm resistors are connected in i) series ii) parallel

**Answer** : equivalent resistance

Description : The series and parallel resonance on L-C circuit differs in that?

**Answer** : The series and parallel resonance on L-C circuit differs in that series resistance needs a low-resistance source for sharp rise in current.

Description : Explain with neat diagram series and parallel magnetic circuits.

**Answer** : Series magnetic circuit: When different magnetic materials having different lengths, cross sectional areas and permeability are connected one after another, in which same flux is established in different sections, then it is called series ... flux, Φ = Φ1 + Φ2 Path 1: BAFE Path 2: BACD

Description : Series parallel resistances problem solution

**Answer** : Series parallel resistances problem solution

Description : Series and parallel capacitor problem

**Answer** : Series and parallel capacitor problem 1 : https://youtu.be/MSl5mRwtjAE Series and parallel capacitor problem 2 : https://youtu.be/yGwbpyEtIyw Series and parallel capacitor problem 3 : https:// ... https://youtu.be/_7KwEwWqiNU Series and parallel capacitor problem 10 : https://youtu.be/et8MCWV_OyE

Description : State the principle of solar cell. What is necessity of series and parallel connection of solar cells.

**Answer** : Principle of solar cell:- Working:- Solar cell operates on principle of Photo-voltaic effect Solar cell works in following steps: The solar cell is composed of a P-type ... of Voltage & Current rating it is necessity of connecting series and parallel connection of solar cells.

Description : State necessity of series connection and parallel connection of batteries.

**Answer** : Necessity of series connection of batteries: 1. The batteries are available with some specific terminal voltages. e. g. 6V, 12V, 24V, 48V etc. 2. If we want to have some terminal voltage other than ... batteries of capacities I1, I2, I3, I4 . are connected in parallel, all having identical emfs.

Description : Explain the series and parallel operation of MOSFET. Which is suitable and why?

**Answer** : Series operation of MOSFET: To increase voltage handling capability MOSFETs are connected in series. When the MOSFETs are connected in series each MOSFET should turn on and turn off ... on and turn off time and transconductance. Each MOSFET should share current equally.

Description : The power factor at resonance in R-L- C parallel circuit is?

**Answer** : since a rlc circuit at resonance behaves like a pure resistive circuit, i.e there is no phase difference between current and voltage, hence the power factor is unity.

Description : An independent voltage source in series with an impedance ZS=R+jXS delivers a maximum average power to a load impedance ZL when A) ZL = R B) ZL = jXS C) ZL = R-jXS D) ZL = R+jXS

**Answer** : An independent voltage source in series with an impedance ZS=R+jXS delivers a maximum average power to a load impedance ZL when ZL = R-jXS

**Answer** : For the parallel operation of two or more D.C. compound generators, we should ensure that series fields of all generators should be either on positive side or negative side of the armature.

Description : parallel operation of MOSFET can be done more easily as compared to thyristor. why?

**Answer** : Parallel operation of MOSFET can be done more easily as compared to thyristor because the resistance of MOSFET is increases with increase in temperature. MOSFET have the positive temperature coefficient. In ... the parallel operation of MOSFET can be done more easily as compared to the thyristor.

Description : Three 60 W bulbs are in parallel across the 60 V power line. If one bulb burns open?

**Answer** : Three 60 W bulbs are in parallel across the 60 V power line. If one bulb burns open the other two bulbs will light.

Description : Flash or Parallel ADC

**Answer** : Flash or Parallel ADC

**Answer** : If equalising bar is connected to the 2 DC generators the current will be equal in 2 generators irrespective of parallel connection so that we connect equaliser bar

Description : In parallel RLC resonance circuit at resonance the current will be (1) Minimum (2) Maximum (3) Zero (4) Infinite

**Answer** : In parallel RLC resonance circuit at resonance the current will be Minimum

Description : When three resistors with unequal values are connected in parallel, _______ A) The current across the resistors is the same B) The voltage drop across the resistors is the same C) The voltage drops across the resistors is proportional to the resistance of each resistor D) None of these

**Answer** : When three resistors with unequal values are connected in parallel, The voltage drop across the resistors is the same

Description : While keeping the excitation constant, if the steam supply of an alternator running in parallel with another identical alternator is increased, then (A) It would over-run the other alternator (B) Its rotor ... (C) Its portion of share in load will increase (D) Its power factor would be decreased.

**Answer** : While keeping the excitation constant, if the steam supply of an alternator running in parallel with another identical alternator is increased, then Its portion of share in load will increase

Description : With three resistances connected in parallel, if each dissipates 20 W the total power supplied by the voltage source equals?

**Answer** : Power is the only thing which is additive in both connection whether it is parallel or series connection so total power consumed will addition of all individual power =20+20+20 = 60 watt

Description : If a parallel circuit is opened in the main line, the current?

**Answer** : If a parallel circuit is opened in the main line, the current is zero in all branches.

Description : An A.C. voltage is impressed across a pure resistance of 3.5 ohms in parallel with a pure inductance of impedance of 3.5 ohms?

**Answer** : An A.C. voltage is impressed across a pure resistance of 3.5 ohms in parallel with a pure inductance of impedance of 3.5 ohms, both resistance and inductance carry equal currents.

Description : Two non-collinear parallel equal forces acting in opposite direction?

**Answer** : Two non-collinear parallel equal forces acting in opposite direction constitute a couple.

**Answer** : Ammeter is a current measuring device having low internal resistance so as to direct all the current flowing in the circuit through it. Hence Ammeter is always connected in series with the circuit. If ... If Ammeter is connected in parallel with the supply, then the supply will be a short circuit.

Description : A parallel RLC circuit has the node equation Determine v(t) using the phasor method.

**Answer** : A parallel RLC circuit has the node equation Determine v(t) using the phasor method.

Description : Parallel rc circuit

**Answer** : Parallel rc circuit

Description : Parallel circuit rules

**Answer** : Parallel circuit rules

Description : Parallel Reactance and Resistance Example 1

**Answer** : Parallel Reactance and Resistance Example 1

Description : An additional condition for parallel operation of three-phase transformers over single-phase transformers is that

**Answer** : An additional condition for parallel operation of three-phase transformers over single-phase transformers is that the transformers should belong to the same vector group

Description : Consider a circuit with three parallel branches connected across a DC supply. What is the ratio of the branch currents I1 : I2 : I3 if the branch resistances are in the ratio of 2 : 3 : 4 respectively? A) 2 : 3 : 4 B) 6 : 4 : 3 C) 4 : 3 : 2 D) None of these

**Answer** : Consider a circuit with three parallel branches connected across a DC supply. What is the ratio of the branch currents I1 : I2 : I3 if the branch resistances are in the ratio of 2 : 3 : 4 respectively? A) 2 : 3 : 4 B) 6 : 4 : 3 C) 4 : 3 : 2 D) None of these

Description : Explain parallel and wireless protocols.

**Answer** : Parallel protocols: PCI bus (Peripheral Components Interconnect): PCI stands for Peripheral Components Interconnect. PCI bus is used as a communication line to transmit signals and data ... provide the basis for wireless network products using the Wi-Fi brand.

Description : When one leg of parallel circuit is opened out the total current will?

**Answer** : When one leg of parallel circuit is opened out the total current will decrease.

Description : At ______ frequencies the parallel R-L circuit behaves as purely resistive.

**Answer** : At very high frequencies the parallel R-L circuit behaves as purely resistive.

**Answer** : Necessary conditions required to be satisfied in order to ensure successful parallel operation of single phase transformers: 1. Only transformers having the same phase displacement between primary and secondary ... . 7. The phase sequence must be followed strictly on HV and LV side connection.

Description : Also, highlight the problem faced during parallel operation.

**Answer** : Parallel operation of IGBT: Parallel operation of IGBT is done for obtaining high current rating. Paralleling of IGBT reduces conduction losses and thermal stress. IGBT combines the qualities of ... . IGBTs must share losses equally otherwise IGBT may get failure due to thermal differences.

Description : In voltage source converter based HVDC transmission system the active power is controlled by changing (A) phase angle of the converter ac input voltage (B) supply frequency of the converter ac input voltage (C) magnitude of the converter ac input voltage (D) DC voltage at the inverter terminals

**Answer** : In voltage source converter based HVDC transmission system the active power is controlled by changing phase angle of the converter ac input voltage

Description : Why high voltage is used in power transmission?

**Answer** : The primary reason that power is transmitted at high voltages is to increase efficiency. ... The lower current that accompanies high voltage transmissionreduces resistance in the conductors aselectricity flows ... This means that thin, light-weight wires can beused in long-distance transmission.

Description : A Unified Power Flow Controller (FACTS controller) is a voltage source converter based (A) Inter-phase power controller (B) Static Compensator (C) Combination of series and shunt compensators (D) Solid-state series compensator

**Answer** : A Unified Power Flow Controller (FACTS controller) is a voltage source converter based Combination of series and shunt compensators

Description : How do you calculate power loss?

Description : Why high voltage can reduce power loss?

**Answer** : when voltage has increased due to reduced current flow, thus power loss given by ( I^2R) will be low due to reduced current(I^2) provided that resistance (R) is constant.

Description : State the modification to be done in dc series motor to work satisfactorily as ac series motor. State applications of ac series motor.

**Answer** : Modifications are necessary in a dc series motor so that it operates satisfactorily on ac supply. The modifications are as follows: 1) AC series motor is built with a few field turns as ... and grinders 5) High speed vacuum cleaners 6) Sewing machines 7) Food processors 8) Drilling machine

Description : Source transformation Replace the circuit with voltage source in series with a single resistor

**Answer** : Source transformation Replace the circuit with voltage source in series with a single resistor

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