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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.

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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

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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.

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D.C. generators are connected to the busbars or disconnected from them only under the floating condition to avoid sudden loading of the primemover, to avoid mechanicaljerk to the shaft, to avoid burning of switch contacts.

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D.C. generators are normally designed for maximum efficiency around full-load.

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

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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

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

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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.

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In D.C. generators the polarity of the interpoles is the same as that of the main pole ahead.

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Compensating windings are used in D.C. generators to neutralise the cross-magnetising effect of the armature reaction.

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In D.C. generators, the brushes on commutator remain in contact with conductors which lie under interpolar region.

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In D.C. generators, current to the external circuit from armature is given through commutator commutator.

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In D.C. generators the pole shoes are fastened to the pole core by counter sunk screws.

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D.C. generators are installed near the load centres to reduce line losses.

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Differentially compound D.C. motors can find applications requiring low starting torque.

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

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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.  

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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.

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Identify the increasing order of voltage regulation of the following dc generators a same load :  (A) differential compound, shunt and under compound  (B) shunt, differential compound and under compound  (C) under compound, shunt and differential compound  (D) shunt, under compound and differential compound

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Identify the increasing order of voltage regulation of the following dc generators a same load : under compound, shunt and differential compound 

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In DC generators lamination core are generally made of?

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In DC generators lamination core are generally made of silicon steel.

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Two synchronous generators G1, G2 are operating in parallel and are equally sharing KVAR (Lag) component of load. To shift part of KVAR from G2 to G1, while keeping terminal voltage fixed, the following action must be done

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Two synchronous generators G1, G2 are operating in parallel and are equally sharing KVAR (Lag) component of load. To shift part of KVAR from G2 to G1, while keeping terminal voltage fixed, the following action must be done Raise If1 and lower If2

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Two synchronous generators operating in parallel supply a common load of 2.5 MW. The frequency-power characteristics have a common slope of 1 MW/Hz and the no-load frequencies of the generators are 51.5 Hz and 51.0 Hz, respectively. Then the system frequency is (A) 50 Hz (B) 51 Hz (C) 51.25 Hz (D) 51.5 Hz

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Two synchronous generators operating in parallel supply a common load of 2.5 MW. The frequency-power characteristics have a common slope of 1 MW/Hz and the no-load frequencies of the generators are 51.5 Hz and 51.0 Hz, respectively. Then the system frequency is 50 Hz

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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

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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

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Four Quadrant Operation Of DC Motor

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Four Quadrant Operation Of DC Motor

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What is the smallest unit of a compound with the same chemical characteristics?

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The molecule is the smallest unit of a compound with the same chemical characteristics.

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Is more power dissipated in series or parallel?

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In D.C. generators on no-load, the air gap flux distribution in space is flat topped.

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Generators for peak load plants are usually designed for maximum efficiency at 50 to 75 percent full load.

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State any two conditions for parallel operation of 3-phase transformer.

Answer :

Conditions for Parallel operation of 3 phase transformer 1) Voltage ratings of both the transformers must be identical. 2) Percentage or p.u. impedance should be equal in magnitude. 3) X/R ratio ... between primary & secondary voltages must be same. 6) Phase sequence on both sides must be same.

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Why are generators rated in kVA not in kW ?

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Because It's rating of generator kva is apparent power. Kw is active power which we use. And one is kvar reactive power.

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Large capacity generators are invariably hydrogen cooled.

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

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

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Flash or Parallel ADC

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

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A four-quadrant operation requires two full converters connected in Parallel 

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(B) Software Configuration Management Process

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In case of a 4-pole D.C. generator provided with a two layer lap winding with sixteen coils, the pole pitch will be 8.

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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?

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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.

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

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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.

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Which of the following thyristors can be used for high frequency of operation? A) TRIAC B) DIAC C) SCR D) GTO 

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Which of the following thyristors can be used for high frequency of operation? A) TRIAC B) DIAC C) SCR D) GTO 

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What would happen if a power transformer designed for operation on 50 Hz (frequency) were connected to a 500 Hz (frequency) source of the same voltage:  (A) Eddy Current and Hysteresis losses will be excessive  (B) Current will be too much high  (C) Transformer may start to smoke and burn  (D) No effect

Answer :

What would happen if a power transformer designed for operation on 50 Hz (frequency) were connected to a 500 Hz (frequency) source of the same voltage:  (A) Eddy Current and Hysteresis losses will be ... will be too much high  (C) Transformer may start to smoke and burn  (D) No effect

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When two D.C. series motors are connected in parallel, the resultant speed is normal speed.

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Answer: B Na tional Knowledge Commission of the Government of India on Higher Education lays down certain guidelines for the betterment of the system. The NK C recommendations on higher education ... sector in the country, and providing access to higher education for larger numbers of students. 

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Which of the following provides the best description of an entity type? (A) A specific concrete object with a defined set of processes (e.g. Jatin with diabetes) (B) A value given to a particular attribute (e.g. height-230 cm) (C) A thing that we wish to collect data about zero or more, possibly real world examples of it may exist. (D) A template for a group of things with the same set of characteristics that may exist in the real world

Answer :

Answer: D

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D.C. generator generally preferred for charging automobile batteries is long shunt compound generator.

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For a D.C. generator when the number of poles and the number of armature conductors is fixed, then which winding will give the higher e.m.f. ?

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Wave winding

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The condition for maximum efficiency for a D.C. generator is variable losses equal to constant losses.

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

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

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