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Explain series switching control of AC load.

  1. Single phase resistance load - Integral half cycle control
  2. Phase control - Resistance load
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Explain the principle of ON-OFF control and phase control of AC voltage controller with suitable circuit and waveforms.

Answer :

The integral cycle control (on-off control) and phase angle control are the two types of AC voltage controller. The principle of ON-OFF control: The on-off control is also called an integral cycle ... control. In phase control, the switch is on for some period of each cycle.  

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

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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 

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Series capacitors on transmission lines are of little use when the load VAR requirement is small.

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Why dc series motor should not be started at no load?

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Explain switching model of MOSFET.

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Explain space vector transformation and space vector switching with the help of diagram. What are the advantages of SVM?

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For given maximum axle load tractive efforts of AC. locomotive will be more than that of D.C. locomotive.

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A.C. series motor as compared to D.C. series motor has smaller brush width, less number of field turns, more number of armature turns, less air gap.

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If a D.C. series motor is operated on A.C. supply, it will spark excessively, have poor efficiency, have poor power factor.

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In a A.C. series motor armature coils are usually connected to commutator through resistance.

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In A.C. series motor compensating winding is employed to reduce sparking at the brushes.

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Explain the concept of initial and final conditions in switching for L and C.

Answer :

i) Inductor: The current through an inductor cannot change instantly. If the inductor current is zero just before switching, then whatever may be the applied voltage, just after switching the inductor ... open-circuit.  The initial and final conditions are summarized in following table:

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Switching of a lamp in house produces noise in the radio. This is because switching operation produces?

Answer :

Switching of a lamp in house produces noise in the radio. This is because switching operation produces arcs across separating contacts.

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What is a switching impulse?

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What is mean by power switching devices?

Answer :

Power switching devices means like BJT, power MOSFET, SCR, TRIAC, GTO etc.

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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.  

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Explain working of static AC circuit breaker. 

Answer :

Static AC Circuit breaker: The circuit configuration of static AC circuit breaker using SCR is shown in the figure. When switch S' is closed, the SCRs T1 and T2 are fired in positive ... non-availability of gate current. Thus the maximum time delay for breaking the circuit is one half-cycle.

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Explain working of AC circuit breaker using SCR with circuit diagram.

Answer :

AC Circuit Breaker:  The circuit configuration of static AC circuit breaker using SCR is shown in the figure. When switch S' is closed, the SCRs T1 and T2 are fired in positive ... to non-availability of gate current. Thus the maximum time delay for breaking the circuit is one half-cycle.

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Speed control of the motor using TRIAC

Answer :

Speed control of the motor using TRIAC:  This basic phase triggering circuit uses the triac in series with the motor across an AC sinusoidal supply. The variable resistor, VR1 is used ... meaning that it may not trigger at the exact same point for each positive and negative half cycle.

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What is a phase control thyristor?

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What are the disadvantages of the linear regulator? how are they overcome in the switching regulator? What is continuous and discontinuous mode switching regulator?

Answer :

Disadvantages of the linear regulator: Linear regulator waste power in the form of heat. Linear regulator has very low efficiency. Linear regulator cannot be used for the step ... between continuous mode and discontinuous mode switching regulator.

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Draw the structural diagram of GTO. Explain briefly the switching behavior of GTO with the help of appropriate voltage and current waveform.

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Gate Turn Off Thyristor (GTO) Conventional Thyristor can be turned on with gate terminal but can not turn off from gate terminal. But in case of Gate Turn Off Thyristor (GTO), we can turn it on and off ... subdivided as storage period (Ts), fall period (Tp) and tail period (Tt).

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In an ac series RLC circuit, the voltage across R and L is 20 V; voltage across L and C is 9 V and voltage across RLC is 15 V. What is the voltage across C?

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In an ac series RLC circuit, the voltage across R and L is 20 V; voltage across L and C is 9 V and voltage across RLC is 15 V. What is the voltage across C? 7 V

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In a 2 kW, 200 V, 1000 rpm. DC series motor the torque at full load was found to be 0.3 N -m. The torque at half full load in N -m is :

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In a 2 kW, 200 V, 1000 rpm. DC series motor the torque at full load was found to be 0.3 N -m. The torque at half full load in N -m is : 0.075

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The SCR would be turned OFF by voltage reversal of applied anode-cathode ac supply frequency of A) 10 kHz B) 10 Hz C) 5 kHz D) 5 Hz 

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How is a thyristor used to convert AC to DC?

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Can transformer convert AC to DC?

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No, Transformer cannot convert AC to DC.

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NO IT ONLY CONVERT FROM AC TO DC BECAUSE DIODE WHICH ARE USED IN IT, ARE UNIDIRECTIONAL.

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IT CHANGES NEGATIVE CYCLE IN TO POSITIVE CYCLE FROM AC CURRENT.

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A balanced Delta connected load supplied with 440 V 50 Hz three phase AC supply has R=10 Ohm and L=0.6 mH in is each arm. Calculate line and phase current, active power.

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Draw the labeled block diagram of process control system and explain each block.

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Explanation - Process control system consists of process or plant, sensor, error detector, automatic Controller, actuator or control element. 1) Process or plant- process means some manufacturing sequence ... process which changes the process variable. Output of this block is denoted by u .

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Draw and explain bulk correction method for power factor & control.

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Bulk correction method for power factor & control: i) Here individual starter controls the capacitors located at distribution panel. ii) Centralized compensation is employed in large industrial plants where many ... capacitor units in steps to maintain P.F. more than preset limit (0.95). 

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Explain spring control method with neat diagram.

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Spring Control Method: As shown in the figure the inner ends of the both springs are attahced to the spindle ,while outer end of upper spring is attached to the lever and outer end of ... the springs are twisted in opposite direction to the motion of pointer and produce controlling torque.

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Total instantaneous power supplied by a 3-phase ac supply to a balanced R-L load is

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Total instantaneous power supplied by a 3-phase ac supply to a balanced R-L load is constant

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Single-phase mid-point controlled rectifier with RL load

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Single-phase mid-point controlled rectifier with RL load : The circuit configuration of single-phase midpoint controlled rectifier is shown in the figure. During positive half-cycle of ... some part of next positive half-cycle of voltage with reversed polarity can appear across load.

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Single-phase Midpoint controlled rectifier with Resistive load

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Single-phase Midpoint controlled rectifier with Resistive load:  1) During positive half cycle of AC supply, a is positive with respect to b , this makes T1 forward biased and T2 is reverse ... voltage reverses the polarity and T2 is turned off. The operation is as shown in waveforms.

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A single-phase voltage source square -wave inverter feeds pure inductive load. The waveform of the load current will be

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A single-phase voltage source square -wave inverter feeds pure inductive load. The waveform of the load current will be triangular

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A 3 -phase, fully controlled, converter is feeding power into a DC load at a constant current of 150 A, the rms value of the current flowing through each thyristor of the converter is

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A 3 -phase, fully controlled, converter is feeding power into a DC load at a constant current of 150 A, the rms value of the current flowing through each thyristor of the converter is 150/√3

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Give the circuit analysis of current source inverter with resistive load. What are the main difference between voltage source inverter and current source inverter?

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Current source inverter (CSI): In current source inverter, the output current is independent of load. The input current of current source inverter is constant. Current source converter converts DC input current to ... are connected in parallel. In CSI diodes are connected in series.

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Explain with neat diagram series and parallel magnetic circuits. 

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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

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Explain construction and working of AC servomotor.

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Construction of AC Servo Motor: AC servo motor is mainly composed of a stator and a rotor. Laminated stator core is usually made of silicon steel. Two phase windings are placed in the stator slots at 90 degree ... on rotor. Due to the force or torque acting on the rotor, it is set in motion. 

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Explain how sinusoidal AC voltage is generated by using simple one loop generator.

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An electric current produced by means of electrical machine is known as generator which converts mechanical energy into electrical energy. When conductor cuts the magnetic flux, emf induced in it. (Faraday' ... upon position of armature. The nature of emf is alternating as shown by the waveform. 

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Do you think is DC better than AC to transmit energy?

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In Long distance DC transmission will be better in cost. It requires more equipments for flexiblity In short distance AC transmission is better in  cost. It is more Flexible

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Explain power in single phase AC circuit.

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Explain MCB and ELCB with connection diagram supplying single phase load. 

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OR OR Explanation: * MCB provides short circuit protection. * MCB provides overload protection * ELCB provides earth fault protection. * MCB is in series with ... occurs, the ELCB cuts off the power within the time of 0.1 sec. automatically to protect the personnel. 

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Explain with neat circuit diagrams the procedures to perform no load and blocked rotor tests on three phase induction motor.

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1. Connected Load: It is the sum of load of all equipment's connected to supply system which are in use or not in use of each consumer. OR   The sum of connected load of all consumers ... is the maximum load which a consumer uses at a particular time period out of his total connected load. 

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Explain with diagram load duration curve.

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It is drawn from load curve. It is graph of load (MW/KW) arranged in descending order of magnitude with respect to time. 

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