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What is mean by power switching devices?
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Power switching devices means like BJT, power MOSFET, SCR, TRIAC, GTO etc.
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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 arcs across separating contacts.

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Explain switching model of MOSFET.

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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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The resolving power of a spectrometer consisting of collimator, a grating and a telescope can be increased by decreasing the period of the grating

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What are the types of power losses in inductor?

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Copper losses, Eddy current loss, and hysteresis loss are the types of power losses in inductor.

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What is meant by power dip?

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What is meant by feeder in power system?

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A feeder line is a peripheral route or branch in a network which connects smaller or more remote nodes with a route or branch carrying heavier traffic. The term is applicable to any system based on a hierarchical network.

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A waveguide termination having VSWR of 1.1 is used to dissipate 100 watts of power. The reflected power will be A) 0.2268 W B) 0.5868 W C) 0.3468 W D) 0.4568 W 

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A waveguide termination having VSWR of 1.1 is used to dissipate 100 watts of power. The reflected power will be 0.2268 W

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The total power of an AM transmitter having a carrier power of 50 W and the percentage of modulation at 80% is 66 W

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A snubber circuit is connected to the power semiconductor device to reduce the (A) turn-on time (B) turn-off time (C) electrical stresses (D) thermal resistance

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A snubber circuit is connected to the power semiconductor device to reduce the electrical stresses

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MOSFET have high current losses due to High on state resistance. Hence MOSFET is used for low power applications.

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Explain energy conservation technique “by improving power quality” for induction motor.

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Energy conservation method in induction motor by improving power quality: Electrical energy can be conserved by improving the power quality. It can be achieved by avoiding voltage unbalance, maintaining ... losses can be minimized by using harmonic filter thus reducing the harmonics in the system.

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Three-phase electric power is the most common method used by electrical grids to transfer power. 

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The stability of the power system is not affected by  (1) generator reactance (2) line reactance (3) line losses (4) output torque

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The stability of the power system is not affected by line losses

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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

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Answer :

The power consumed by a balanced 3-ph load is measured by two-wattmeter method. The meter readings are 8 kW and 4 kW. The power factor of the load is between 0.5 and unity

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steady-state stability of a power system is improved by

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steady-state stability of a power system is improved by using double circuit line instead of single circuit line

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The mechanical power developed by the armature of a d.c. motor is equal to?

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The mechanical power developed by the armature of a d.c. motor is equal to armature current multiplied by back e.m.f.

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The apparent power drawn by an A.C. circuit is 10 kVA and active power is 8 kW. The reactive power in the circuit is 6 kVAR.

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In case of locomotives the tractive power is provided by double cylinder, double acting steam engine.

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The electrical power to a meggar is provided by permanent magnet D.C. generator.

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In a 3-phase power measurement by two wattmeter method the reading of one of the wattmeter was zero. The power factor of the load must be 0.5.

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In a 3-phase power measurement by two wattmeter method, both the watt meters had identical readings. The power factor of the load was?

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In a 3-phase power measurement by two wattmeter method, both the watt meters had identical readings. The power factor of the load was unity.

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The mechanical power developed by a shunt motor will be maximum when the ratio of back e.m.f. to applied voltage is 0.5.

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Approximate estimation of power demand can be made by load survey method, statistical methods, mathematical method, economic parameters.

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The inductive interference between power and communication line can be minimized by transposition of the power line, transposition of the communication line.

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The steady state stability of the power system can be increased by connecting lines in parallel.

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The maximum load that a power transformer can carry is limited by its?

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The maximum load that a power transformer can carry is limited by its voltage ratio.

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Active power and apparent power are represented by?

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Active power and apparent power are represented by kW and kVA.

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How much electricity is produced by a power plant?

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Yes, we can make the power factor of synchronous motor leading by adjusting its excitation.

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An SSB transmitter produces a peak-to-peak voltage of 200 V across a 100 Ω antenna load. What is the Peak Envelope Power? A) 49.98 W B) 79.98 W C) 99.96 W D) 199.93 W

Answer :

An SSB transmitter produces a peak-to-peak voltage of 200 V across a 100 Ω antenna load. What is the Peak Envelope Power? A) 49.98 W B) 79.98 W C) 99.96 W D) 199.93 W

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What is the value of capacitance required to improve power factor from 0.7 to 0.9. Given that: Real power = 50 W Vrms of the source = 120 Frequency = 50 Hz   #powerfactor

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The basic requirements of locating wind power plant:  1) The site should be selected where winds are strong i.e. where pressure of wind is high and there is continuity. 2) Wind pressure ... the turbine which can affect the system's overall performance. 10)Possibility to connect to power grid. 

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What are the criteria for selection of site for hydroelectric power plant?

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Following Factors to be kept while site selecting for Hydro power plant:  1. It should be located where high rain fall occurs. 2. A large catchments area must be available to store water. 3. It ... 12. Cost of land should be less. 13. Skilled and unskilled man power should be available nearby.

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Options: A) WATT B) AMPERE C) VOLTS D) OHM

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Correct Answer: A) WATT

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