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What is a switching impulse?

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Description : What is impulse voltage of transformer?

Description : What is the impulse response of the system?

Description : What is mean by power switching devices?

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

Description : 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:

Description : 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.

Description : Explain series switching control of AC load. Single phase resistance load - Integral half cycle control Phase control - Resistance load

Description : Explain switching model of MOSFET.

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

Description : 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.

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

Answer : 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).

Description : A standard switching impulse has: a. A time to peak T p of 250 µs and a time to half-value T2 of 2500 µs b. A time to peak T p of 1.2 µs and a time to half-value T2 of 50 µs c. A time to peak T p of 0.25 ... half-value T2 of 2.5 s d. A time to peak T p of 0.12 s and a time to half-value T2 of 0.5 s 

Answer : A standard switching impulse has: a. A time to peak T p of 250 µs and a time to half-value T2 of 2500 µs b. A time to peak T p of 1.2 µs and a time to half-value T2 of 50 µs c. A time to peak T p of 0.25 ... -value T2 of 2.5 s d. A time to peak T p of 0.12 s and a time to half-value T2 of 0.5 s 

Description : A baseball bat strikes a ball with a force of 30 newtons. If the ball was in contact with the bat for 1/10 of a second, what impulse did the ball receive?

Answer : ANSWER: 3 NEWTON-SECONDS

Description : A 2 kilogram mass accelerates at 5 meters per second squared for 3 seconds. What impulse has acted on the mass? 

Answer : ANSWER: 30 NEWTON-SECONDS or 30 KILOGRAM-METERS PER SECOND 

Description : What are the losses in a transmission line?

Description : What is meant by flash over voltage?

Description : What is dielectric breakdown strength?

Description : What is the difference between line and phase current?

Answer : The currents flows through phase lines is called line voltage and currents flows from phase to neutral line is called phase current

Description : What is the lowest acceptable insulation resistance for a cable?

Description : What is the purpose of using a Megger?

Description : What is dielectric withstand voltage?

Description : What do you mean by insulation coordination?

Description : What does BIL stand for in electrical terms?

Answer : BIL stands for Basic Insulation Level.

Description : What is a safe distance from power lines?

Description : What is the definition of extra low voltage?

Answer : Extra-low voltage (ELV) is an electricity supply voltage in a range which carries a low risk of dangerous electrical shock.

Description : What is the difference between line and phase voltage?

Answer : Line voltage  is  voltage  between two  phases R &Y  (415 v)  while  phase  voltage  is  the  voltage  between  one  phase and  a neutral  B &  N   (240 v).

Description : What is a Ductor tester used for?

Description : What is an insulation resistance test?

Description : What is double or reinforced insulation?

Description : What is Extra High Voltage?

Description : What is the difference between a line voltage and low voltage control system?

Description : What is basic insulation level?

Description : What are the advantages of high voltage transmission?

Answer : Advantages:  1. As Transmission voltage increases, current decreases. 2. As current decreases, cross section of conductor decreases. 3. As cross section of conductor decreases ... line increases  12. As transmission voltage increases power handling capacity of transmission line increases 

Description : What is a high voltage test?

Description : What is considered low voltage and high voltage?

Description : What is the use of lightning arrester?

Answer : The lighting arrester is used to discharge the high voltage surge towards the earth by the lighting strike

Description : Of the following terms, which is the product of force and time? Is it: w) impulse x) power y) energy z) work

Answer : ANSWER: W -- IMPULSE

Description : An impulse of 10 kilogram-meter per second acting on an object whose mass is 5 kilogram will cause a change in the objects velocity of: w) 0.5 meters per second x) 2 meters per second y) 10 meters per second z) 50 meters per second

Answer : ANSWER: X -- 2 METERS PER SECOND

Description : Comment on Mach number of steam in impulse and reaction turbines. 

Answer : Mach number, in fluid mechanics, ratio of the velocity of a fluid to the velocity of sound in that fluid. Mach numbers less than one indicate subsonic flow; those greater than one, supersonic flow.

Description : "Great things are not done by impulse, but by a series of small things brought together." - Vincent van Gogh 

Description : Which of the following statements concerning learning is the least acceptable? Options: A) Learning involves the acquisition of habits, knowledge and attitudes B) Learning involves new ways of ... resistance to the passage of a neutral impulse D) Learning represents progressive change in behaviour 

Answer : D) Learning represents progressive change in behaviour 

Description : “Sodium Pump” operates in (1) Muscle contraction (2) Heart beat (3) Nerve impulse (4) None of the above

Answer : Nerve impulse

Description : While catching a ball, a player pulls down his hands to lower the– (1) force (2) momentum (3) impulse (4) catching time

Answer : momentum

Description : The dimension of which of the following is the same as that of impulse ? (1) Volume (2) Momentum (3) Torque (4) Change in the rate of momentum

Answer : Momentum

Description : Explain principle of working of Impulse steam turbine with neat sketch.

Answer : Construction: Impulse turbine is simpler, less expensive and does not need to be pressure proof. It can operate with any pressure stream but is considerably less efficient. Impulse turbine consist of one ... by one set of moving blade ring as shown in Fig. for a single stage impulse turbine.

Description : Difference between Impulse turbine and Reaction turbine.

Answer : Impulse turbine Reaction turbine 1. Steam completely expands in nozzle and pressure remains constant during flow through the blade passage.2. Relative velocity of steam passing over blade of impulse ... more space per unit power. 6.The blades are aerofoil & non symmetrical type.

Description : IMPULSE TURBINE

Answer : IMPULSE TURBINE: Schematic of impulse steam turbine is shown in Fig. It has single-stage having a nozzle fitted in the casing followed by ring of moving blades mounted on the shaft. Variation of ... losing the velocity and thus causing rotation of moving blade ring mounted on shaft

Description :  Impulse testing of transformers is done to determine the ability of: A) bushings to withstand vibrations B) insulation to withstand transient voltages C) windings to withstand voltage fluctuations D) all of the above

Answer :  Impulse testing of transformers is done to determine the ability of: insulation to withstand transient voltages

Description : On different unit impulse function results in   (A) Unit parabolic function (B) Unit triplet (C) Unit doublet (D) Unit ramp function

Answer : On different unit impulse function results in Unit doublet

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