What is terminal voltage ?

Limitation and application of High Voltage DC (HVDC) Answer : Limitation and application of High Voltage DC (HVDC) : Limitation:- 1) It is difficult to step up and step down DC voltage like AC voltage. 2) Special cooling arrangements are necessary for converter, so it increases cost of substation. 3) Cost of DC substation is more than AC substation, due...

State standard voltage in India for the following : (i) Generation Voltage (ii) Primary Transmission Answer : i. Generation Voltage : 3.3KV, 6.6KV,11KV and 17.5 KV ii. Primary Transmission voltage :- 220 KV, 400KV, 765 KV (750 KV) ...

What kills, current or voltage? Answer : Current would kill. You can actually have thousands of bolts going through you and not even know it. Yes you probably know already voltage is current times resistance. Since your body is a resistor it would take just a small amount of current to create a very high voltage...

Define: i) Knee voltage ii) Reverse saturation current Answer : i) Knee voltage : The applied forward voltage, at which the PN junction starts conducting and current starts increasing exponentially is called knee voltage. It is 0.7V for Si and 0.3 for Ge diode. ii) Reverse saturation current The current produced due to minority carriers generated by th...

If 1-phase voltage is 220V, why is 3-phase 440V and not 660V ? Answer : Phase voltage =220v /( phase to neutral) Line voltage = 380 v ( phase to phase) Phase angle difference 120° So when two phases reach vmax +ve I.e. (+220v) + (+220v) = 440v that time due to phase angle difference one phase has reached -ve 220v and when two phases reached vmax-ve i.e. (-220v) + (-2...

Is the power line voltage available in our homes a dc or an ac voltage? Answer : The power line voltage available in our homes is AC. Mobile dwellings are the most commonly DC-supplied homes and even then they tend to include AC supply for heavier loads....

Voltage ratio Answer : Voltage ratio ...

Voltage divider rule Answer : Voltage divider rule ...

Voltage formula Answer : Voltage formula ...

Self induced voltage across an inductance Answer : Self induced voltage across an inductance ...

Kirchhoff's Voltage Law Answer : Kirchhoff's voltage law ...

Instantaneous value of a sine wave voltage Answer : Instantaneous value of a sine wave voltage ...

Faraday's law of induced voltage Answer : Faraday's law of induced voltage ...

Why inductor current lags inductor voltage ? Answer : Inductor is a wire wounding structure having a core material it induces emf which is opposite to the voltage supply and proportional to rate of change of current so current lags the voltage in inductor...

Explain how sinusoidal AC voltage is generated by using simple one loop generator. Answer : 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’s Law of electromagnetic induction). Thus, for generation of emf relative motion between magn...

Explain lagging quantity and leading quantity, explain this concept with voltage and current wavefor Answer : When two alternating quantities attain their respective zero or peak values simultaneously, the quantities are said to be in-phase quantities. When the quantities do not attain their respective zero or peak values simultaneously, then the quantities are said to be ou-of-phase quantities. The qu...

Draw circuit diagram of voltage divider biasing list two advantages of voltage divider biasing of BJ Answer : Two advantages of voltage divider biasing of BJT. 1. It is very simple method of transistor biasing. 2. The biasing conditions can be very easily set. 3. there is no loading of source 4. It provides better bias stabilization. 5. The resistor RE introduces a negative feedback. So all the advanta...

Define pinch off voltage and drain resistance of FET. Answer : 1 . Pinch-off Voltage: It is the value of the drain to source voltage VDS at which the drain current ID reaches its constant saturation value. Any further increase in VDS does not have any effect on the value of ID. It is denoted by VP. 2. Drain resistance : It is change in drain to source ...

Define Depletion region and Barrier voltage of PN junction. Answer : 1. Depletion region : The region consisting of immobile positive charge at n-side and immobile negative charge at p-side near the junction acts like a barrier and prevents the further flow of free electrons and holes. 2. Barrier voltage : The negative charge formed at the p-side of the p-n junct...

State the concept of internal voltage drop. Answer : Concept of internal voltage drop: Every practical source offers some opposition to the current due to its internal parts or components. e.g. a 12V battery has electrodes made up of conducting material having finite low resistance. Such a resistance of internal parts of source is called ‘Internal res...

Define : (i) Dielectric strength (ii) Breakdown voltage Answer : (i) Dielectric strength: The voltage which a dielectric material can withstand without breaking down (without losing its dielectric property) is called its dielectric strength. It is represented by kV/mm or kV/cm. e.g. dielectric strength of air is @ 30 kV/cm or 3 kV/mm. (ii) Breakdown Voltag...

What is internal voltage drop and terminal voltage? Answer : It is not permissible to just connect the positive terminal to the negative terminal of a cell with a copper wire. It will overheat and get damaged. This happens because the electromotive force (emf) drives a large current through the cell because of the small resistance of the materials that make ...

An independent voltage source in series with an impedance ZS=R+jXS delivers a maximum average power 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 ...

Which of the following connection of transformers will give highest value of secondary voltage ? (A Answer : Which of the following connection of transformers will give highest value of secondary voltage ? (A) Delta primary delta secondary (B) Delta primary star secondary (C) Star primary star secondary (D) Star primary delta secondary ...

Two transformers A and B having equal outputs and voltage ratios but unequal percentage impedances o Answer : Two transformers A and B having equal outputs and voltage ratios but unequal percentage impedances of 4 and 2 are operating in parallel. The transformer A will be overloaded by 33% ...

The permissible voltage variation in transmission and distribution system is: (A) ± 0.1% (B) ± 1% Answer : The permissible voltage variation in transmission and distribution system is: ±10% ...

Step-down transformer converts high voltage and low current into: (A) How voltage and high current Answer : Step-down transformer converts high voltage and low current into: Low voltage and high current ...

The kVA rating of Three-phase transformer with Voltage = 200V and Current = 100A will be : (A) 34. Answer : The kVA rating of Three-phase transformer with Voltage = 200V and Current = 100A will be : 34.64 kVA ...

Which of the following is the least expensive protection for over current in low voltage system? ( Answer : Which of the following is the least expensive protection for over current in low voltage system? (A) Rewireable fuse (B) Isolator (C) Oil Circuit breaker (D) Air break circuit breaker ...

A 3-phase voltage source inverter operates in 180° conduction mode with a star connected resistive l Answer : A 3-phase voltage source inverter operates in 180° conduction mode with a star connected resistive load. If input dc voltage is 100 V, then the peak to peak output line voltage is : 200 V ...

A current controlled voltage source is equivalent to : (A) series voltage feed -back amplifier (B) Answer : A current controlled voltage source is equivalent to : shunt voltage feed -back amplifier ...

In which of the following waveforms is RMS voltage equal to the average voltage? A) Triangle wave B Answer : In which of the following waveforms is RMS voltage equal to the average voltage? A) Triangle wave B) Square wave C) Sine wave D) None of these ...

What is a capacitor voltage transformer? A) It is a transformer used in power systems to step up lo Answer : What is a capacitor voltage transformer? A) It is a transformer used in power systems to step up low voltage signals and provide extra high voltage B) It is a transformer used in power systems to step up high voltage signals and provide extra high voltage C) It is a transformer used in power ...

What happens to the voltage in the secondary when the frequency of the supply in the primary is decr Answer : What happens to the voltage in the secondary when the frequency of the supply in the primary is decreased? A) It increases B) It decreases C) It remains the same D) Cannot say unless the actual percentage increase in the frequency is known ...

Which of the following cells produces a highly stable voltage? A) Weston cell B) Leclanche cell C) Answer : Which of the following cells produces a highly stable voltage? A) Weston cell B) Leclanche cell C) Both A and B D) None of these ...

A network that consists of at least a voltage source or current source is called A) Active network Answer : A network that consists of at least a voltage source or current source is called Active network ...

Consider a circuit with four resistors in series connected to a voltage source. What happens to the Answer : Consider a circuit with four resistors in series connected to a voltage source. What happens to the voltage across each resistor, if the value of each of the resistors is doubled? A) It will double B) It will remain the same C) It will be halved D) It will become zero ...

What is the RMS voltage in a series RL circuit, if the voltage across R and L is 256 V and 192 V res Answer : What is the RMS voltage in a series RL circuit, if the voltage across R and L is 256 V and 192 V respectively? A) 320 V B) 448 V C) 64 V D) None of these ...

A circuit that binds the upper or lower extreme of a waveform to a fixed DC voltage level is called Answer : A circuit that binds the upper or lower extreme of a waveform to a fixed DC voltage level is called ______ A) DC voltage restorer B) Clamping circuit C) Both A and B D) None of these ...

In a battery, the difference between the no-load voltage and the measured voltage output is called _ Answer : In a battery, the difference between the no-load voltage and the measured voltage output is called Internal resistance ...

A single core cable is designed to work for a single phase system with a peak voltage of 220 kV. The Answer : A single core cable is designed to work for a single phase system with a peak voltage of 220 kV. The maximum permissible stress in the dielectric is not to exceed 20 kV/mm. For economical size, the overall core diameter of the cable is 22.0 mm ...

At a particular instant, the R-phase voltage of a balanced 3-phase system is + 30 V, and the Y-phase Answer : At a particular instant, the R-phase voltage of a balanced 3-phase system is + 30 V, and the Y-phase voltage is – 90 V. The voltage of B-phase at that instant is + 60 V ...

A d.c. source has an open circuit voltage of 30 V and an internal resistance of 1.5 Ohm. A resistive Answer : A d.c. source has an open circuit voltage of 30 V and an internal resistance of 1.5 Ohm. A resistive load is connected to the source. Maximum power dissipated in the load is 150 W ...

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

what is the minimum voltage required to turn on a diode ? Answer : 0.7 v sil and 0.3 v for gr ...

Electrical shock happens for voltage/current? Answer : The severity ofelectric shockdepends on thecurrentflowing through the body, which is a function of the electromotive force (E) involts, and the contact resistance (R) in ohms....

If resistance is 8 Ohm and current is 16 ampere then what will be the voltage and power? Answer : 128 volts ,2048 watts...

Answer : yes High Voltage side of Transformer winding have more number of turns. and low voltage side of Transformer winding have less number of turns....

Answer : Unit of voltage is volt denoted by capital V ....

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