Voltage is the potential to do work , is the ratio of energy available to the charge expressed in volts.

**Description :** Limitation and application of High Voltage DC (HVDC)

**Last 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 ... conventional/non-conventional) 12) Increasing existing grid utilization. 13) Interconnection of different grids or networks

**Description :** State standard voltage in India for the following : (i) Generation Voltage (ii) Primary Transmission Voltage

**Last Answer :** i. Generation Voltage : 3.3KV, 6.6KV,11KV and 17.5 KV ii. Primary Transmission voltage :- 220 KV, 400KV, 765 KV (750 KV)

**Description :** What kills, current or voltage?

**Last 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

**Description :** Define: i) Knee voltage ii) Reverse saturation current

**Last 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. ... semiconductor diode caused by diffusion of minority carriers from the neutral regions to the depletion region.

**Description :** If 1-phase voltage is 220V, why is 3-phase 440V and not 660V ?

**Last 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 ... these event happen very fast. Hence we have 440 v only in three phase motor. √3.phase voltage= 380 v.

**Description :** Is the power line voltage available in our homes a dc or an ac voltage?

**Last 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.

**Description :** Self induced voltage across an inductance

**Last Answer :** Self induced voltage across an inductance

**Description :** Instantaneous value of a sine wave voltage

**Last Answer :** Instantaneous value of a sine wave voltage

**Description :** Why inductor current lags inductor voltage ?

**Last 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

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

**Last 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' ... upon position of armature. The nature of emf is alternating as shown by the waveform.

**Description :** Explain lagging quantity and leading quantity, explain this concept with voltage and current waveform

**Last 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 ... current is leading the voltage or the voltage is said to be lagging behind the current.

**Description :** Draw circuit diagram of voltage divider biasing list two advantages of voltage divider biasing of BJT.

**Last 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 ... 5. The resistor RE introduces a negative feedback. So all the advantages of negative feedback are obtained.

**Description :** Define pinch off voltage and drain resistance of FET.

**Last 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 ... drain to source voltage to the change in drain current. It is also called AC/dynamic drain resistance.

**Description :** Define Depletion region and Barrier voltage of PN junction.

**Last 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 ... charge formed at the p-n junction is called barrier voltage, barrier potential or junction barrier.

**Description :** State the concept of internal voltage drop.

**Last 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 ... internal voltage drop, the terminal voltage of practical voltage source is always less than its emf.

**Description :** Define : (i) Dielectric strength (ii) Breakdown voltage

**Last 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 is no longer an insulator) for a specified thickness, is its breakdown voltage.

**Description :** What is internal voltage drop and terminal voltage?

**Last 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) ... than the nominal voltage (emf) of the cell and this lower voltage is called terminal voltage.

**Description :** An independent voltage source in series with an impedance ZS=R+jXS delivers a maximum average power to a load impedance ZL when A) ZL = R B) ZL = jXS C) ZL = R-jXS D) ZL = R+jXS

**Last 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

**Description :** 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

**Last 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

**Description :** 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

**Last 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%

**Description :** The permissible voltage variation in transmission and distribution system is: (A) ± 0.1% (B) ± 1% (C) ±10% (D) ± 25%

**Last Answer :** The permissible voltage variation in transmission and distribution system is: ±10%

**Description :** Step-down transformer converts high voltage and low current into: (A) How voltage and high current (B) High voltage and low current (C) Low voltage and high current (D) None of the above

**Last Answer :** Step-down transformer converts high voltage and low current into: Low voltage and high current

**Description :** The kVA rating of Three-phase transformer with Voltage = 200V and Current = 100A will be : (A) 34.64 kVA (B) 75 kVA (C) 20 kVA (D) None of the above

**Last Answer :** The kVA rating of Three-phase transformer with Voltage = 200V and Current = 100A will be : 34.64 kVA

**Description :** 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

**Last 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

**Description :** 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 :

**Last 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

**Description :** A current controlled voltage source is equivalent to : (A) series voltage feed -back amplifier (B) shunt current feed -back amplifier (C) shunt voltage feed -back amplifier (D) series current feed -back amplifier

**Last Answer :** A current controlled voltage source is equivalent to : shunt voltage feed -back amplifier

**Description :** 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

**Last 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

**Description :** 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 ... in power systems to step down extra high voltage signals and provide low voltage D) None of these

**Last 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 ... power systems to step down extra high voltage signals and provide low voltage D) None of these

**Description :** 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

**Last 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

**Description :** 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

**Last 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

**Description :** A network that consists of at least a voltage source or current source is called A) Active network B) Ideal network C) Sourced network D) Outsourced network

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

**Description :** 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

**Last 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

**Description :** 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

**Last 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

**Description :** 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

**Last 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

**Description :** In a battery, the difference between the no-load voltage and the measured voltage output is called ________ A) Internal voltage B) Internal resistance C) External resistance D) All the above

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

**Description :** 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 (A) 28.2 mm (B) 26.4 mm (C) 24.4 mm (D) 22.0 mm

**Last 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

**Description :** 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 (A) + 120 V (B) – 120 V (C) – 60 V (D) + 60 V

**Last 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

**Description :** 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 (A) 300 W (B) 150 W (C) 45 W (D) 20 W

**Last 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

**Description :** 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?

**Last 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.

**Description :** what is the minimum voltage required to turn on a diode ?

**Last Answer :** 0.7 v sil and 0.3 v for gr

**Description :** Electrical shock happens for voltage/current?

**Last 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.

**Description :** If resistance is 8 Ohm and current is 16 ampere then what will be the voltage and power?

**Last Answer :** 128 volts ,2048 watts

**Last 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.

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

**Description :** what is ideal voltage source?

**Last Answer :** every voltage source have their own resistance that is called as internal resistance it is because of the resistance of electrodes and electrolytes in the battery interms of other supplyit have ... in universe it means ideal voltage source is this voltage source having internal resistance zero

**Description :** Why does surge impedance loading (SIL) increase with increase in voltage level?

**Last Answer :** Answer: SIL varies as the square of the operating voltage, so SIL increases with increase in voltage level

**Description :** Electro-mechanical voltage regulators are generally used in (a) reactors (b) generators (c) transformers (d) all of the above

**Last Answer :** (b) generators