176 views

**Description :** What will happen if you increase the current in the motor?

**Last Answer :** Increasing current means increasing frequency of the motor because current is directly proportional to rotations of the motor rotor

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**Description :** How can we increase the induced current?

**Last Answer :** Induced current can be increased by reducing no of windings on the secondary part compared to primary.

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**Description :** For given applied voltage, with the increase in frequency of the applied voltage?

**Last Answer :** For given applied voltage, with the increase in frequency of the applied voltage eddy current loss will remain unchanged.

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**Description :** Why does the speed of a DC shunt motor decrease as the load increases?

**Last Answer :** Because if the load is increasing then the torque must also be increase. If not then the speed of motor will decrease.

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**Description :** Analyze the effect of supply voltage on performance of LED as regards current, Lumen output, efficacy and life.

**Last Answer :** 1) Effect on Current:- In LED current depends upon supply voltage, if voltage get changes then current also change but this change in current will be control by resistors which are connected in series. 2) ... 4) Effect on Life:- If supply voltage is not stable then life of LED get reduced.

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**Description :** With the help of N-channel JFET describe the effect of input voltage VGS on output current ID.

**Last Answer :** Working of N channel FET: * When a voltage is applied between the drain and source with a DC supply (VDD), the electrons flows from source to drain through narrow channel ... where the channel gets completely blocked and the drain current becomes zero is called pinch- off voltage.

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**Description :** Define: i) Input Offset Voltage ii) Input offset Current iii) Input Bias Current iv) Output offset voltage

**Last Answer :** Definition of parameters of OPAMP is follows: i) Input Offset Voltage: Input offset voltage is defined as the voltage that must be applied between the two input terminals of an OPAMP to null or ... to ground) and output voltage is obtained non zero such voltage is output offset voltage of opamp.

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**Description :** A linear network has a current input 4cos(ω t + 20º)A and a voltage output 10 cos(ωt +110º) V. Determine the associated impedance.

**Last Answer :** Solution

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**Description :** Source transformation voltage source to current source and vice versa

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**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

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**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

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**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.

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**Description :** Define: 1) voltage ratio, 2) current ratio, 3) transformation ratio of transformer.

**Last Answer :** 1) Voltage ratio: The voltages in primary and secondary winding is proportional to number of turns in primary and secondary respectively. So, the voltage ratio is same as transformation ratio. V2/V1 = N2 ... as transformation ratio of transformer. It is denoted by K. K = N2/N1

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**Description :** Write the relation between phase and line current, phase and line voltage for Star connection.

**Last Answer :** Line voltage is equal to root three times of phase voltage and line and phase currents are equal in star connection

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**Description :** A zener voltage regulator has load requirements of 12 V and 2 A. The zener diode minimum current requirement is 0.2 A. The minimum voltage at input is 24 V. What is the required value of series resistance with source? A) 5.45 Ω B) 6 Ω C) 7.2 Ω D) 6.38 Ω

**Last Answer :** A zener voltage regulator has load requirements of 12 V and 2 A. The zener diode minimum current requirement is 0.2 A. The minimum voltage at input is 24 V. What is the required value of series resistance with source? A) 5.45 Ω B) 6 Ω C) 7.2 Ω D) 6.38 Ω

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**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

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**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

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**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

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**Description :** Which of the following theorems enables a number of voltage (or current) source to be combined directly into a single voltage (or current) source. (1) compensation theorem (2) reciprocity theorem (3) superposition theorem (4) Millman's theorem

**Last Answer :** Which of the following theorems enables a number of voltage (or current) source to be combined directly into a single voltage (or current) source. (1) compensation theorem (2) reciprocity theorem (3) superposition theorem (4) Millman's theorem

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**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

191 views

**Description :** The internal resistances of an ideal current source, and an ideal voltage source are, respectively, (A) 0, ∞ (B) ∞, ∞ (C) ∞, 0 (D) 0,0

**Last Answer :** The internal resistances of an ideal current source, and an ideal voltage source are, respectively, ∞, 0

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**Description :** A network is said to be under resonance when the voltage and the current at the network input terminals are (A) in phase (B) out of phase (C) in phase quadrature (D) in phase, and have equal magnitudes

**Last Answer :** A network is said to be under resonance when the voltage and the current at the network input terminals are in phase

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**Last Answer :** In order that current should flow without causing excessive heating or voltage drop, the relay contacts should have low contact resistance, be clean and smooth, be of sufficient size and proper shape.

124 views

according to ohms law voltage directly proportional to current but it is reverse in transformer why?

**Description :** About trnsformer

**Last Answer :** Acc to Ohms law V=IR but it is only applicable when our resistance R is constant, as in case of transformer we take impedence which is equivalent to resistance is not constant it varies with system parameters that why Ohms law not applicable in case of transformer

83 views

**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.

937 views

**Description :** When a voltage of one volt is applied, a circuit allows one micro ampere current to flow through it. The conductance of the circuit is?

**Last Answer :** If v = 1 volt and i = 1 micro amp, i= 10^(-6) So R = V/I, R= 1/10^(-6) , R= 10^6 And now Conductance G = 1/R So G = 10^(-6) mho..... Answer

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**Description :** Refer to the circuit below. The total absorbed (consumed) power is:

93 views

**Description :** Draw the Delta connected three phase system showing all the voltages and currents. Write the power equation.

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

**Last 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).

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**Description :** How to Increase Gas Mileage

**Last Answer :** How to Increase Gas Mileage Gasoline is a top priority in the budget of any car owner. You'll be surprised at how much you spend on gasoline in between refills, especially if you drive every day. With ... , but also save big money on trips to the fuel pump and refills for your car's fuel tank.

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**Description :** How to Increase Fiber in Your Diet ?

**Last Answer :** How to Increase Fiber in Your Diet Increasing fiber in your diet has many health benefits. Fiber is shown to lower cholesterol levels, lower the chances of getting type 2 diabetes, decrease the possibility ... of eight to ten glasses of water daily. The water helps your body digest the fiber faster.

200 views

**Last Answer :** The size of a synchronous motor decreases with the increase in flux density.

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**Description :** Reduction in core losses and increase in permeability are obtained with transformer employing?

**Last Answer :** Reduction in core losses and increase in permeability are obtained with transformer employing core built-up of laminations of cold rolled grain oriented steel.

77 views

**Description :** What are three ways you can increase the strength of an electromagnet?

134 views

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

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

141 views

**Description :** 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

**Last Answer :** In voltage source converter based HVDC transmission system the active power is controlled by changing phase angle of the converter ac input voltage

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**Description :** Why high voltage can reduce power loss?

**Last Answer :** when voltage has increased due to reduced current flow, thus power loss given by ( I^2R) will be low due to reduced current(I^2) provided that resistance (R) is constant.

136 views

**Description :** What is the definition of extra low voltage?

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

217 views

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

**Last 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).

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**Description :** Why high voltage is used in power transmission?

**Last Answer :** The primary reason that power is transmitted at high voltages is to increase efficiency. ... The lower current that accompanies high voltage transmissionreduces resistance in the conductors aselectricity flows ... This means that thin, light-weight wires can beused in long-distance transmission.

120 views

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

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**Description :** What are the advantages of high voltage transmission?

**Last 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

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