Description : why ohm's law is not applicable for ac circuit?

**Answer** : We can use Ohm's law for AC circuit if circuit consists of linear components and devices.

Description : Does the linear circuit obey Ohm's law?

**Answer** : Yes linear circuit obey Ohm's law and nonlinear circuit not satisfied Ohm's law.

**Answer** : If the resistance of a conductor does not vary in accordance with Ohm's law it is known as non-linear conductor

Description : Can we apply the superposition theorem to AC circuit?

Description : According to Ohm's law: (1) The voltage is constant to current (2) The voltage is proportional to current (3) Voltage is inversely proportional to current (4) The voltage is proportional to resistance

**Answer** : At constant temperature current passing through a conductor is directly proporstional to voltage across a conductor

Description : Ohm’s law is applicable to : (A) Semi-conductors (B) Vacuum tubes (C) Electrolytes (D) Semiconductors and Vacuum tubes

Description : is Ohms law applicable to vacuum tubes?

**Answer** : Ohm's law is not applicable to vacuum tubes.

Description : To educate according to nature means Options: A) To return to the nature as opposed to the artificial in life B) To educate according to the law of nature of human development C) To study natural laws and apply them to the education process D) All of the above

**Answer** : D) All of the above

Description : Kirchhoff's current law is applicable to 1. Closed loops in a circuit 2. Junction in a circuit 3. Magnetic circuits Which of the above is/are correct ? (a) 1 only (b) 2 only (c) 3 only (d) 1, 2 and 3

**Answer** : Kirchhoff's current law is applicable to 1. Closed loops in a circuit 2. Junction in a circuit 3. Magnetic circuits Which of the above is/are correct ? (a) 1 only (b) 2 only (c) 3 only (d) 1, 2 and 3

Description : State Ohm’s law for electric circuit.

**Answer** : Ohms law -States that the current flows in a circuit is directly proportional to the applied voltage (V) and inversely the proportional resistance provided with the temperature main constant

Description : State and explain Ohm’s law.

**Answer** : Ans: Ohm's law: As long as physical conditions (such as dimensions, pressure and temperature) are constant, the potential difference or voltage applied across the conductor is directly proportional to ... V/R where, R = constant of proportionality, called as the resistance of the conductor.

Description : State different types of power in ac circuits. Write the expression and units for the same. Draw the power triangle.

**Answer** : i) Active Power (P):- The active power is defined as the average power Pavg taken by or consumed by the given circuit. ii) Reactive Power (Q):- The reactive power is defined as the product of ... values of voltage (v) and current (I) it is given by iv) Power Triangle:

Description : AC Circuits with Resistance but No Reactance

**Answer** : AC Circuits with Resistance but No Reactance AC Circuits with Resistance but No Reactance Series resistances let two resistances R 1 and R 2 are connected in series as shows in figure and there ... voltage. Voltage V A is common to both the branch hence voltage V A is common reference.

Description : What is the need of polarity marking in polyphase AC circuits?

**Answer** : Need of Polarity Marking in Polyphase AC Circuits: i) Polarity marking of terminals provides reference polarity for better understanding of system, even if the polarity of ac voltage changes ... of current transformers in relay protection circuit and getting desired performance is very difficult.

Description : Compare AC & DC track circuits on i) Length of circuit ii) Application iii) Effect of stray currents. iv) Maintenance

**Answer** : Ans: i) Length of circuit - a) AC track circuit is having long length upto 3 to 5 km b) DC track circuit is having short length ii)Application -a) AC track circuit is used ... ) Maintenance - a) AC track circuit has easier and cheaper maintenance b) DC track circuit has complicated maintenance

Description : The instantaneous power in ac circuits can be obtained by taking product of the instantaneous values of

**Answer** : The instantaneous power in ac circuits can be obtained by taking product of the instantaneous values of current and voltage

Description : Which of the following statements does NOT apply to arteries when comparing them to veins: a) have thick walls b) carry blood away from heart c) highly elastic walls d) have valves.

**Answer** : ANSWER: D -- HAVE VALVES

Description : The magnitude of current flowing between two end points of a conductor is proportional to the potential difference between them and is called as: (1) Avogadro’s law (2) Rault’s law (3) Ohms law (4) Faraday’s law

**Answer** : Ohms law

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

Description : About trnsformer

**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

Description : Kirchhoff's voltage law applies to circuits with?

**Answer** : Kirchhoff's voltage law applies to circuits with linear, non-linear, active, passive, time varying as wells as time-in-variant elements.

Description : Kirchhoff s law is not applicable to circuits with?

**Answer** : Kirchhoff's law is not applicable to circuits with distributed parameters.

Description : Which one of the following laws best describes the operation of an electric generator? w) Ampere's Law x) Gauss' Law y) Ohm's Law for Conductors z) Faraday's Law of Induction

**Answer** : ANSWER: Z -- FARADAY'S LAW OF INDUCTION

Description : What law describes the force between two stationary electrically charged objects? w) Ampere's law x) Coulomb's law y) Kirchoff's Rules (pron: kir-koff rules) z) Ohm's law

**Answer** : ANSWER: X -- COULOMB'S LAW

Description : Induced electric currents can be explained using which of the following laws? w) Gauss's Law x) Faraday's Law y) Ohm's Law z) Ampere's Law

**Answer** : ANSWER: X -- FARADAY'S LAW

Description : The force acting between two point charges can be computed using which of the following laws? w) Ohm's Law x) Ampere's Law y) Coulomb's Law z) Newton's Second Law.

**Answer** : ANSWER: Y -- COULOMB'S LAW

Description : Define charging, discharging, specific resistance and Ohm’s law.

**Answer** : Charging:- It is the operation of the cell in which external source of current reverses the electrochemical cell reaction in order to restore the battery to its original fully charged state. ... across the conductor & inversely proportional to the resistance (R) of a conductor.

Description : Ohm’s law is valid in case of (1) semiconductor (2) conductor (3) superconductor (4) insulator

**Answer** : conductor

Description : State and explain Ohm's law for magnetic circuit.

**Answer** : Ohm's law for electric circuit is V = I R where V is voltage, I is current, R is Resistance. Ohm's law for magnetic circuit is MMF = Φ X S where MMF is magnetomotive force (NI) ... . Resistance is the opposition to the flow of current while reluctance is the opposition to the flow of magnetic flux.

Description : The condition for the validity under Ohm's law is that?

**Answer** : The condition for the validity under Ohm's law is that resistance must be uniform.

Description : In AC circuits, AC meters measure (1) mean values (2) rms values (3) peak values (4) mean square values

**Answer** : rms values

Description : Which of the following instruments is equally accurate on ac as well as dc circuits ? (a) PMMC voltmeter (b) Dynamometer wattmeter (c) Moving iron ammeter (d) Induction wattmeter

Description : Wagner's earth devices are used in AC bridge circuits for (a) Eliminating the effect of earth capacitances (b) Eliminating the effect of intercomponent capacitances (c) Eliminating the effect of stray electrostatic fields (d) Shielding the bridge elements

**Answer** : Wagner's earth devices are used in AC bridge circuits for Eliminating the effect of earth capacitances

**Answer** : Kirchhoff's current law for parallel circuits states that the: sum of the total currents flowing out of a junction equals the sum of the total currents flowing into that junction.

Description : Why does a transformer only work with an AC supply?

**Answer** : The transformer work depends on the induction as main principle ,for that AC is the right means

Description : All the rules and laws of D.C. circuit also apply to A.C. circuit containing?

**Answer** : All the rules and laws of D.C. circuit also apply to A.C. circuit containing resistance only.

Description : What is the “rule of law”? Choose one: a. Everyone but the President must follow the law. b. Government does not have to follow the law. c. All laws must be the same in every state. d. Everyone must follow the law.

**Answer** : Correct Answer: d. Everyone must follow the law.

Description : The Psychological law of consumption states that (1) proportionate increase in consumption is less than proportionate increase in income (2) increase in income is equal to increase in consumption (3) ... is greater than increase in income (4) consumption does not change with a change in income

**Answer** : proportionate increase in consumption is less than proportionate increase in income

**Answer** : IT CHANGES NEGATIVE CYCLE IN TO POSITIVE CYCLE FROM AC CURRENT.

Description : What does the judicial branch do? Choose one: a. Decides if a law goes against the Constitution. b. Reviews laws. c. Resolves disputes. d. All of the above.

**Answer** : Correct Answer: d. All of the above

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