Network Theory | True-False Questions | Electricalvoice

Network Theory | True-False Questions

Q. One ampere means the flow of one coulomb each second.

Answer
True

Q. Ampere-second could be the unit of charge.

Answer
True

Q. 1 coulomb charge is equal to 6.25 x 1018 electrons.

Answer
True

Q. The charge Q flow through a conductor carrying current of I amperes for t seconds is equal to I/t coulombs.

Answer
False

Q. Voltage applied across a circuit, acts as a force.

Answer
True

Q. Volt is a form of potential energy.

Answer
True

Q. The ratio of voltage and electric current in a closed circuit remain constant.

Answer
True

Q. A linear resistor is one which obeys Ampere’s law.

Answer
False

Q. The lower the resistivity, greater the resistance.

Answer
False

Q. Specific resistance is measured in Ω/m3

Answer
False

Q. The reciprocal of resistivity of a material is called its conductivity.

Answer
True

Q. The resistance of wires varies inversely as length.

Answer
False

Q. The resistance of a conductor increases at its cross-sectional area decreases.

Answer
True

Q. The substances having a large number of free electrons and offering low resistance are called the insulators.

Answer
False

Q. With the rise in temperature the insulating property of an insulator gains.

Answer
False

Q. The specific resistance of copper increases with the increase in temperature.

Answer
True

Q. The values of temperature coefficient of resistance of a given conductor are the same at different temperatures.

Answer
False

Q. Power rating of a resistor largely depends on the physical size of the resistor.

Answer
True

Q. The voltage drop across each resistor is same in case of a series circuit.

Answer
False

Q. The heating effect of electric current is always desirable.

Answer
False

Q. Two heater coils of same material are connected in parallel across the supply. Coil A has diameter and length double that of coil B. Coil B will produce more heat.

Answer
False

Q. Resistance of a tungsten filament lamp decreases with the increase in supply voltage.

Answer
False

Q. If two lamps of 100 W and 40 W are connected in series across 230 V ac supply, 100 W lamp will glow brighter.

Answer
False

Q. When a resistance element of a heater gets fused, we remove a portion of it and reconnect it to the same supply. The power drawn by the heater will decrease.

Answer
False

Q. An ideal voltage source should have zero internal resistance

Answer
True

Q. Any practical voltage source can be converted into a practical current source and vice versa.

Answer
True

Q. Constant voltage source is active and bilateral.

Answer
False

Q. Two ideal voltage sources of unequal output voltages cannot be placed in parallel.

Answer
True

Q. A resistance is connected to a practical source. The current through this resistance can be determined only by representing the source as a current source.

Answer
False

Q. Solution of an electric circuit will give the same result whether the source is treated as a voltage source or a current source.

Answer
True

Q. In a practical voltage source, the source impedance is very large in comparison to load resistance.

Answer
False

Q. For a graph with n nodes, every Tree has (n – 1) branches.

Answer
True

Q. The response of a circuit is time-variant if given signal x(t) and response y(t) when the signal is x(t – T) the response is y(t-T).

Answer
True

Q. The number of possible ordered trees with three nodes ABC is 6.

Answer
False

Q. A network has 4 nodes and 3 independent loops. The number of branches in the network will be 5.

Answer
False

Q. Principle of homogeneity shows linear circuit.

Answer
True

Q. According to Kirchhoff s voltage law, at any junction of an electrical network, the sum of incoming currents is equal to sum of outgoing Currents.

Answer
False

Q. Superposition theorem is not applicable to a network containing time varying resistors.

Answer
True

Q. Thevenin’s theorem is quite useful when the current in one branch of a network is to be determined or when the current in an added branch is to be determined.

Answer
True

Q. There is no relation between Thevenin’s theorem and Norton’s theorem.

Answer
False

Q. Norton’s equivalent resistance is the same as Thevenin’s equivalent resistance.

Answer
True

Q. The load is connected in parallel to the Norton’s equivalent resistance and Norton’s equivalent current source.

Answer
True

Q. Maximum power transfer theorem is particularly useful for analysing communication networks.

Answer
True

Q. For maximum transfer of power, internal resistance of the source should be equal to the resistance of the load.

Answer
False

Q. In reciprocity theorem voltage and current remain same in all parts of the networks.

Answer
False

Q. Tellegen’s theorem is applicable to both linear and nonlinear networks.

Answer
True

Q. Millman’s theorem yields equivalent voltage or current source.

Answer
True

Q. Three equal resistances are connected in star. If this star is converted into equivalent delta, the resistances of both the networks will be equal.

Answer
False

Q. A reciprocal two-port network is symmetrical of z11 = z22.

Answer
False

Q. A, B, C and D represent the transmission parameters of a two-port network. The network will be reciprocal if AD – BC = 0.

Answer
False
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