DC Basic and Networks True & False
1. One ampere means the flow of one coulomb each second.
1.TRUE
2.1 coulomb charge is equal to 6.25 x 1018 electrons.
2.TRUE
3. The charge Q flow through a conductor carrying current of I amperes for 1 seconds is equal to 1/t coulombs.
3.FALSE
4. Voltage applied across a circuit, acts as a force.
4.TRUE
5. Volt is a form of potential energy.
5.TRUE
6. The ratio of voltage and electric current in a closed circuit remain constant.
6.TRUE
7. linear resistor is one which obeys Ampere's law.
7.FALSE
8. Specific resistance is measured in 2/m.
8.FALSE
9. The reciprocal of resistivity of a material is called its conductivity.
9.TRUE
10. The resistance of a conductor increases at its x-sectional area decreases.
10.TRUE
11. The voltage drop across each resistor is same in case of a series circuit.
11.FALSE
12. The heating effect of electric current is always desirable.
12.FALSE
13. 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.
13.FALSE
14. Resistance of a tungsten filament lamp decreases with the increase in supply voltage.
14.FALSE
15. If two lamps of 100 W and 40 W are connected in series across 230 V ac supply, 100 W lamp will glow brighter.
15.FALSE
16. 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.
16.FALSE
17. A capacitor is sort of open circuit to de.
17.TRUE
18. The current through a capacitor is zero if the voltage across it is not changing with time
18.TRUE
19. An ideal voltage source should have zero internal resistance.
19.TRUE
20. Any practical voltage source can be converted into a practical current source and vice versa.
20.TRUE
21. Constant voltage source is active and bilateral.
21.FALSE
22. Two ideal voltage sources of unequal output voltages cannot be placed in parallel
22.TRUE
23. Solution of an electric circuit will give the same result whether the source is treated as a voltage source or a current source.
23.TRUE
24. For a graph with n nodes, every Tree has (n- 1) branches.
24.TRUE
25. The response of a circuit is time-variant if given signal x(1) ande response y(t) when the signal is x(t-T) the response is y(t- T).
25.TRUE
26. Principle of homogeneity shows linear circuit.
26.TRUE
27. 27. 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.
27.FALSE
28. Superposition theorem is not applicable to a network containing time varying resistors.
28.TRUE
29. 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 determind.
29.TRUE
30. Norton's equivalent resistance is the same as Thevenin's equivalent resistance.
30.TRUE
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