Eee important questions

VERY IMPORTANT ELECTRICAL ENGINEERING OBJECTIVE TYPE QUESTIONS

1.The flow of electric current in a conductor is due to flow of
    a. electrons 
    b. protons
    c. electrons and ions
    d. charged particles.
ans: a.

2. An electric current is the
    a. random movement of electrons in a conductor
    b. movement of free electrons predominantly in one direction
    c. pressure difference between the poles
    d. the power that causes drift of electrons
ans: b.

3. In gases the flow of current is due to
    a. electrons only
    b. positive and negative ions
    c. electrons and positive ions
    d. electrons, positive ions and negative ions
ans: d.

4. The minimum requirement for causing flow of current are
    a. a voltage source, a resistor and a switch
    b. a voltage source and conductor
    c. a power source and bulb
    d. a voltage source, a conductor, an ammeter and a switch
ans: b.

5.The draft velocity of electrons is
    a. larger than speed of light
    b. almost equal to speed of light
    c. equal to speed or light
    d. very small in comparison to speed of light
ans: d.

6.The resistance of the filament of a bulb is higher than the cold resistance because the temperature  coefficient of the filament is
    a. Negative
    b. Infinite
    c. Zero
    d.  Positive
ans:d.

7. The temperature coefficient of resistance of an insulator is
    a. positive and independent of temperature
    b. negative and independent of temperature
    c. negative and dependent of temperature
    d. positive and dependent of temperature.
ans:c.

8. A network has 4 nodes and 3 independent loops. what is the number of branches in the network?
    a. 5
    b. 6
    c. 7
    d. 8.
ans:b.

9. If there are b branches and n nodes the number of equations will be
   a. n-1
   b. b
   c. b-n
   d. b-n+1
ans:d.

10. An electric circuit with 10 branches and 7 nodes will have
   a. 3 loop equations
   b. 4 loop equations
   c. 7 loop equations
   d. 10 loop equations
ans:b.

11. A network has 10 nodes and 17 branches. The number of different node pair voltage would be
    a. 7
    b. 9
    c. 45
    d. 10
ans:b.

12. If the number of branches in a network is B the number of nodes is N and the number of     dependent loops is L then the number of independent node equations will be
    a. N-L-1
    b. B-1
    c. B-N
    d. N-1
ans:d.

13. The graph of an electrical network has N nodes and B branches. The number of links L , with respect to the choice of tree, is  given by
    a. B-N+1
    b. B+N
    c. N-B+1
    d. N-2B-1.
ans:a.

14. The number of possible ordered trees with 3 nodes A,B,C is
    a. 6
    b. 8
    c. 10
    d. 12
ans:d.

15. What is the number of chords of a connected graph G of n vertices and e edges?
    a. n(n-1)
    b. n-1
    c. e-n-1
    d. e-n+1.
ans:d.

16. Ideal voltage source have
    a. zero internal resistance
    b. infinite internal resistance
    c. low value of current
    d. large value of emf
ans:a.

17. Ideal current source have
    a. zero internal resistance
    b. infinite internal resistance
    c. low value of voltage
    d. large value of current.
ans:b.

18. A parctical current source is represented by
    a. a resistance in series with an ideal current source
    b. a resistance in parallel with an ideal current source
    c. a resistance in parallel with an ideal voltage source
    d. none of the above
ans:b.

19. A dependent source
   a. may be a current source or a voltage source
   b. is always a voltage source
   c. is always a current source
   d. neither a current source nor a voltage source
ans:a.

20.To neglect a voltage source, the terminals across the source are
    a. open-circuited
    b. short-circuited
    c. replaced by some resistance
    d. replaced by inductor
ans:b.

21. Kirchoff's laws are valid for
    a. linear circuits only
    b. passive time invariant circuits
    c. non linear circuits only
    d. both linear and