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Thursday, January 14, 2016

Basic Electricity Quiz 1


1. Resistance of a material not depending on
    ength
    ross-section
    ensity
    one of these

2. The resistance between the opposite faces of a meter cube of a material is called
    esistivity  
    Temperature coefficient
    Conductance
    one of these



3. Which of the following is not a characteristic of a parallel circuit?
    Branch currents are additive
    owers are additive
    onductances are additive
    oltages are additive




4. Voltage across a short circuit will be
    nfinity
    ero
    ity
    one of these

   

5. Two resistors of 10 ohm each are connected in series across a 10 V supply. What will be voltage across each resistors
    
    
    
    

   

6. Which of the following material has nearly zero temperature coefficient
    Carbon
    Copper
    Manganin
    Aluminiun

   

7. Which of the following statement is true both for a series and parallel dc circuit?
    Branch currents are additive
    owers are additive
    onductances are additive
    oltages are additive

   

8. A coil has a resistance of 100 ohm at 900C and at 1000C resistance is 101 ohm. The temperature coefficient of the wire at 900C is
     0.01
    0.1
    0.0001
    0.001

  

9. You have to replace a 1500-ohm in a circuit. But have no 1500-ohm resistor but have several 1000 ohms, which you would connect?
    Three in parallel
    hree in series
    wo in parallel
    wo in parallel and one series



10. Two wires A and B have same cross-section made of same material. Ra = 600 ohm, Rb = 100 ohm. The number of times A is longer than B is
    
    
    
    



11. Three 10 ohm resistors are connected in delta. If this is transformed to a star what will be the resistance of each branch?
    10 Ohm
    10/2 Ohm
    10/3 Ohm
    30 Ohm

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12. Kirchhoff’s current law is applicable to only     Closed loops in network
    Junctions in a network
    Electronic circuits
    Electric circuits



13. KVL is concerned with
    IR drops
    Battery emf
    unction volt
    oth A & B



14. The algebraic sign of an IR drop is primarily dependent on the
    Amount of current flowing through it
    Value of R
    Direction of flow of current
    Battery connection



15. The following formula is used to calculate the total resistance R of a parallel circuit?
    R=R1*R2*…Rn/(R1+R2+…Rn)
    R=1/R1+1/R2+…1/Rn
    1/R=1/R1+1/R2+…1/Rn
    R=R1+R2+….Rn



16. What is the formula for Ohm’s law?
    V=I+R
    I=V*R
    V=I/R
    I=V/R

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17.The resistance of a wire will double if we double the
    rea
    emperature
    ength
    eight



18. A voltage of 100 V is applied to a circuit of resistance of 10 ohms, the power the dissipated by the resistance will be
    100 Watts
    500  Watts
    1000 Watts
    1500 Watts

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19. Power taken by a resistance of 20 ohms with a flow of 10 A current is
    1kW
    1.5kW
    2.5kW
    2kW



20. When the high resistance is connected in parallel with a low resistance, the combined resistance is
    igher than the lower resistance
    ower than the higher resistance
    etween the value of high and low resistance
    ess than the lower resistance



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