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Weekend Quiz. Back to Basics.

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Q.1. There are two resistors in series in a circuit, of 18 Ohms and 22 Ohms resistance. The current through the 18 Ohm resistor is 6 Amps. Calculate the supply Voltage to the circuit.


Q.2 There are three resistors of resistance 20 Ohms, 10 Ohms and 8 Ohms connected in parallel to a 6 Volt D.C. supply. Calculate:


a, The total resistance.


b, The current taken from the supply.


Q.3. A coil of 30 Ohms reactance is connected to a 200 Volt A.C. supply circuit, in series with a of 50 Ohms resistance. A capacitor of 30 Ohms reactance is connected in series with the coil. Calculate,


a, The circuit impedance.


b, The current drawn from the supply.


c, The power used.


Q.4. An electric heater uses 5.4MJ in 45 minutes. What is the rating of the element?


a, 1kW.


b, 1.5kW.


c, 2kW,


d, 3kW.


Q.5 The input of an electric motor is 5.8kW. The output is 4.75kW. The efficiency is,


a, 1.05%


b, 10.5%


c, 82%


d, 122%


Z.


Parents
  • 0
    A

    Hello Alasdair,

                           that just proves that time well spent in learning is a benefit in later life, rather than wasting time engaged in trivial pursuits. Good school and college education should be focused and concentrated, as that will provide good results. I think that we studied well because we enjoyed the subjects and did well as we applied ourselves, even to homework after school. (Please don't tell anyone, but I am not very clever. I did not make up the questions, I "borrowed" then from an I.E.T. book.....shhhhhh).


    Z.


    Z.
Reply
  • 0
    A

    Hello Alasdair,

                           that just proves that time well spent in learning is a benefit in later life, rather than wasting time engaged in trivial pursuits. Good school and college education should be focused and concentrated, as that will provide good results. I think that we studied well because we enjoyed the subjects and did well as we applied ourselves, even to homework after school. (Please don't tell anyone, but I am not very clever. I did not make up the questions, I "borrowed" then from an I.E.T. book.....shhhhhh).


    Z.


    Z.
Children
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Community Rules & Guidelines