class 2 midterm part 3

1. 1
   The secondary winding of a step-down transformer has _____________ than the primary winding.

   1. Alower voltage
   2. Bhigher power
   3. Chigher capacitance
   4. Dlower current
2. 2
   For a sine wave, the Peak value is:

   1. A1.414 times the R.M.S. value.
   2. Bless than the average value
   3. Cone half the R.M.S value.
   4. D. zero.
3. 3
   The leads from a low voltage winding of a transformer are often identified as:

   1. AB1 & B2
   2. B. A1 & A2
   3. CH1 & H2
   4. DX1 & X2
4. 4
   In a pure (ideal) inductance:

   1. APower is only dissipated if the inductor is in parallel
   2. BNo power is dissipated
   3. CPower is always dissipated.
   4. DPower is only dissipated if the inductor is in series.
5. 5Losses occurring in typical real transformers mainly appear as _____.

   1. Aexcess voltage
   2. Bheat
   3. Cexcess current
   4. D. DC
6. 6
   If a transformer has 800 turns in the primary winding and 1600 turns in the secondary winding and 240 V is applied to the primary, the secondary voltage will be _________. *
   0/2
   

   1. A480V
   2. B1150v
   3. C230v
   4. D120v
7. 7
   Whenever charge moves through space (when current flows) a magnetic field exists.

   1. AVerdadero
   2. BFalso
8. 8Series components all share the same voltage.

   1. AVerdadero
   2. BFalso
9. 9Parallel capacitors add their values like resistors in series.

   1. AVerdadero
   2. BFalso
10. 10Normally Open contacts are connected to the Common when the coil of the relay is energized.

    1. AVerdadero
    2. BFalso

11. 11
    In a transformer, if voltage is stepped up, current will:

    1. Abe stepped up
    2. Bbe stepped down
    3. Cstay the same
    4. Dgo to zero
12. 12Relays are typically designed for

    1. Aswitching power to loads.
    2. Bcontrolling a large current with a small current.
    3. C_either_ AC or DC control, but not both
    4. Dany or all of the above.
13. 13
    Inductance is measured in ___________.

    1. AHertz
    2. BHenrys
    3. CFarads
    4. DOhms
14. 14An inductor can be constructed from

    1. Aa coil of wire wrapped around a core of iron
    2. Ba simple coil of wire.
    3. Ceither a. or b.
    4. Dcapacitors.
15. 15
    The voltage on the secondary of a step-up transformer is ____________.

    1. Aless than that of the primary.
    2. Bgreater than that of the primary.
    3. Cthe same as that of the primary
    4. Dzero.
16. 16To find the average voltage of a sine wave:

    1. AMultiply the Peak voltage by 120
    2. BMultiply Peak voltage by 0.636
    3. CFind the resistance
    4. DGuess
17. 17
    Two materials that are classified as magnetic materials are:

    1. Awood and glass
    2. Bgold and silver
    3. Caluminum and copper
    4. Diron and nicklel
18. 18
    In an ideal transformer, the primary power is _________the secondary power. *

    1. Aless than
    2. Bequal to
    3. Cgreater than
    4. Dnot as important as
19. 19Around a magnet, the external lines of magnetic flux

    1. A. change at random.
    2. Bare said to leave the magnet from the north pole and enter the south pole.
    3. Cdon’t actually exist.
    4. Dare said to leave the magnet from the south pole and never return.
20. 20The secondary winding of a 1:1 (turns ratio) isolation transformer has __________ the primary winding

    1. Ahigher voltage than
    2. Bhigher current than
    3. Cmore power than
    4. Dthe same voltage as

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Test sobre class 2 midterm part 3 , creado por Regino Callan el 30/11/2020.

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Regino Callan

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