Multiple Choice
Identify the
choice that best completes the statement or answers the question.
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1.
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A common application of mutual inductance is found in a device called a
______________.
a. | buzzer | c. | relay | b. | motor | d. | transformer |
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2.
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Which of the following is not a component of a transformer?
a. | Plate | c. | Primary | b. | Secondary | d. | Core |
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3.
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In order to calculate the output voltage of a transformer, divide the input
voltage by the ______________.
a. | frequency | c. | input current | b. | turns ratio | d. | resistance |
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4.
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Which of the following is a method to troubleshoot a transformer?
a. | Measuring the current flow | d. | All if the
above | b. | Measuring the weight of the transformer | e. | None of the above | c. | Measuring the
continuity of the coils |
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5.
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The power relationship on a transformer states that _____________.
a. | power in = power out + loss | d. | All of the
above | b. | power in = 1/2 power out | e. | None of the above | c. | power in = 2 x power
out |
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6.
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Transformers are usually rated in units called _____________.
a. | amperes | c. | volt amperes | b. | hertz | d. | ohms |
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7.
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The current load of a transformer is the current drawn by the
_____________.
a. | load connected to the transformer | c. | load connected to the
primary | b. | secondary with no load connected | d. | primary winding
itself |
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8.
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Which type of transformer is commonly used to reduce line voltages of 240 VAC or
480 VAC to 120 VAC?
a. | Isolation transformer | c. | Autotransformer | b. | Control Transformer | d. | Distribution
transformer |
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9.
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A common application of a center tap on the secondary of a transformer is a(n)
__________.
a. | autotransformer | d. | All of the above | b. | step-up transformer | e. | None of the above | c. | distribution
transformer |
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10.
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Which of the categories of transformers uses only one coil for the primary and
secondary?
a. | Distribution transformer | c. | Isolation
transformer | b. | Autotransformer | d. | Control Transformer |
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11.
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A ___________ is an electrical device that converts AC electricity from one
voltage level to another.
a. | transfomer | c. | secondary coil | b. | primary coil | d. | center tap |
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Matching
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Segment 1
a. | primary | d. | Mutual
Inductance | b. | transformer | e. | secondary | c. | turns ratio |
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12.
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____________ is the ability of one coil to induce voltage in another
coil.
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13.
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A(n) _________ is an electrical device that converts AC electricity from one
voltage level to another.
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14.
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The __________ coil of the transformer creates a magnetic field that is
concentrated by the core.
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15.
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The voltage induced in the ________ coil can be used to drive a load.
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16.
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The ___________ of a transformer determines the relationship between the
promary coil and the secondary coil.
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Segment 2
a. | transformer | d. | primary | b. | efficiency | e. | Volt-Amperes | c. | loss |
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17.
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Many machines require a(n) ___________ to step down the line voltage to the
machine’s operating voltage.
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18.
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Transfomers are usually rated in ___________.
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19.
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Because of the construction of a tranformer, there is usually a small amount of
__________ between the primary power and the secondary power.
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20.
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If a transformer is operated at something other than rated load and voltage,
the ___________ will be lower.
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21.
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The current load of a transformer is the current drawn by the ________ winding,
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Segment 3
a. | auto | d. | control | b. | center
tap | e. | distribution | c. | isolation |
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22.
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In a(n) ___________ transformer, the primary and secondary winding are
physically and electrically isolated.
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23.
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A(n) ___________ splits the secondary voltage in half.
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24.
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A(n) ___________ transformer is commonly used to reduce the line voltage from
480 VAC or 240 VAC to 120 VAC.
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25.
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The _________ transformer is used for homes and businesses to change the high
voltage of power company distribution lines to common 240/120 VAC supply.
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26.
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A(n) ___________ transformer uses the same coil for the primary and
secondary.
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