1. The magnetically operated device that can change values of voltage, current,
ID: 2080880 • Letter: 1
Question
1. The magnetically operated device that can change values of voltage, current, and impedance without changing frequency is the _____.
a.
converter
b.
inverter
c.
transformer
d.
transistor
2. In a transformer, the turns of primary wire compared to the turns of secondary wire is called the _____ ratio.
a.
isolation
b.
step-up
c.
step-down
d.
turns
3. The transformer winding, which is the power input winding, is called the _____ winding.
a.
primary
b.
secondary
c.
tertiary
d.
tapped
4. The transformer winding, which is the output winding, is called the _____ winding.
a.
primary
b.
secondary
c.
tertiary
d.
tapped
5. A transformer in which the primary and secondary are physically separated and not connected by a conductor is called a(n) _____ transformer.
a.
isolation
b.
step-up
c.
step-down
d.
turns
6. In a transformer, even when there is no load connected, there will be some small current flow known as _____ current.
a.
excitation
b.
primary
c.
secondary
d.
hysteresis
7. A transformer in which the secondary voltage is less than the primary voltage is called a(n) _____ transformer.
a.
step-up
b.
isolation
c.
step-down
d.
auto
8. A transformer in which the secondary voltage is more than the primary voltage is called a(n) _____ transformer.
a.
step-down
b.
step-up
c.
isolation
d.
auto
9. A transformer has a 2:1 turns ratio. 120 V is applied to the primary. What is the secondary voltage?
a.
24 V
b.
60 V
c.
120 V
d.
600 V
10. A transformer has a 240 V primary and a 60 V secondary. With a 5 ohm load connected, what is the primary current?
a.
2 A
b.
3 A
c.
7 A
d.
8 A
11. A transformer has a 240 V primary and a 120 V secondary. With a 30 ohm load connected, what is the primary volt-amps?
a.
4
b.
8
c.
480
d.
960
12. The transformer that converts a high voltage from the power company down to 240/120 V for homes and businesses is called a(n) _____ transformer.
a.
auto
b.
distribution
c.
control
d.
household
13. A transformer supplying a house with 240/120 V has a secondary which is center tapped. The conductor connected to the center is called the _____ conductor.
a.
equipment ground
b.
hot
c.
neutral
d.
ungrounded
14. The industrial use transformer that normally has 240 V or 480 V primary and a 120 V secondary is called a(n) _____ transformer.
a.
auto
b.
distribution
c.
isolation
d.
control
15. Most transformer cores are not made from a solid piece of metal. Instead, they are assembled from many thin sheets of metal. This type of construction is called _____.
a.
laminated
b.
toroid
c.
H core
d.
tape wound
16. A tape-wound core is assembled by _____.
a.
stacking small individual sheets of metal
b.
winding a long continuous tape into a spiral
c.
casting a solid core and wrapping it with tape
d.
bolting together two halves
17. The _____ transformer is constructed in a similar manner to the core type, except that the shell type has a metal core piece through the middle of the window.
a.
stacking-type
b.
shell-type
c.
casted-type
d.
bound-type
18. A tape-wound core is also called a(n) _____ core.
a.
toroid
b.
solid
c.
H
d.
E
19. Any transformer flux that does not follow the core and escapes into the surrounding air is called _____.
a.
magnetizing flux
b.
flux coupling
c.
flux leakage
d.
flux reactance
20. The amount of current that flows into a transformer primary when voltage is first applied is called _____ current.
a.
magnetizing
b.
excitation
c.
activating
d.
inrush
21. A transformer that has one winding, which is used for both the primary and secondary, is called a(n) _____.
a.
distribution transformer
b.
step-up transformer
c.
autotransformer
d.
control transformer
a.
converter
b.
inverter
c.
transformer
d.
transistor
Explanation / Answer
1)Answer: c.Transformer
2)Answer: d.turns ratio
3)Answer: a.primary
4)Answer: b.secondary
5)Answer: a.isolation
6)Answer: a.exitation current
7)Answer: c.step down
8)Answer: b.step up
9)Answer: b. 60v
Reason it was a step down transformer .i.e 120/2
=60 v
10)Answer: b. 3 A
12) Answer: b.distribution
13)Answer: b.hot conductor
14)Answer: d.control
15)Answer: a.laminated
17)Answer: b.shell type
18)Answer: d.E
19) Answer: d.flux leakege
20) Answer: d.inrush
21)Answer: c.auto transformer
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