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Physics 10 Chapter 15 - Electromagnetism - 14
1.
When the primary coil is connected to a source of A.C. voltage, what does the changing current creates?
a) A static electric field
b) A changing electric field
c) A changing magnetic field
d) A static magnetic field
2.
In the secondary coil, what does the changing magnetic field produces?
a) An alternating e.m.f
b) A static e.m.f
c) A static magnetic field
d) An alternating magnetic field
3.
What is the symbol for representing the secondary voltage?
a) V(s-p)
b) Vp
c) Vs
d) V(p-s)
4.
What is the symbol for representing the primary voltage?
a) Vp
b) V(p-s)
c) V(s-p)
d) Vs
5.
What is the e.m.f. called that is induced in the secondary coil?
a) Primary current
b) Secondary current
c) Primary voltage
d) Secondary voltage
6.
Which of the following formula is true about transformer relation?
a) Vp / Vs = Ns / Np
b) Vs / Vp = Ns / Np
c) Vp = Ns / Np
d) Vs / Vp = Np / Ns
7.
How many types of transformer are there?
a) Five
b) Three
c) Two
d) Four
8.
If the secondary voltage is larger than the primary voltage, then what is the transformer called?
a) Mutual transformer
b) Step-down transformer
c) Ideal transformer
d) Step-up transformer
9.
Which of the following statement is correct about step-up transformer?
a) Has less turns in the secondary coil
b) Increases the input voltage
c) Increases the input current
d) Has more turns in the primary coil
10.
In Mutual induction, number of coils are.......?
a) 2
b) 1
c) 3
d) 4
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