Physics 10 Chapter 15 - Electromagnetism - 16

Physics 10 Chapter 15 - Electromagnetism - 16

1. The power dissipated by an ideal transformer is equal to.................?

a) 1 W
b) 10 W
c) 100 W
d) Zero

2. Which of the following equation is true for an ideal transformer?

a) Pp / Ps = Ps
b) Pp = Ps
c) Vp / Ip = Vs Is
d) Vp / Ip = Vs / Is

3. A step-up transformer has a turn ratios of 1:100. An alternating supply of 20 V is connected across the primary coil. What is the secondary voltage?

a) 200 V
b) 2000 V
c) 100 V
d) 10 V

4. What is the equation for an ideal transformer?

a) Vp Ip < Vs Is
b) Vp Ip > Vs Is
c) Vp Ip = Vs Is
d) Vs Ip = Vp Is

5. A transformer is needed to convert a mains 240 V supply into a 12 V supply. If there are 2000 turns on the primary coil, then find the number of turns on the secondary coil?

a) 1000
b) 200
c) 100
d) 20

6. The turn ratios of a transformer are 10. What does it mean?

a) Is = 10 Ip
b) Ns = Np /10
c) Vs = Vp /10
d) Ns = 10 Np

7. Which of the following equation is true for an ideal transformer?

a) Vp / Ip = Vs / Is
b) Pp = Ps / Pp
c) Vp Ip = Vs Is
d) Pp / Ps = Ps

8. A transformer, designed to convert the voltage from 240 V A.C. mains to 12 V, has 4000 turns on the primary coil. How many turns should be on the secondary coil?

a) 1000 turns
b) 100 turns
c) 2000 turns
d) 200 turns

9. For an ideal transformer we can write?

a) Pp < Ps
b) Pp = 0
c) Pp = Ps
d) Pp > Ps

10. A step up transformer has turns ratio 1:20. When 100 V are supplied to the primary coil, what will be the secondary voltage?

a) 4000
b) 3000
c) 2000
d) 1000

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