mphasis Heading 1 1 NormalStrongSubtitle Title Colorful.... Intense Q... . Subtl

Question

mphasis Heading 1 1 NormalStrongSubtitle Title Colorful.... Intense Q... . Subtle Em.. Styles 6) A transformer has two identical secondary windings, except that one has three times the number of turns of wire. Which winding will produce the higher voltage? a) The one with the larger number of turns of wire b) The one with the smaller number of turns of wire c) Neither, the number of windings is of no importance Transformer Ratios 7) A transformer has a 120V rated primary winding and a secondary winding rated at 6. What is its turns ratio? a) 20 to 1 b) 1.41 to1 c) 1 to 1.41 d) 1 to 20 Transformer Formulas 8) When a transformer is used to impedance match a 2000 obm source to a 20 ohm load, its turns ratio must be: a) 2 to 1 b) 4 to 1 c) 10 to 1 d) 100 to 1 e) 1000 to 1 Transformer Formulas 2.4KV is applied to the primary of a step-down transformer, producing a primary current of 15A. If the turns ratio of this unit is 10:1, its secondary ratings (with no power loss) would be: 9) a) 150A at 24KV b) 1.5A at 240V c) 150A at 240V d) 1.5A at 24KV Transformer Formulas

Explanation / Answer

6) A transformer has two identical windings,except that one has three times the number of turns of wire

The one with larger number of turns of wire because more number of turns of windings have more voltage

so option a is correct.

7) primary winding voltage (Vp)=120 V

Secondary winding voltage(Vs)=6V

Turns ratio=Vp/Vs

Turns ratio=(120/6)

turns ratio=20:1

option a is correct

8) given impedance source(Zs)= 2000 ohms

load impedance (Zl) =20 ohms

turns ratio(n)=squareroot of(Zl/Zs)

n=squareroot of (20/2000)

n=Square root of(1/100)

n=1/10

option c is correct

9) given primary voltage(Vp)=2.4Kv

primary current=15 A

turns ration 10:1

turns ratio (n)=Vp/Vs

10/1=2.4Kv/Vs

Vs=2400/10

Vs=240 V

turns ratio=(Is/Ip)

10/1=Is/15

Is=150 A

option C is correct

n

Related Questions

Navigate

• Browse (All)
• Browse M
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.