2000V- 200V, 20kVA transformer has 66 turns in the secondary. Calculate the primary and secondary full-load current, neglect power losses in transformer.
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A heater coil is rated 100W,200V. It is cut into two identical parts. Both parts are connected together in parallel, to the same sources of 200V. Calc
`because P= =(V^(2))/(R) therefore R=(V^(2))/(P)=((200)^(2))/(100)=400Omega` Resistance of half piece `=(400)/(2)=200Omega` Resistance of pieces connected in parallel `=(200)/(2)=100Omega` Energy liberated/sec ond `=P=(V^(2))/(R)=(200xx200)/(100)=400W`
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Two bulbs of (40W 200V) and (100W 200V). Then correct relation for their resistances:
`P=(V^(2))/(R),Pprop(1)/(R)` i.e. `R_(40)gtR_(100)`
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A transformer has 50 turns in the primary and 100 in the secondary. If the primary is connected to a `220 V DC` supply, what will be the voltage acros
Correct Answer - zero Transformer does not work on `D.C.`
2 Answers 1 views
In a transformer ratio of secondary turns `(N_(2))` and primary turns `(N_(1))`,i.e. `N_(2)/N_(1)=4`.if the voltage applied in primary is `200 V,50 Hz
Correct Answer - (a)`800 V` , (b)(i)`0.25 A` ,(ii)`0.2 A`. (a)`V_(2)/V_(1)=N_(2)/N_(1)=4 , rArrV_(2)=200xx4=800` (b)(i)`I_(2)/I_(1)=N_(2)/N_(1)=1/4 rArr i_(2)=1/4=0.25 A` (ii)`I_(1)V_(1)xx0.80=V_(2)I_(2) rArr I_(2)=0.8xx0.25=0.2 A` (a)`V_(2)/V_(1)=N_(2)/N_(1)=4 , rArrV_(2)=200xx4=800` (b)(i)`I_(2)/I_(1)=N_(2)/N_(1)=1/4 rArr i_(2)=1/4=0.25 A` (ii)`I_(1)V_(1)xx0.80=V_(2)I_(2) rArr I_(2)=0.8xx0.25=0.2...
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A power transformer (step up) with an `1:8` turns ratio has `60 Hz,120 V` across the primary, the load in the secondary is `10^(4) Omega`.The current
Correct Answer - D `V_(2)/V_(1)=N_(2)/N_(1)=8/1 rArrV_(2)=8xx120=960` volt `rArrI=960/10^(4)=96 mA`.
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The overall efficiency of a transformer is `90%`.The transformer is rated for an output of `9000` watt.The primary voltage is `1000` volt.The ratio of
Correct Answer - C `E_(2)/E_(1)=N_(2)/N_(1)=1/5` `E_(2)=1000/5=200` volt.
2 Answers 2 views
The overall efficiency of a transformer is 90%. The transformer is rated for an output of 9000 watt. The primary voltage is 1000 vot. The ratio of tur
Correct Answer - B `E_(2)I_(2)=9000+200` `I_(2)=9200/200=46 A`.
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A transformer has 200 turns in primary coil and 600 turns in secondary coil. If a 220 V DC is applied across primary coil what will be the voltage acr
Correct Answer - `0`
2 Answers 1 views
In a full wave junction diode rectifier, the input a.c. has an rms value of `10V`. The transformer used is a step up transformer having transformation
Correct Answer - `18.01V, 8.62V`
2 Answers 1 views
In a transformer, the ratio of the number of turns in the secondary coil to that in the primary coil is 10:3. Such a transformer is called_______trans
Correct Answer - Electromagnetic induction
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