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A) IS= 10IP

B) NS = NP I 10

C) NS = 10NP

D) VS = VP / 10

A) 0 V

B) 30 V

C) 15 V

D)  60 V

## 283. Iron core is used in transformer to:

A) Enhance the flux

B) Decrease the flux

C) Keep the flux same

D) Both A and B

## 284. Transformers work on the Principle of:

A) Self Induction

B) Mutual Induction

C) Electrostatics

D) Induction

## 285. Equation for transformer is

A) NS / V= VS / NS

B) NS / NP = VP / VS

C) VS/VP = NS / NP

D) VP / NP = NS /NP
A

## 286. The number of lines of force in a magnetic field depends upon:

A) Shape of Coil

B) Size of Coil

C) Magnet

D) Strength of Field

## 287. If current is flowing from bottom end to the top end in a wire, according to right hand rule the direction of line force will be:

A) Anti clock wise

B) Clock wise

C) Left to right

D) Along the conductor

## 288. The End of the solenoid from which the lines of force emerge out is called:

A) North Pole

B) South Pole

C) North and South Pole

D) none

## 289. The End of the Solenoid from which lines of force enter is called:

A) North Pole

B) South Pole

C) North and South Poles

D) None

## 290. The magnetic field of the solenoid resembles:

A) Iron Wire

B) U shape magnet

C) Bar Magnet

D) Point charge

## 291. A current carrying conductor produces a field around it is called:

A) Elecrtric Field

B) Magnetic Field

C) Both A and B

D) None

## 292. According to Fleming’s Left hand rule the direction of the magnetic field is indicated by:

A) Thumb

B) Forefinger

C) Middle Finger

D) Right hand Rule

A) Thumb

B) Fore Finger

C) Middle Finger

D) None

A) 0⁰

B) 90⁰

C) 180⁰

D) 45⁰

A) 0⁰

B) 70⁰

C) 45⁰

D)60⁰

A) Steel

B) Carbon

C) Copper

D) Iron

B) Fleming

C) Ohm

D) Coulomb

A) 1841

B) 1831

C) 1821

D) 1811

A) Magnetic

B) Heat

C) Electrical

D) Chemical

A) DC Motor

B) Transformer

C) AC Generator

D) A and B