TT ELECTRICIAN 1ST YEAR

Which rule is applied to find the direction of magnetic field in a solenoid coil?

• Cork screw rule

• Right hand palm rule

• Flemings left hand rule

• Flemings right hand rule

What is the unit of Reluctance?

• Weber / metre2

• Weber / metre

• Ampere turns / Weber

• Ampere turns / metre2

Which defines the flux density is always lagging behind the magnetising force?

• Hysterisis

• Magnetic intensity

• Magnetic induction

• Residual magnetic

What is the S.I unit of Flux density?

• Tesla

• Weber

• Weber/metre

• Ampere-turns

What is the unit of Magneto Motive Force (MMF)?

• Ampere / M2

• Ampere – Metre

• Ampere - turns

• Ampere / turns

Which is the diamagnetic substance?

• Air

• Steel

• Water

• Platinum

Which method of magnetization is used to make commercial purpose permanent magnets?

• Induction method

• Single touch method

• Double touch method

• Divided touch method

How can you increase the pulling strength of an electromagnet?

• increase the field intensity

• Reduce the current in the coil

• Reduce the number of turns in the coil

• Increase the B-H curve of the material

What will happen, if the polarized electrolytic capacitor is reversely connected?

• No effect on the capacitor

• Explode due to excessive heat

• Current is reduced in the circuit

• Value of capacitance will be increased

What electrical quantities are related in Ohm's law?

• Current, resistance and power

• Current, voltage and resistivity

• Current, voltage and resistance

• Voltage, resistance and current density