Transformers

A transformer works on the principle of:

• Self Induction

• Electrostatic Induction

• Mutual Induction

• Electromagnetic Emission

In a transformer, the core is made of

• Copper

• Iron

• Aluminum

• Silicon

The function of a step-up transformer is to

• Decrease voltage

• Increase voltage

• Decrease current

• Increase power

The turns ratio of a transformer is defined as:

• Primary voltage to secondary voltage

• Secondary voltage to primary voltage

• Primary turns to secondary turns

• Secondary turns to primary turns

The main purpose of using laminated cores in transformers is to

• Reduce copper loss

• Reduce eddy current loss

• Increase magnetic flux

• Reduce weight

If the load on the secondary side of a transformer increases, the primary current

• Decreases

• Remains the same

• Increases

• Fluctuates

The capacitance of a parallel plate capacitor depends on

• Plate thickness and material

• Voltage applied

• Plate area and plate separation

• Current through the plates

The SI unit of capacitance is

• Ohm

• Farad

• Tesla

• Volt

What happens to the capacitance of a parallel plate capacitor when the distance between the plates is halved?

• Capacitance remains the same

• Capacitance is doubled

• Capacitance is halved

• Capacitance becomes zero

A dielectric material placed between the plates of a capacitor

• Increases the capacitance

• Decreases the capacitance
  

• Has no effect on the capacitance
  

• Reduces the electric field