Magnets,Transfomr,circuit breaker

Which component opposes any change in current?

• Diode

• Resistor

• Inductor

• Capacitor

Which factor determines the inductance value?

• Material of the coil

• Diameter of the coil

• Frequency of the current

• Current flow

How much the impedence of the circuit which have R = 30 ohm and Xc= 40 ohm

• 20

• 30

• 40

• 50

Find the total inductance value of 2 inductors 20H and 30 H are connected in series

• 15

• 30

• 40

• 50

What is the name of effect of changing current in on coil,and induces an EMF in nearby coil?

• coupling

• Induction

• Self Induction

• Mutual Indution

Which electrode controls brightness of the image on the screen of oscilloscope?

• Anode

• Cathod

• Control Grid

• Focussing electrode

Which of the following is not a unit of flux?

• Maxwell

• Tesla

• Weber

• All of them

Which property of capacitor stores electrical energy in Electro magnetic field?

• Dielectric

• Capacitance

• Stray capacitor

• Capcitive reactance

Capacitor consist of two parallel

• Conductors

• Semi conductors

• Inductor

• Insulator

The capcitor to be fully charged only after a period of more than

• Three time constant

• Two time constant

• Five time constant

• One time constant