WorksheetsMagnets,Transfomr,circuit breaker
Total questions: 25
Worksheet time: 18mins
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
Example of diamagnetic materials
Super condutors
Transition metals
Alkali metals
Ferrite
Example of para magnetic materials
Super conductors
Alkali metals
Transition metals
Ferrite
Unit if magnetic flux density?
Weber
Maxwell
Tesla
W/m2
ELCB works on the principle of
Overload current
short circuit
Residual current
Neutral current
Which devices can be used as switch as well as protective devices?
MCB
ELCB
Intermediate switch
SPDT
A 5F ,4.3 F and 0.6 F connected in parallel then find the total capacitance of the circuit?
9.9
.56
9.3
2.3
Quality factor is also known as
Voltage magnification
Current magnification
Resistance magnification
Impedence
The inductance of an iron coil decreases when
Number of turns decreases
The iron corr removed
The length of the coil decreases
None of the above
If the current in one coil becomes steady,then the current in neighbouring coil is
Zero
Infinity
Doubles
Halved
What is used as the electric material in high voltage transformer?
Mica
parfin
Parcelain
coiled paper
Why the transformer core is made as thin lamination
To maximize current
To maximise voltage
To minimize eddy current
To minimize voltage
ELCB are of
two type
one type
three type
none of these
Gauss is the unit of
Magnetic flux density
Force
Magnetic Field
Power
Whats if turns ratio of transformer?
Ns/Np
Np/Ns
Vp/Vs
Vs/Vp
What if voltage ratio of transformer?
Vp+Vs
Vp/Vs
Vs/Vp
1/Vp
