Wireman – Semester 1, Module 7: Magnetism and Capacitor

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Common for Wireman Trade 1st Year

NAME *

NAME OF THE ITI *

MOBILE NUMBER *

1 : Which is dia magnetic substance? *

2 points

A : Iron and nickel

B : Aluminium

C : Graphite

D : Copper

2: What is the metal composition of Permalloy? *

2 points

A : Iron and nickel

B : Iron and copper

C : Iron and aluminium

D : Iron and chromium

3: What is the unit of permeability? *

2 points

A : Weber/metre

B : No unit (mere number)

C : Ampere turns/web

D : Ampere turns/metre2

4: Which property of a magnet is illustrated? *

2 points

A : Induction property

B : Saturation property

C : Directive property

D : Poles-existing property

5 : Which factor depends on the permeability of the material? *

2 points

A : Length

B : Flux density

C : Field intensity

D : Magneto motive force

6 : Which rule is used to find the direction of the self induced emf in a coil? *

2 points

A : Clock rule

B : Lenz law

C : Ampere rule

D : Corkscrew rule

7: Which rule is used for determine the direction of magnetic lines in a current carrying conductor? *

3 points

A : Lenz law

B : Right hand palm rule

C : Fleming left hand rule

D : Fleming right hand rule

8 : Which rule is used to find the direction of the induced emf in a coil? *

2 points

A : Clock rule

B : Lenz law

C : Ampere rule

D : Corkscrew rule

9: Which rule is used to find the magnetic polarity of solenoid? *

2 points

A : Lenz law

B : Right hand palm rule

C : Fleming left hand rule

D : Fleming right hand rule

10: What is the purpose of corkscrew rule? *

2 points

A : To find direction induced emf

B : To find direction of rotation of the conductor

C : To find direction of the current flowing in the conductor

D : To find direction of magnetic lines around the conductor

11: What is the name of the part marked as X? *

2 points

A : Magnetic saturation

B : Coercivity force

C : Residual magnetism

D : Origin point

12 : What is the name of property that the flux density always lagging behind the magnetising force? *

3 points

A : Hysteresis

B : Magnetic intensity

C : Magnetic induction

D : Residual magnetism

13 : Which is determined by BH curve? *

2 points

A : The retentiveness of the material

B : The field intensity of the substance

C : The magnetic properties of the material

D : The pulling power of the magnetic material

14 : Which force is required to demagnetise the residual magnetism in the hysteresis loop? *

3 points

A : Electromotive force

B : Magneto motive force

C : Counter induced emf

D : Coercive force

15 : Which is the example for inductor? *

2 points

A : Choke

B : Transformer

C : Buzzer

D : Electric bell

16: Which law states whenever the magnetic flux is linked with a circuit changes an emf is always induced it? *

3 points

A : Faraday´s law of electromagnetic induction

B : Lenz law

C : Fleming left hand rule

D : Corkscrew rule

17 : What is unit of inductance? *

2 points

A : Weber

B : Henry

C : Ampere turns

D : wb/m2

18 : Which law is used to determine the induced emf in a conductor? *

2 points

A : Fleming left hand rule

B : Fleming right hand rule

C : Lenz’s law

D : Faraday’s law of electromagnetic induction

19 : Which formula used to calculate the magnitude of induced emf? *

2 points

20 : Which formula is used to find capacitance? *

2 points

A : C = Q x V

B : C = Q+V

C : C=V/Q

D : C=Q/V

21 : What is the formula to calculate the total capacitance (C) if three capacitors (C1, C2, C3)connected in series? *

2 points

22 : Which factor is inversely proportional to the value of capacitance? *

2 points

A : Dielectric strength

B : Thickness of the plate

C : Area of the plate

D : Distance between the plates

23 : Which type of capacitor is known as polarised capacitor? *

2 points

A : Mica capacitor

B : Paper capacitor

C : Ceramic capacitor

D : Electrolytic capacitor

24 : Which material has high dielectric constant? *

2 points

A : Air

B : Paper

C : Ceramic

D : Polyester

25 : What is the value of capacitance, if it stores 1 coulomb of charge at 1 volt? *

2 points

A : 1 watts

B : 1 ohm

C : 1 farad

D : 1 henry

26: Which dielectric material is used in capacitor? *

2 points

A : Empire cloth

B : Milinex paper

C : Ceramic

D : Insulating varnish

27: Where the variable air capacitors are used? *

2 points

A : Radio receivers

B : Oscillators

C : Amplifiers

D : RF filters

28 : Which type of capacitor is used for space requirements? *

2 points

A : Plastic film type

B : Ceramic disc type

C : Electrolytic - Aluminium

D : Electrolytic - Tantalum type

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