Wireman – Semester 1 Module 7: Magnetism and Capacitor
163 : Which is dia magnetic substance?
A : Iron and nickel
B : Aluminium
C : Graphite
D : Copper
164 : What is the metal composition of Permalloy?
A : Iron and nickel
B : Iron and copper
C : Iron and aluminium
D : Iron and chromium
165 : What is the unit of permeability?
A : Weber/metre
B : No unit (mere number)
C : Ampere turns/web
D : Ampere turns/metre2
166 : Which property of a magnet is illustrated?
A : Induction property
B : Saturation property
C : Directive property
D : Poles-existing property
167 : Which factor depends on the permeability of the material?
A : Length
B : Flux density
C : Field intensity
D : Magneto motive force
168 : Which rule is used to find the direction of the self induced emf in a coil?
A : Clock rule
B : Lenz law
C : Ampere rule
D : Corkscrew rule
169 : Which rule is used for determine the direction of magnetic lines in a current carrying conductor?
A : Lenz law
B : Right hand palm rule
C : Fleming left hand rule
D : Fleming right hand rule
170 : Which rule is used to find the direction of the induced emf in a coil?
A : Clock rule
B : Lenz law
C : Ampere rule
D : Corkscrew rule
171 : Which rule is used to find the magnetic polarity of solenoid?
A : Lenz law
B : Right hand palm rule
C : Fleming left hand rule
D : Fleming right hand rule
172 : What is the purpose of corkscrew rule?
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
173 : What is the name of the part marked as X?
A : Magnetic saturation
B : Coercivity force
C : Residual magnetism
D : Origin point
174 : What is the name of property that the flux density always lagging behind the magnetising force?
A : Hysteresis
B : Magnetic intensity
C : Magnetic induction
D : Residual magnetism
175 : Which is determined by BH curve?
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
176 : Which force is required to demagnetise the residual magnetism in the hysteresis loop?
A : Electromotive force
B : Magneto motive force
C : Counter induced emf
D : Coercive force
177 : Which is the example for inductor?
A : Choke
B : Transformer
C : Buzzer
D : Electric bell
178 : Which law states whenever the magnetic flux is linked with a circuit changes an emf is always
induced it?
A : Faraday´s law of electromagnetic induction
B : Lenz law
C : Fleming left hand rule
D : Corkscrew rule
179 : What is unit of inductance?
A : Weber
B : Henry
C : Ampere turns
D : wb/m2
180 : Which law is used to determine the induced emf in a conductor?
A : Fleming left hand rule
B : Fleming right hand rule
C : Lenz’s law
D : Faraday’s law of electromagnetic induction
181 : Which formula used to calculate the magnitude of induced emf?
182 : Which formula is used to find capacitance?
A : C = QV
B : C = Q+V
C : C=V/Q
D : C=Q/V
183 : What is the formula to calculate the total capacitance (C) if three capacitors (C1, C2, C3) connected in series?
184 : Which factor is inversely proportional to the value of capacitance?
A : Dielectric strength
B : Thickness of the plate
C : Area of the plate
D : Distance between the plates
185 : Which type of capacitor is known as polarised capacitor?
A : Mica capacitor
B : Paper capacitor
C : Ceramic capacitor
D : Electrolytic capacitor
186 : Which material has high dielectric constant?
A : Air
B : Paper
C : Ceramic
D : Polyester
187 : What is the value of capacitance, if it stores 1 coulomb of charge at 1 volt?
A : 1 watts
B : 1 ohm
C : 1 farad
D : 1 henry
188 : Which dielectric material is used in capacitor?
A : Empire cloth
B : Milinex paper
C : Ceramic
D : Insulating varnish
189 : Where the variable air capacitors are used?
A : Radio receivers
B : Oscillators
C : Amplifiers
D : RF filters
190 : Which type of capacitor is used for space requirements?
A : Plastic film type
B : Ceramic disc type
C : Electrolytic – Aluminium
D : Electrolytic – Tantalum type