A 200-watt lamp working for 24 hours will consume approximately _____ units.
Correct Answer :
B.
Related Questions
The relation between absolute permittivity of air ( 0)a absolute p and velocity of light (c) is given by
0 0= c^2
0 0= c
1/ 0 0= c
1/ 0 0= c^2
Back emf refers to the
Current equal to the applied emf
Opposing emf
Current opposing the applied emf
Voltage opposing the applied emf
The current of electric circuit is analogous to which quantity of a m
Mmf
Flux
Flux density
R eluctivity
Small voltages generated by a conductor with current in an external magnetic field.
Skin effect
Magnetic effect
Hall effect
Flywheel Effect
The magnetic flux of 2000 lines is how many Maxwells?
The uncharged particles which have no effect on its atomic charge.
Nucleons
Electrons
Protons
Neutrons
The mass of proton is __________ the mass of an electron.
equal to
about 1837 times
less than
200 tim es
Ohm's law can be used only to a _____ circuit or component.
Unilateral
Exponential
Trivalent
Linear
The energy stored in an electrostatic field or electromagnetic field is called
Electromagnetic energy
Kinetic energy
Potential energy
R est energy
What is the main advantage of temporary magnets?
The magnetic flux can be changed.
Hysteresis can be decreased.
Magnetic materials can be used.
Abundance of ferromagnetic material that can be temporarily magnetized.
A group of magnetically aligned atoms is called
Range
Lattice
Domain
Crystal
One of the common application of an air- cored choke.
Radio frequency
Audio frequency
Power supply
Power transformer
The emf induced in a coil due to the changing current of another neighboring coil is called
Mutually induced emf
Self induced emf
Statically induced emf
Dynamically induced emf
Magnetic intensity is a
Phasor quantity
Physical quantity
Scalar quantity
Vector quantity
The air space between poles of magnets
Air gap
Free space
Vacuum
Atmosphere
__________ is a substance of whose molecules consist of the same kind of atom.
Mixture
Compound
Element
Isotope
The electrons in the last orbit of an atom are called _______ electrons.
free
valence
bound
thermionic
If the distance between two magnetic poles decreases by 2 timesa the force between them
decreases two times
increases four times
increases two times
decreases four times
The hot resistance of an incandescent lamp is about _______ its cold resistance.
10 times
100 times
5 times
50 times
The core of a transformer heats up when its primary is fed from an ac source because of
permeability
ferromagnetism
reluctance of core
hysteresis loss
A commercial alloy of aluminum nickela and iron with cobalta copper and titanium added to produce about 12 grades.
Alnico
Brass
Aluminum
Constantan
If the number of valence electrons of an atom is less than 4a then the substance is probably
a metal
an insulator
a non-metal
a semiconductor
A 200-watt lamp working for 24 hours will consume approximately _____ units.
If a 20 V potential is applied across a relay coil with 50 turns having 1 ? of resistancea the total magnetomotive producing magnetic flux in the circuit is
10 Wb
50 T
1000 A t/m
1000,t
Which of the following is used by permanent magnets as the magnetic material?
iron
nickel
soft steel
hardened steel
Steel is hard to magnetize because of its
Low permeability
High permeability
High density
High retentivity
Electromotive force in a circuit
causes free electrons to flow
increases the circuit resistance
maintains circuit resistance
is needed to make the circuit complete
How much is the flux in Weber in the above problem?
2 x 10^-5
2 x 10^-3
2 x 10^5
2 x 10^3
If the value of 25 a conductor is 1/255 per oCa then the value of 20is
1/300 per oC
1/250 peroC
1/230 per oC
1/260 per oC
The branch of Engineering which deals with the magnetic effect of electric current is known as
Magnetism
Electromagnetism
Electrical engineering
Electronics engineering