EE-Objectives- DC Circuits

conventional

What is the basis for declaring the direction of electric current is from positive terminal to negative terminal of a circuit?

Nichrome

Which of the following conductors has the highest resistance?

decreases

In American wire gauge (AWG) as the number gage increase the wire diameter

the electrons are not moving

The current is zero in a conductor when NO potential difference is applied because

FVT

Suppose that the fundamental dimensions are taken to be force (F), velocity (V) and time of potential energy?(T). What are the dimensions

Secondary cell

It is a cell designed to produce electric current and can be recharged.

linear bilateral elements

Superposition theorem can be applied only to circuits having____________

reciprocity theorem

. "In any linear bilateral network, if a source of emf E in any branch produces a current / in any other branch, then same emf acting in second branch would produce the same currentI in the first branch". The above statement is associated with

Norton's Theorem

If an electrical network having one or more voltage source, is transformed into equivalent electrical network with single voltage source (which is short circuit current of previous circuit) with parallel internal resistance of the network with all current source replaced by their internal resistance

Middle

In Flemming's Right Hand Rule, which finger point the direction of current

maximum when the plane of the loop is parallel to "B"

The magnetic torque exerted on a flat current-carrying loop of wire by a uniform magnetic A. maximum when the plane of the loop is perpendicular to "B" field "B" is____________

ampere-meter^2

The units of magnetic dipole moment are

dia-magnetic

A substance or material having relative permeability of less than unity is classified as:

conductivity

Permeability in a magnetic circuit corresponds to in an electric circuit

Lenz's law/

The direction of induced e.m.f can be found by

flux

In electromagnetic induction three of the following terms are identical. Name the ONE that is NOT

Inductors behave as short circuit

Which of the following statements is TRUE for steady-state conditions in a circuit powered by a dry cell?

mutually induced

An emf induced A speed by the changing of current in the neighboring coil is called

1/r^2

The coulomb force, F, acts on two charges a distance, r. apart. What is F proportional to

The charge is confined to the region in which the charge was placed

Which statement about a charge placed on a dielectric material is TRUE?

. it will get punctured

What will happen to an insulating medium with voltage more than breakdown voltage is applied?

Farad/meter

Permittivity is expressed in

Elastance

The inverse capacitance is called

Thickness of the plates

For which of the following parameter variation, the capacitance of the capacitor remains unaffected

Galvanometer

Which of the following can be used to measure small dc generated

by pass the current

The function of shunt in an ammeter is to

heating, magnetic & electric shock

The presence of electric current is only made known by the effect it produces. Three important effects are:

Graphite

Out of the following, select the best conductor of electricity

voltage

Electric pressure in an electric circuit is also called

Brown & Sharpe

. What is the other term for American Wire Gauge

current

Two wires of the same material have the same lengths but different diameters. They are connected in SERIES to a battery. Which of the following quantity is the same for the two wires

power are additive

Which of the following statement is TRUE both for series and a parallel DC circuit

Sulfation

Over charging of lead-acid battery is likely to result in

the plates will become sulphated

. What will happen if a Lead-acid battery is kept in discharged condition for long time

WH output based on WH input in recharge

What is the watt-hour efficiency of storage battery

i^2

It was experimentally found by James Prescott Joule that the heat produced in a current carrying conductor is proportional to

distributed parameters

Kirchoff's law is not applicable to circuit with

B

Which of the following statements is TRUE?

A. An ideal current source cannot be in parallel with a short circuit

B. An ideal voltage source can be in parallel with an open circuit

C. An ideal current source can be in series with an open circuit.

D. An ideal voltage source cannot be in series with an ideal current source.

it is dimensionless

The unit of relative permeability is

pole strength

The unit of magnetic flux is the same as that of

Induction heating

What is the heating process makes use of the currents induced by the electromagnetic action in the charge to be heated, used for hardening of steel

ceramics

Which of the following materials has the highest value of dielectric constant

semiconductors

Ohm's law can be applied with certain reservations to

effects produced

The presence of an electric current is made known by

seen, touched

An electric current can neither be ___nor ___

a force

. Voltage applied across a circuit, acts as

supply wires are made of superior material resistance of heater coil is more than that supply wires

When current flows through heater coil it glows but supply wiring does not glow because

wire wound resistors

Resistors commonly used in power circuits are

a column of mercury

International ohm is defined in terms of resistance of

Thermistor

Which of the following has negative coefficient of résistance

iodestones

a natural magnet is called

nickel, cobalt and steel

A magnet is able to attract

north to south

Externally, magnetic line of force travel

soft irom

A material commonly used for shielding or screening
magnetism is

residual

The magnetism that remains in a magnet after the magnetising force has been removed is called

near to one end of a magnet

Iron becomes magnetized by induction when it is

Flux

Magnetic lines of force are called

in inverse proportion to the square of the distance

The force between two magnetic poles varies with distance between them. The variation is

M.M.F

. The magnetic potential in a magnetic-circuit can be measured in terms of

conductance

Permeance is analogous to

the magnetization left in the iron after exciting field has been removed
the conductivity of a material for magnetic lines of
force

The permeability of a material means

slightly greater than 1

The relative permeability of paramagnetic substance is

(i) electrons orbital motion
(ii) electron spin
(ii) spin of the nucleus about its axis

The magnetization in any magnetic material appears as
a result of

magnetization

The sum of the magnetic moments in unit volume of the
solid is called

Diamagnet

Which of the following materials does not have per manent magnetic dipole

Paramagnetic material

Interaction between the neighbouring dipoles is negligible in case of a.

5000

The relative permeability u for iron is

Carbon steel
Alnico V
Platinum çobalt

Which of the following material is used for making
permanent magnets

semi-conductor

Ferrimagnetic materials generally behave as

ferrites

Transformer cores operating at microwave frequency ranges are generally made up of

softmagnetic material

The magnetic materials which can be easily magnetized in both the directions are known as

increasing the resistance of magnetic medium

Eddy current loss can be minimized by