EE1 CIRCUITS

premopremo remo · 75問 · 2年前

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The flow of current in solids is due to

Electrons

The draft velocity of electrons is

a very small as compared to speed of light

One commercial unit of energy equals

One kilowatt-hour

Whenever a conductor cuts magnetic flux, an emt is induced in that conductor Above statement is due to

Faraday's law

A 60 Hz frequency would cause an electric light to

turn on and off 60 times per second

In the left hand rule, thumbs always represent

Direction of force on conductor

How can inductance of the coil can be increased?

By increasing the number of turns

One coulomb charge equal the charge on

6.24×10^18 electrons

The electrical energy required to heat a bucket of water to a certain temperature is 4kWh. If the heat losses are 20 percent, the energy input is

5 kWh

In gases flow of current is due to

electrons positive ions and negative tons

The maximum current rating for a 10k0, 0.5 W resistor is

7.07 mA

Copper wire of certain length and resistance is drawn out to three times its length without change in volume the new resistance of wire becomes

9 times

Two lamps 100 W and 40 W are connected in series across 230 V (alternating). Which of the following staternerit is correct?

40 W lamp will glow brighter

In an electric kettle water boils in 10 minutes. It is required to boil the boiler in 15 minutes, using same supply mains

length of heating element should be increased

An electrical lamp consumes 100W of power. If the supply voltage is 220V the energy consumed in 30 minutes is

0.05 kWh

The S.I. unit of power is

watt

Electric pressure is also called

voltage

The substances which have a large number of free electrons and offer a low resistance are called

conductors

Out of the following which is not poor conductor?

Copper

Out of the following which is an insulating material?

Paper

The property of a conductor due to which it passes current is called

conductance

Conductance is reciprocal of

resistance

The resistance of a conductor varies inversely as

area of cross section

With rise in temperature the resistance of pure metals

increases

Three resistances of 10 ohms, 15 ohms and 30 ohms are connected I parallel The total resistance of the combination is

5 ohms

The resistance of two wires is 250 when connected in series and 60 when joined in parallel. The resistance of each wire is

10Ω, 15Ω

An instrument which detects electric current is known as

galvometer

In a circuit a 33 resistor carries a current of 2 A, the voltage across the resistor is

66V

A light bulb draws 300 mA when the voltage across it is 240 V. the resistance of light is

800 ohms

The resistance of a parallel circuit consisting of two ohms, branches is 12 ohms. If the resistance of one is 18 ohms what is the resistance of the other

36 ohms

Four wires of same material, the same cross-sectional area and the same length when parallel give a resistance of 0.25 0. If the same four wires are connected is series the effective resistance will be

4 ohm

A current of 16 amperes divides between two branches in parallel of resistance 8 ohms and respectively. The current in each branch is

6.4 A, 9.6 A

Which of the following material has nearly zero temperature co-efficient of resistance?

Manganin

You have to replace 1500 resistor in radio. You have no 1500 Q resistor but have several 1000 ones which you would connect

two in parallel and one series

Two resistors are said to be connected in series when

same current passes in turn through both

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

power are additive

Which of the following materials has a negative temperature co-efficient of resistance

Carbon

Ohm's law is not applicable to

Vacuum tubes

Kirchhoff's current law states that

algebraic sum of the currents meeting at the junction is zero

According to Kirchhoff's voltage law, the algebraic sum of all IR drops and e.m.fs. in any dosed loop of a network is always

zero

The concept on which Superposition theorem is based is

linearity

thevenin resistance Rs is found

between same open terminals as for Eth

Maximum power output is obtained from a network when the load resistance is equal to the output resistance of the network as seen from the tarminals of the loved. The above staternent is associated with

Maximum power transfer theorem

"Any number is the parallel combination of current sources in parallel may be replace by a single current source whose current is the algebraic sum of individual source currents and source resistance is the parallel combination of individual source resistances. The above statement is associated with

Millman's thoerem

In any linear bilateral networks, if a source of ent E in any tranch produces a current / in any other branch then same emt acting in second branch would produce the same current / in the first branch. The above statement is associated with

reciprocity theorem

In than one sources any network containing more number of individual fictitious cuarents (the number being equal to the number of sources of emf each of of emf the current in any branch is the algebraic sum which is due to separate action of each source of emt, taken in order, when the remaining sources of emf are replaced by conductors, the resistances of which are equal to the internal resistances of the respective sources The above statement is associated with

Superposition theorem

In a delta network each element has value R. The value of each element in equivalent ster network will be

R/3

If the circuit does not contain any source of energy or emf it is known as

passive network

The arcuit has resisters, capacitors and semi-conductor diodes. The circuit will be known as

non-linear circuit

A star circult has element of resistance R/2. The equivalent detta elements will be

3/2 R

The force between two charges is 120 N. If the distance between the charges is doubled, the force will be

30 N

The electric field intensity at a point situated 4 meters from a point charge is 200 NIC. If the distance is reduced to 2 meters, the field intensity will be

800 N/C

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

Thickness od the plates

Three capacitors each of the capacity C are given. The resultant capacity 2/3 C can be obtained by using them

two in series and third parallel across this combination

A capecitor charge to 200 V has 2000 C of charge. The value of capacitance will be

10 uF

The area of plates of the parallel plate capacitor, to obtain capacity of 0.3 x 10 µF if they are separated by a distance of 10 mm and a dielectric between them of permittivity 2.5, will be

0.135 m^2

The capecitance C charge through a resistance R. The time constant of charging circuit is given

A material which is slightly repelled by a magnetic field is known as

diamagnetic material

Fleming's left hand rule is used to find

direction of force on a current carrying conductor in a misignetic field

Conductivity is analogous to

permeability

Both the number of tums is the core lengths of an inductive coil are doubled. Its self-inductance will be

doubled

The core of a coil has a length of 200 mm, the inductance of coil is 6 mH. If the core length is doubled, all other quantities, remaining the same, the inductance will be

3 mH

The self-inductances of two coils are 8 mH and 18 mH. If the co-efficient of coupling is 0.5, the mutual Inductance of the coil is

6 mH

Two coils have inductances of 8 mH and 18 mH and a co efficient of coupling is 0.5 the mutal connected in series aiding the total inductance will be

38 mH

A conductor 2 meters long moves at right angles to a magnetic field of flux density 1 tesla with a velocity of 12.5 m/s. The induced emf in the conductor will be

25 V

Lenz's law is a consequence of the law of conservation of

energy

A 1m conductor carries 125 amperes of current under 60° to a magnetic field of 1.1 testa. The force on the conductor will be nearly

120 N

Find the force acting on a conductor 3m long carrying a current of 50 amperes at right angles to a magnetic field having a flux density of 0.67 tesla.

100 N

A sine wave of voltage varies from zero to maximum of 200 V. How much is the voltage at the instant of 30° of the cycle?

100 V

How much rms current does a 300 W, 200 V bulb take from the 200 V, 50 Hz power line?

1.5 A

The time constant of the capacitance circuit is defined as the time during which voltage

rises to 63.2% of its final steady value

In the case of an unsymmetrical alternating current the average value must always be taken over

the whole cycle

In a pure resistive circuit

current is in phase with the voltage

If a sinusoidal wave has frequency of 50 Hz with 30 A rms current which of the following equation represents this wave?

42.42 sin 314t

The least number of 1- watt-meters required to measure total power consumed by an unbalanced load fed from a 3-4, 4-wire system is

In a three-phase supply floating neutral is undesirable because it way give rise to

unequal line voltage across the load

On a 3-phase balanced delta-connected load supplied a 240 V AC, the two watt-meter readings 1210 What is the current?

13.39 A

Two watt meter connected to measure the power input to a balanced 3-phase indicate 2500 W and 500 W respectively. What is the power factor?

0.655

A balanced star connected loas is supplied from a symnetrical three phase 440 V system. it draws current of 40 A at 0.866 power factor lagging. The local power taken by the load will be

26.4 kW

A series RL-C orcuit draws current at leading power factor at

less than resonant frequency

In a star connected system, the line current is

equal to the current

Two wattmeter can be used to measure 3 phase power for a

balanced and unbalanced load

in 2-wattmeter mathod, the reading in one of the wattimeter is zero when

power factor is 0.5

For the series RLC circuit at resonance the current amplitude is, for a fixed voltage amplitude and power factor is

maximum, unity

In an RLC circuits, the impedance at resonance is

zero

In the balanced three-phase circuit, Loed draws 1 80 KW and 60 leading kVar Load 2 draws 120 kW and 100 c=\Box lagging kVer. The Ine voltage of the system is 1000 volts. Find the line current at the generator terminals by adding the line currents of the two loads,

129 A

Given the following phase currents, la 35+j35, Ib=3 and ic-26-11.6 Determine the negative sequence current for phase B.

0.272 + j0.649

Three resistance R1, R2, and R3 are connected in series across 120V do source. If R1 is 60 ohms, R2 had 40 volts with 05 A current. Find R3

100 ohms

A 300 copper conductor has a resistance of 250 ohms. What is the size of conductor?

0.162 mm

What is the Value of a nesator with color code Red, Red Orange, Silver

22 kilo ohms

A wire 100 cm long and carrying current of 40 A is in perpendicular whose magnetic flux density is 1.5 Wb/m^2. Calculate the mechanical power which has velocity of 100 Watts 5 m/s

300 watts

A series RC circuit is connected a capacitor and resistor having a voltage of 60V and 80V. What is the total voltage of the circuit

100 volts

A resistance R and inductive reactance X are connected in parallel across 2.4 kV rms power factor. Find the value of R in ohms

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