EE MODULE 2.2

premopremo remo · 75問 · 2年前

通報

問題一覧

The load must not be connected directly on

transmission line

The lighting arrester is installed

at the top of the building

Incase of pin type insulators, the petticoats are provided to

to drip out the rain water and to increase the possible conducting length of the path

If the specific resistance of the conductor is increased, what effect does it result on the skin effect?

decreasing

The capacitor bank is installed

to improve the power factor and voltage magnitude

Pole mounting substations are also known as

outdoor type

A circuit breaker serves the purpose of

all of the above

As compared to steam stations, hydro-power station have

C. both A and B

In practice, the cost of energy transmission is minimum for

steam power plant

The peak load demand of an industrial area is met by

diesel power plant

Diversity factor is the

D. reciprocal of A

Demand factor for a domestic fan and refrigerator is approximately

0.75 and 1.0

The surge impedance of a transmission line differs from its characteristics impedance, as surge Impedance consider line

B. resistance of finite value

Booster transformers are used to increase the voltage at of a transmission line

intermediate points

The transfer of real power between interconnected stations is affected by

capacitance

Shunt conductance in power transmission lines is due to leakage over the

insulators

Voltage gradient in a cable is highest at the

surface of the conductor

The real part of propagation constant of a transmission line is

attenuation constant

For a span of length of 2l, horizontal tension at supports as 7 weight of the conductor per unit length is w the maximum value of sag will be

wl^2/2T

The sag of the transmission line is addected by

Both A and B

Most commonly used supports for high tension lines is

latticed steel poles

When horizontal tension H increases by 20%, the tension T changes by a

increase of 20%

A transmission line is a circuit with

A. distributed parameters of R, L, C and G

When the conductor of a three-phase circuit are not spaced equilaterally, the transposition is done to

C. balance the three phases of the circuit

The transmission line inductance contributed by

the current in ither conductor

Regulating transformers are used inpower system to control

load flow

When a wave propagate on a transmission line, it suffers reflection several times at

sending and other end

Advantages of grounding are

C. both A and B

When the fuel input to the prime mover of an alternator is increased, it increases its

power output

The generating station with mimimum running cost is

hydro power station

Power plant having the maixmum efficiency is

nuclear

Tappings in on-load tap changing transformer are provided on

HV side

The cost of the power generation will decrease when the load factor

increases

Water is used only for cooling purposes in

diesel power station

Turbo-alternators usually have

2 poles

Alternators installed in hydro power station, are of

medium speed

The protection from negative sequence currents is provided for

generators

The value of diversity factor is

greater than one

The turbine used for high head in hydro plant is

Pelton turbine

The per unit impedances of a transformer referred from the primary and secondary side

B. are equal

For load flow analysis transmission line are represented

nominal T

The bus bar of the power system, whose voltage magnitude and angle is not known, is called

load bus

The zero sequence current in & winding of Y/A transformer is found

if neutral point of Y winding is earthed

The zero sequence current will not flow in the

L-L fault

The presence of earth alters the

C. both A and B

A two terminal pair of network of a transmission line can be represented by a

C. either A and B

Ferranti effect states that the receiving end voltage on no load is

C. more than that at sending end

Advantages of constant voltage transmission are

All of the above

A transmission line has value of its A constant as

nearly equal unity

The cause of transient stability is

all of the above

Corona always causes

radio interference

Lamp flicker in secondary distribution system is controlled by

C. both A and B

Transient stability can be improved by the use of

D. all of the above

When a line to line fault occurs, the SC current of an alternator depends upon its

synchrounous reactance

Causes of faults in power system

all of these

The various power system faults can be arranged in the order of increasing severity is

L-G, L-L, L-L-G, L-L-L-G

The negative sequence component of a voltage is equal to

complex conjugate of positive sequence component

In circuit breakers, the arc is initiated by the process of

C. either A and B

At the open circuited end of a transmission line the reflection coefficient is

1.0

One conductor open in a three phase transmission line will develop

a parallel connection of sequence networks

The steady state stability limit of a two-machine system depends on

per unit reactance of the power system

A shunt fault is characterized by

increase in current reduction, frequency and p.f.

Most economic load on an overhead line is

greater than the natural load

The most economical load on an underground cable is

less than the surge loading

In subsequent iteration, a voltage-controlled bus is treated as a load bus when its

reactive power limit is violated

Voltage magnitude of a particular bus can be controlled by controlling the

B. reactive power of the bus

Convergeance of the transmission load flow is always assured in case of

D. both A and C

For the stable operation of interconnected system, the passive element that can be used as interconnecting elements is.

A. reactor

The positive sequence component of the voltage at the point of fault is zero when it is a

three phase fault

Load flow study is carried out for

system planning

The main consideration for higher operating voltage of transmission is to

C. Increase power transfer capability

If the effect of earth is taken into account, then the capacitance of line to ground

B. increases

For a Y-∆transformer Y-side grounded, the zero sequence current

exists in the line on the Y-side

If real power cemand is suddenly increased frequency of the system will

decrease

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