EE

65問 • 1年前

Almeda, Abegail S.

通報

問題一覧

The class C calculation can withstand

180 degree

in the transformer

High tension winding is used near the core

Two transmission lines of the surge impedance of 600 ohms each is linked by a cable. What should be the surge impedance of the cable if there were no reflection at the junction?

600 ohms

For 11 KV underground system, it is possible to work upon a length of

100 miles

Series capacitors are used to

Compensate for line inductive reactance

For a detection of the occurrence of the severe synchronising power surges

Mho relays are best suited

If the height of the transmission tower is decreased, the capacitance of the line will

increase

If the capacitance of the transmission line is increased, the transmitted power will

increase

Which of the following method may be used to inject reactive power in the transmission line?

shunt capacitor

The most common generation voltages in India are

11 KV, 13.2 KV, 18 KVI

The most common transmission voltages in India are

66 KV, 132 KV, 220 KV

Generally the porcelain insulators are glazed because

it prevents the absorbing tendency of gases and water vapours

Up to which volatge of pin insulators are preferred?

25 KV

Name the effect which is resulted because of the size of conductor, frequency and the specific resistance of the conducting material

Skin effect

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

decreasing

the capacitors bank is installed

To improve the power factor and voltage magnitude

the safe working life of the underground cable is taken as

40 yrs

The overall efficieny of thermal power plant is low due to low efficiency of

steam turbine and condenser

In practice, the cost of energy transmission is minimum for

steam power plants

The peak load demand of an industrial area is met by

diesel power plant

The main objective of tariff is to distribute equatibly the cost of

D. supplying energy among various classifications of use.

factors that affect tariff

All of these

The surge impedance of a transmission line differs from its characteristic impedance, as surge impedance considers line

resistance of finite value

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

intermediate points

Long transmission line has a surge impedance of appriximately

400 ohms

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

Volatge gradient in a conductor is highestat its

surface

Voltage gradient in a cable is highest at the

surface of the conductor

The sag of the transmission lune is affected by

both A and B

A conductor has seven identical strands of r = 1 cm each. The GMR of the conductor is

2.177 cm

An ACSR conductor has (n-1) layers around its single centre strand, the total number of strands will be

3n^2 - 3n + 1

An ACSR conductor has seven steel strands, it is surrounded by twenty four aluminium conductors, it is specified as

24/7 ACSR

The value of inductance per conductor in three phase line is ... times the loop inductance for single phase lines

1/2

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

balance to three phases of the circuit

In EHV lines, the high voltage gradient at the conductors is reduced by

two or more conductors per phase in close proximity and increasing the spacing between the phases

The transmission line inductance contributed by

the current in other conductors

Regulating transformers are used in power system to control

load flow

The ratio of capacitance of line to neutral and line to line capacitance of a transmission line having two conductors is

2.0

The rise of temperature in transmission line

decrease the stress and increase the length

The skin effect in conductors is due to non-uniform distribution of current in it and major portion of the current is near the ... of the conductor.

surface

The effective resistance of conductor is increased by

both A and B

101. A medium transmission line has length over 80 Km and upto 250 Km has negligible

coductance

The characteristic impedance of a loss-less overhead line has a value of

400 to 600 ohms

The characteristic impedance of a loss-less cable is

40 to 60 ohms

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

C. more than to that at the sending end

At nonload, the loss in a long transmission line is

1/3 RI^2

In terms of ABCD constants, the characteristic impedance of overhead transmission is

(AB/CD)^1/2

The units of B and C are respectively

ohm, mho

A long transmission line has value of its A constant as

zero

When two lines having constants A1,B2, C1, D1, and A2, B2, C2, D2, are cascaded in series, the resultant value of A constant will be

A1A2 + B1C2

The cause of transient stabilty is

all of these

corona always causes

radio interference

Corona loss is more

unstranded conductor

Load that depends on the supply frequency is of

centrifugal pumps

The inertia constants of two machines are respectively 30 and 42 MJ per MVA. When the change in frequency due to change in load in first machine is 12 Hz, the change in the second machine frequency will be

10 Hz

For cost and safety, the outdoor substations are installed for voltages above

33 KV

Lamp flicker in secondary distribution system is controlled by

C. A and B both

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

synchronous reactance

Maximum SC current occurs due to

dead short circuit

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

c. either (a) or (b)

Wave trap is used to trap waves of

(a) bigher frequencies entering generator on transformers units

For 400 KV system, the capacity of lightning arrester is

10 KA

The gap length of rod type surge diverter used for 132 KV line should be

65 cm

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

1.0

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Almeda, Abegail S. · 100問 · 1年前

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100問 • 1年前

Almeda, Abegail S.

Almeda, Abegail S. · 99問 · 1年前

99問 • 1年前

Almeda, Abegail S.

問題一覧

The class C calculation can withstand

180 degree

in the transformer

High tension winding is used near the core

Two transmission lines of the surge impedance of 600 ohms each is linked by a cable. What should be the surge impedance of the cable if there were no reflection at the junction?

600 ohms

For 11 KV underground system, it is possible to work upon a length of

100 miles

Series capacitors are used to

Compensate for line inductive reactance

For a detection of the occurrence of the severe synchronising power surges

Mho relays are best suited

If the height of the transmission tower is decreased, the capacitance of the line will

increase

If the capacitance of the transmission line is increased, the transmitted power will

increase

Which of the following method may be used to inject reactive power in the transmission line?

shunt capacitor

The most common generation voltages in India are

11 KV, 13.2 KV, 18 KVI

The most common transmission voltages in India are

66 KV, 132 KV, 220 KV

Generally the porcelain insulators are glazed because

it prevents the absorbing tendency of gases and water vapours

Up to which volatge of pin insulators are preferred?

25 KV

Name the effect which is resulted because of the size of conductor, frequency and the specific resistance of the conducting material

Skin effect

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

decreasing

the capacitors bank is installed

To improve the power factor and voltage magnitude

the safe working life of the underground cable is taken as

40 yrs

The overall efficieny of thermal power plant is low due to low efficiency of

steam turbine and condenser

In practice, the cost of energy transmission is minimum for

steam power plants

The peak load demand of an industrial area is met by

diesel power plant

The main objective of tariff is to distribute equatibly the cost of

D. supplying energy among various classifications of use.

factors that affect tariff

All of these

The surge impedance of a transmission line differs from its characteristic impedance, as surge impedance considers line

resistance of finite value

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

intermediate points

Long transmission line has a surge impedance of appriximately

400 ohms

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

Volatge gradient in a conductor is highestat its

surface

Voltage gradient in a cable is highest at the

surface of the conductor

The sag of the transmission lune is affected by

both A and B

A conductor has seven identical strands of r = 1 cm each. The GMR of the conductor is

2.177 cm

An ACSR conductor has (n-1) layers around its single centre strand, the total number of strands will be

3n^2 - 3n + 1

An ACSR conductor has seven steel strands, it is surrounded by twenty four aluminium conductors, it is specified as

24/7 ACSR

The value of inductance per conductor in three phase line is ... times the loop inductance for single phase lines

1/2

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

balance to three phases of the circuit

In EHV lines, the high voltage gradient at the conductors is reduced by

two or more conductors per phase in close proximity and increasing the spacing between the phases

The transmission line inductance contributed by

the current in other conductors

Regulating transformers are used in power system to control

load flow

The ratio of capacitance of line to neutral and line to line capacitance of a transmission line having two conductors is

2.0

The rise of temperature in transmission line

decrease the stress and increase the length

The skin effect in conductors is due to non-uniform distribution of current in it and major portion of the current is near the ... of the conductor.

surface

The effective resistance of conductor is increased by

both A and B

101. A medium transmission line has length over 80 Km and upto 250 Km has negligible

coductance

The characteristic impedance of a loss-less overhead line has a value of

400 to 600 ohms

The characteristic impedance of a loss-less cable is

40 to 60 ohms

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

C. more than to that at the sending end

At nonload, the loss in a long transmission line is

1/3 RI^2

In terms of ABCD constants, the characteristic impedance of overhead transmission is

(AB/CD)^1/2

The units of B and C are respectively

ohm, mho

A long transmission line has value of its A constant as

zero

When two lines having constants A1,B2, C1, D1, and A2, B2, C2, D2, are cascaded in series, the resultant value of A constant will be

A1A2 + B1C2

The cause of transient stabilty is

all of these

corona always causes

radio interference

Corona loss is more

unstranded conductor

Load that depends on the supply frequency is of

centrifugal pumps

10 Hz

For cost and safety, the outdoor substations are installed for voltages above

33 KV

Lamp flicker in secondary distribution system is controlled by

C. A and B both

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

synchronous reactance

Maximum SC current occurs due to

dead short circuit

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

c. either (a) or (b)

Wave trap is used to trap waves of

(a) bigher frequencies entering generator on transformers units

For 400 KV system, the capacity of lightning arrester is

10 KA

The gap length of rod type surge diverter used for 132 KV line should be

65 cm

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

1.0