EE 3

25問 • 1年前

ユーザ名非公開

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問題一覧

If the applied voltage to a DC machine is 230 V, then what is the back emf for maximum power developed?

115 V

At what load condition a transformer will have zero efficiency?

At no-load.

Consider the following statements: 1. Resistor dissipates energy 2. Capacitor stores energy 3. Inductor dissipates energy Which of the above is/are correct?

1 and 2

In a dc 3-wire distribution system, balancer fields are cross-connected in order to ______.

equalize voltages on the positive and negative outers

A DC series motor drawing an armature current of Ia is operating under saturated magnetic conditions. The torque developed in the motor is proportional to:

The topmost conductor in a high transmission line is _______.

earth conductor

Two parallel shunt generators will divide the total load equally in proportion to their kilowatt output ratings only when they have the same ______.

both rated voltage and voltage regulation

In a network made up of linear resistors and ideal voltage sources, values of all resistors are doubled. Then the voltage across each resistor is:

Not changes

The hysteresis and eddy current losses in a dc machine running at 1000 rpm are 250 W and 100 W respectively. If the flux remains constant, at what speed will be the total iron losses be halved?

570 rpm

The capacitor charging current is:

An exponential decay function.

The nodal method of circuit analysis is based on:

KCL and Ohm`s law

If each branch of a Delta circuit has impedance (sqrt 3)Z, then each branch of equivalent Star-circuit has impedance

Z/(sqrt 3)

Kirchhoff’s current law is valid for:

Both DC and AC circuits

In Kando system of track electrification, ______ is converted into _______.

1-phase ac, 3-phase dc

The wooden poles well impregnated with creosite oil or any preservative compound have life ______.

25 to 30 years

Shunt generators are most suited for stable parallel operation because of their voltage characteristics. Which one?

Dropping

Transmission line insulators are made of ______.

Porcelain

The presence of ozone due to corona is harmful because it _______.

corrodes the material

For an overhead line, the surge impedance is taken as ______.

100 to 200 ohms

Which of the following system is not generally used?

1-phase 4 wire

In a dc 3-wire distributor using balancers and having unequal loads on the two sides:

Balancer connected to lightly-loaded sides runs as a motor

A feeder, in a transmission system, feeds power to ______.

distributors

For the voltage build-up of a self-excited dc generator, which of the following is not an essential condition?

Total field circuit resistance must be less than the critical value

What is the effect on current flow in reversing the direction of movement of a conductor in the magnetic field of a generator?

Reverse the direction of the current flow.

The number of address lines required to address a memory of size 32 K is _____ lines.

EE 2

EE 2

ESAS

ユーザ名非公開 · 3回閲覧 · 100問 · 1年前

ESAS

ESAS 2

ESAS 2

ESAS 3

ESAS 3

EE Laws

EE Laws

問題一覧

If the applied voltage to a DC machine is 230 V, then what is the back emf for maximum power developed?

115 V

At what load condition a transformer will have zero efficiency?

At no-load.

Consider the following statements: 1. Resistor dissipates energy 2. Capacitor stores energy 3. Inductor dissipates energy Which of the above is/are correct?

1 and 2

In a dc 3-wire distribution system, balancer fields are cross-connected in order to ______.

equalize voltages on the positive and negative outers

A DC series motor drawing an armature current of Ia is operating under saturated magnetic conditions. The torque developed in the motor is proportional to:

The topmost conductor in a high transmission line is _______.

earth conductor

Two parallel shunt generators will divide the total load equally in proportion to their kilowatt output ratings only when they have the same ______.

both rated voltage and voltage regulation

In a network made up of linear resistors and ideal voltage sources, values of all resistors are doubled. Then the voltage across each resistor is:

Not changes

The hysteresis and eddy current losses in a dc machine running at 1000 rpm are 250 W and 100 W respectively. If the flux remains constant, at what speed will be the total iron losses be halved?

570 rpm

The capacitor charging current is:

An exponential decay function.

The nodal method of circuit analysis is based on:

KCL and Ohm`s law

If each branch of a Delta circuit has impedance (sqrt 3)Z, then each branch of equivalent Star-circuit has impedance

Z/(sqrt 3)

Kirchhoff’s current law is valid for:

Both DC and AC circuits

In Kando system of track electrification, ______ is converted into _______.

1-phase ac, 3-phase dc

The wooden poles well impregnated with creosite oil or any preservative compound have life ______.

25 to 30 years

Shunt generators are most suited for stable parallel operation because of their voltage characteristics. Which one?

Dropping

Transmission line insulators are made of ______.

Porcelain

The presence of ozone due to corona is harmful because it _______.

corrodes the material

For an overhead line, the surge impedance is taken as ______.

100 to 200 ohms

Which of the following system is not generally used?

1-phase 4 wire

In a dc 3-wire distributor using balancers and having unequal loads on the two sides:

Balancer connected to lightly-loaded sides runs as a motor

A feeder, in a transmission system, feeds power to ______.

distributors

For the voltage build-up of a self-excited dc generator, which of the following is not an essential condition?

Total field circuit resistance must be less than the critical value

What is the effect on current flow in reversing the direction of movement of a conductor in the magnetic field of a generator?

Reverse the direction of the current flow.

The number of address lines required to address a memory of size 32 K is _____ lines.