Electrical Engineering

29問 • 2年前

問題一覧

As a loop of wire with a resistance of 90 ohm moves in a constant non-uniform magnetic field, it loses kinetic energy at a uniform rate of 4.0 mJ/s. Determine the induced current in the loop;

20 mA

One primary and one secondary terminal of a two-winding transformer are connected to an ohm-meter instrument. What will be the reading on this instrument?

infinity

A" car battery is rated at 80 ampere-hour. An ampere-hour is a unit of

charge

GMC was created by the Energy Regulatory Commission to monitor the compliance of the users of the Grid to the PGC. What does the GMC stands for?

Grid Management Committee

Increasing the voltage of the transmission system to double of its original value with the same power to be transmitted, the new power losses o f the transmission system will be of the original value.

one-fourth

The line currents in a three-phase, four-wire system are la =30 +; 40, Ib =20 +j 20 and Ic =-40 - j20 A, respectively. What is the negative sequence current for phase Ain Ampere?

25 - j4

The resistance of the primary coil o f a well-designed 1:10 step-down transformer is 1 ohm. With the secondary circuit open, the primary si connected to 12 V as generator what is the primary current. B. D.

Essentially zero

A" 120-V power line is protected by a 15-A fuse. What is the maximum number of "920V, 500W" light bulbs that can be operated at full brightness from this line?

Which of the following protective relay/s operates on the principle of the Kirchhoff's Current Law?

Differential Relay

Which of the following has the greatest effeet in decreasing the oseillation frequency of an LC circuit? Using instead ____

2L and 2C

The illumination of a surface 3.40 mdirectly below a light source is 25 lux. Find the intensity of the light source?

289 cd

Guy wire is used in the construction of distribution lines for what purfose?

supporting the pole

Two equal charges of opposite signs are separated by a horizontal distance of 7 0 mm. If the resultant electrie field at the midpoint of the line is 4 × 104 N/C. What is the magnitude of each charge?

2.7 nC

A 2-T uniform magnetic field makes an angle of 300 with the z axis. The magnetic flux through a 3-m? portion of the xy plane is

5.2

Which of the following statement is CORRECT concerning electrie field?

Electric field lines are elose together where the field is large

All grounding connections are made and electrically

permanent, continuous

The size of the sole connection of a grounding electrode conductor connected to a concrete-encased electro shall not be required to be which of the following

Larger than 22 mm^2

If a tropical storm is going to the Philippine Area of Responsibility (PAR) within 24 hours, what type of alert is to be raised in accordance to the Philippine Grid Code?

Blue Alert

Which of the following wil you connect to make a galvanometer into an ammeter?

A low resistance in parallel

Calculate the inductance in mil required to resonate at 9.0 MHz with a capacitance of 90 picofarad.

2.53

A" two-winding transformer has core-losses and full-load copper losses equal t o W watts each. It is tested along with another similar transformer for back-to-back test. What is the total power input will be in W?

Four

Four wires meet at a junction. The first carries 4 A into the junction, the second carries 5 A out of the junction, and the third carries 2 A out of the junction. The fourth carries into _____ the junction.

3 A into

The customer is only charged or credited as the case may be, for the difference between the electricity supplied by the Distribution Utility and electricity it supplies to the Distribution Utility when the times it has excess VRE generation both of which are metered using either 2 unidirectional meters, one for import and one for export, or a single bidirectional meter. What do you call this scheme?

Net Metering

A motor generally used in toys is

shaded pole

What is the instrument often used to check the degree of motor shaft misalignment?

dial indicator

If the potential difference across a resistor is doubled only

the current is doubled

The power loss is MORE consider in the desigh of

the transmission line

Nine identical wires, each of diameter d and length L, are connected in parallel. The combination has the same resistance as a single similar wire of length L but whose diameter is:

'In an RLC series eircuit, the source voltage is leading the current at a given frequency f. If f is lowered slightly, then the circuit impedance will:

decrease

Math

Ashley Calica · 10問 · 2年前

Math