In the left-hand rule, thumb always represents direction of the ________.

Three capacitances C₁= 6 µF, C₂ = 7 µF and C3 = 18 µF are connected in series across a 120 v supply. Find the voltage across C2.

A balanced delta connected load has impedances Z₁ = Z₂ = Z₃. What is the per phase equivalent impedance in wye?

The net reactance in an RCL circuit is

What is the largest rated room air conditioner unit that may he attached to a 20-ampere branch circuit that also serves other receptacles?

A 60-Hz short transmission line, having R = 0.62 ohms per phase and L = 93.24 mH per phase, supplies a three-phase, wye-connected 100 MW load of 0.90 lagging power factor at 230 kV line-to-line voltage. Determine the voltage regulation of the transmission line?

One-way communications is called

In two-wattmeter method of power measurement, the readings of the two wattmeters were

6,717 watts and 2,658 watts, respectively. Find the power factor.

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

Transmission voltage level of 1,000 kV is categorized as

A medium unshaded lamp haungs 8 m directly above the table, To what distance should it be lowered to 20 increase the illumination to 2 times its former value?

Electric field lines:

A 200-N/C electric field is in the positive x direction. The force on an electron in this field is:

A lamp produces an initial illumination of 800 lux over a normally placed screen. If the distance of the lamp from the screen is doubled, what is the new illumination on the screen?

In which type of faults given below, all the 3 components la_o, la₁, and la₂ are equal?

A certain wire has resistance R. Another wire, of the same material, has half the length and half the diameter of the first wire. The resistance of the second wire is:

What is the minimum ampacity of branch circuit conductor for a hermetic motor whose full- load current is 20 A?

A sinusoidal voltage V(t) has an rms value of 100 V. Its maximum value is:

Two capacitors C₁ = 50 µF and C₂ = 30 µF are connected in series. Find the equivalent capacitance in µF.

A magnetizing force of 1,000 AT/m will produce a flux density of ______ in air.

If copper loss of a transformer at 7/8th of full-load is 4,900 W, then what is its full-load

copper loss?

A series RLC circuit consists of 20 ohms resistance, 0.2 H inductance and an unknown capacitance. What is the value of the capacitance if the circuit has a leading angle of 45° at

60 HZ?

A 3-phase circuit 60 HZ, 230 kV transposed transmission line is composed of two 1,272 MCM 54/19 conductors per phase with horizontal configuration. The bundle conductors are 50 cm in distance while phase spacing between the centers of the bundle is 10 meters. If the GMR of the ACSR conductors is 0.0466 ft., find the inductive reactance in ohm/km/phase of the transmission line?

Two single phase transformers each rated 75 kVA are connected in V or open-delta to serve a three phase load of 120 kW at 0.00 power factor lagging. Το μιάvent the over loading of transformers, determine the size of the capacitor in kVAR.

Which is not a characteristic of an ideal transformer?

What is the IEEE device function number 50?

A transformer has negligible resistance and a p.u. reactance of 0.1. What is its voltage. regulation on full load with a leading p.f. angle of 30°?

Transformer breaths in when

The color reserved for use in equipment grounding conductor is

An ideal step-up transformer with a power factor of 1.0 is used between a 120 Vrms supply and 10 resistor with the supply at the primary. The turns ratio is 70. What is most nearly the average power dissipated due to resistance R?

A system operates at 220 KVA and 11 kV. Using these quantities as base values, find the base current for the system.

For an existing a.c. transmission line the string efficiency is 80%. Now if dc. voltage is supplied for the same set up, the string efficiency will be:

The inductance per unit length of an overhead line due to internal flux linkages

High permittivity ceramic is used for capacitors of

A certain amount of fuel contains 17 x 10¹⁰ BTU of energy. What is the corresponding energy in Gigacalories?

If a tropical storm is going to The Philippine Area of Responsibility (PAR) within 2 hours, what type of alert is to be raised in accordance to the Philippine Grid Code?

What is the quality factor Q of an RLC series circuit having R = 5 $$\Omega$$ , L = 10 mH, and C = 100 μF?

A certain copper wire has a resistance of 25 ohms at 10°C. Take the temperature coefficient at 10°C to be a 0.00405°C-1, What must be the maximum operating temperature of the wire if its resistance is to increase by at most 20%?

For any circuit the number of independent equations containing emf's, resistances, and currents equals the number of _______.

Which of the following types of fault uses only the equivalent positive impedance of the circuit in the short-circuit calculation?

A washing machine is, in effect, an R-L circuit. If the machine takes 311 W and 4.5 A from a 155-V source when operating normally. Find its power factor. Troubleshoot:

Which of the following define the meaning of load factor?

Approximately how far away must an isolated positive point charge of 1 x 10^(-8) C be in order for it to produce an electric potential of 100 V? The charge is in free space with e = 8.85 x 10^(-12) C^2/N*m^2.

What is the maximum speed at which a 60 Hz synchronous machine can be operated?

Three single-phase transformers rated 25 kVA each are connected in delta delta to supply a balanced load of 75 kVA. One transformer is removed for repair, what is the kVA of each remaining transformer?

The rotor of a 3-phase, 60 Hz, 4-pole inductor motor takes 120 kW at 3 Hz. What is the I induction motor?

rotor speed of the I induction motor?

The per phase line loss in a 40 km long transmission line is NOT to exceed 60 kW while it is delivering 100 A per phase. If the resistivity of the conductor material is 1.72 x 10-8 ohm-meter, determine the required conductor diameter.

Two 1 10-V light bulbs, one "25" and the other "IOOW", are connected in series to a 110 V source. Then, which of the following statement is correct with regard to above sentence?

The growth rate of the energy consumption in our country is 6.9%. In how many years will the energy be quadrupled?

A single-phase, 10-km transmission line has 16.65 mH total inductance. If the distance between the conductors is 1 m, what is the conductor radius?

A 2-henry inductor has 120 turns. How many turns must be added to raise its inductance to 3 henry?

An inductor has a value of 44 mH at 60 Hz. What is the inductive susceptance stated as an imaginary number?

The commonly used light sensor in a modern fax machine is the _________.

A collision avoidance radar is designed to detect the presence of vehicles up to a range of 0.50 km. What is the maximum pulse repetition frequency, PRF?

A small wind generator is designed to generate 50 kW of power at a wind velocity of 25 miles per hour. What is the approximate blade diameter?

Three-phase transformers which cannot be connected in parallel are

A 10-km long, single phase short transmission line has 0.5L600 Q/km impedance. The line supplies a 316.8-kW load at 0.8 power factor lagging. What is the voltage regulation if the receiving end voltage is 3.3 kV?

A generating station has a maximum demand of 1000 MW. The annual load factor is 75% and plant capacity factor is 60%. The reserve capacity is

A substance that changes its electrical resistance When illuminated by light is called:

To adjust the power of the alternator, adjust the ______.

In a series RC circuit, the voltage across the capacitor and the resistor are 60 v and 80 v respectively. What is the total voltage of the circuit?

A generator delivers a load through a pair of wires, each of which has a resistance of 0.06 ohm. If the lond voltage and power are 120 v and 4.8 kW, respective what is the generated voltage?

In a 4-pole, 60 Hz. 200v induction motor having a full-load current of 350 A, torque developed is 700 N-m. What is the approximate speed of the motor?

Three resistances of 4, 9, and 11 ohms are connected in series and then in parallel. Find the effective resistance for series connection.

A washing machine is, in effect, an KL circuit. If the machine takes 311 Wand 4.5 A form a 115-v source when operating normally. Find its power factor.

An induction motor draws 50 kW ai a 0.60 lagging power factor from a 480 v, 60 Hz source. What parallel capacitor will increase the overall power factor to 0.90 lagging?

When the voltage remains the same, the current will. as the impedance decreases.

I. decrease II. increase

When electrons build up p sure at one point. it is called _______.

Which of the following type of fault used sequence impedance of the circuit in the only the equivalent positive and negative short-circuit calculation?

A 69 KV three-phase transposed line is composed of one ACSR 336,400 cmil, 26/7 Linnet conductor per phase with a horizontal configuration of D, 5 ft. 023 5 ft and 0,3 = 10 ft. The conductors have a diameter of 0.721 inch an the inductance per phase per kilometer of the line. GMR of 0.0243 ft. Find the inductance per phase per kilometer of the line.

Based on the Philippine Distribution Code, all users of the distribution system must maintain a certain power factor at the connection point in order to maintain power quality in the system. What power facior should be maintained at the connection point?

The purpose of insulating oil when used on power circuit breaker are the following, EXCEPT:

What is the total flux emitted of four lamps having an

What is the Thevenin's equivalent reactance of a certain electric system rated 20 MVA at 34.5 KV if the available short circuit MVA is 950?

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

Two wattmeters both have readings of 5 kW when connected for the two-wattmeter method in a 480-v three-phase circuit that has a balanced $$\Delta$$ load. Find the A phase impedance.

Which of the following cannot have a single unit of 100 MW?

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

Which of the following tests are conducted for transformer oil?

I. dielectric

II. interfacial tension

III. color of oil

IV. neutralization number

V. power factor

VI. specific gravity

RA 7832 concerns on

Three resistors A, B, and Care connected in series to a 120-v supply. If the resistor A = 6U ohms and the voltage across resistor B = 40 v when the current is 1/2 A, what is the resistance of resistor C in ohms?

Open circuit test on transformers is conducted to determine

PDC in EPIRA means

Three resistances of 4, 9 and 11 ohms are effective resistance for connected in series and then in parallel. Find the series connection.

One KW is equal to ______ gram-cal/sec.

Voltage resonance means

Calculate the force developed per meter length between two current carrying conductors 10

cm apart and carrying 1,000 A and 1,500 A currents respectively.

A barrier voltage at a PN junction for germanium is about ________.

A 34.5 kV feeder line is 5 miles long. The conductors are spaced 4-feet horizontally. If the inductive reactance of the line is 3.46 ohms per phase, what is the self GMD of each conductor?

In the left handle, thumb always represents direction of the __________.

Three 3-ohm resistors are connected in parallel. This combination is then placed in series. with another 3-ohm resistor. What is the equivalent resistance in ohm?

Copper loss of a transformer are determined by means of a/an______ test.

What is/are the main reason's for using high voltage in the transmission of power in the grid system?

I. to transmit bulk power with minimum line losses

II. Increase system reliability

In which type of electronic communications does the information travel in two directions?

A 4 pole de motor with armature winding resistance of 0.6 ohm receives a supply of 230 volt. If the back emf produced during running condition is equal to 210 volt. Calculate the electric current flowing through the armature at two point.

A shunt generator supplies a full-load current of 100 A at 110 V. The shunt field resistance is 55 2 and stray losses are 500 W. If the machine efficiency at full-load is 86%, calculate the armature resistance.

KCL works on the principle of which of the following

A drawn wire of resistance 5 12 is further drawn so that its diameter becomes one-iith. Its resistance will now be (volume remaining the same)

Sumpner's test is conducted on transformers to determine