AP23 - EEBE

The primary of a 3:1 step-Up transformer is connected to & source and the secondary is connectedto&resistor R. The power dissipated by R in this situation is P. If R is connected directly to the sourceit will dissipate a power of:

• P/9

• P/3

• P

• 3P

An LC Circuit Has An Oscillation Frequency Of105 Hz. If C = 0.1 ΜF, Then L Must be About:

• 1mH

• 10mH

• . 2.5uF

• 25uF

A single circuit 745 kV, 60 Hz three-phase transposed transmission line is composed of four ACSR 1, 272, 000 cmils, 54/19. Pheasant conductors per phase with horizontal configuration. The phase spacing between the line center of the bundles is 14 m and the bundle spacing is 45 cm. The conductors have a diameter of 1.382 inch and a GMR of 0.5592 inch. Determine the capacitance per phase per km of the transmission line in microfarad per kilometer.

• 0.01424

• 0.01266

• . 0.01583

• 0.01234

What is the maximum power that can be transmitted over a three-phase short transmission line having a per phase impedance of 0.3 + �0.4 Ω if the receiving end voltage is 6, 351 volts per phase and the voltage regulation is not to exceed 5 percent?

• 103.5 MW

• 114.4 MW

• 108.9 MW

• 105.6 MW

A certain amount of fuel contains 17x10 10 Btu of energy. What is the corresponding energy inGigacalories?

• 47.3

• 49.4

• 45.5

• 42.8

The line currents in a three-phase, four-wire system are Ia = 30 + j40, Ib = 20 + j20 and Ic =- 40 – j20 A, respectively. What is the negative sequence current for phase A in Ampere?

• -25 + j4

• 25 + j4

• 25 – j4

• -25 – j4

A light source located 2.75 m from a surface produces an illumination of 528 lux on that surface. Find the illumination if the distance is changed to 1.55 m.

• 298 lux

• 1,662 lux

• 937 lux

• 168 lux

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

• . 43.3

• 50

• 57.7

• 34.4

A circular top is located 4m below and 3m to the left of a lamp that emits 2000 lumens. .What illumination is provided on the surface of the table?

• 4.58 lux

• 5.35 lux

• 5.09 lux

• 4.84 lux

What is the IEEE number the device name AC TIME OverCurrent Relay

• 21

• 51

• 67

• 50