**Description :** Express the following functions in cosine form

**Last Answer :** Express the following functions in cosine form

**Description :** How many volts does it take to power an Arduino?

**Last Answer :** 5volts is enough to supply the Arduino.

**Description :** Evaluate the following quantities and express your results in polar form

**Last Answer :** Evaluate the following quantities and express your results in polar form

**Description :** Calculate these complex numbers and express your results in rectangular form

**Last Answer :** Calculate these complex numbers and express your results in rectangular form

**Description :** I need a new 12 volt AC adapter; do amps matter?

**Last Answer :** answer:Amperage does matter. if you do not use the proper amperage for a certain device, it will either fry again or not work at all. i had this problem with an extended volume control on a ... they also have the best selection of AC adapters i have ever seen. they were very helpful at RS.

**Description :** Can I plug a 6V adapter into a USB-hub?

**Last Answer :** Try it for 15 mins, feel it, and if it scalds your hand like you just touched the sun, then its probably not a good idea to keep using this.

**Description :** How many amps run through a high tension power line?

**Last Answer :** Watts/Volts = Amps. So a typical 400 kV (400,000 V) might have a current draw of 100 MW (100,000,000 W). This would equal 250 Amps.

**Description :** How many volts is 13.8 kV?

**Last Answer :** 13,800 volts1 kv = 1 kilovolt = 1000 volts

**Description :** How many volts is 13.8 kV?

**Last Answer :** 13,800 volts1 kv = 1 kilovolt = 1000 volts

**Description :** The dielectric strength of a vacuum or dry air is approximately ________________. A. 450 volts/inch B. 1000 volts/inch C. 20-kv/inch D. 50-kv/inch

**Last Answer :** Answer: C

**Description :** Express the following in more simple terms. (a) 250,000 volts, (b) 25,000,000 microvolts, (c) 0.001 millivolt.

**Last Answer :** (a) 250 kV, (b) 25 V, (c) 1µV

What unit is used to express the number of amps and volts needed by a particular device to function?

**Description :** What unit is used to express the number of amps and volts needed by a particular device to function?

**Last Answer :** Feel Free to Answer

**Description :** Transmission voltage of ll kV is normally used for distances upto (a) 20—25 km (b) 40—50 km (c) 60—70 km (d) 80—100 km

**Last Answer :** (a) 20—25 km

**Description :** The voltage at the two ends of a transmission line are 132 KV and its reactance is 40 ohm. The Capacity of the line is (A) 435.6 MW (B) 217.8 MW (C) 251.5 MW (D) 500 MW

**Last Answer :** (A) 435.6 MW

**Description :** If voltage at the two ends of a transmission line is 132 kV and its reactance is 40 Ohms, the capacity of the line will be: (A) 435.6 MW (B) 217.8 MW(C) 251.5 MW (D) 500 MW

**Last Answer :** If voltage at the two ends of a transmission line is 132 kV and its reactance is 40 Ohms, the capacity of the line will be: 435.6 MW

**Description :** A common-emitter circuit has an input voltage of 0.1 volt, an output voltage of 2.0 volts, an input current of 0.5 milliamps, and an output current of 10 milliamps. What is the power gain? A. 20 B. 40 C. 400 D. 4000

**Last Answer :** Answer: C

**Description :** The power supplied to a motor is six kilowatts at 120 volts. What is the impedance of the motor? A. 0.05 Ohms B. 0.50 Ohms C. 2.40 Ohms D. 24.00 Ohms

**Last Answer :** Answer: C

**Description :** The per unit impedance of a circuit element is 0.30. If the base kV and base MVA are halved, then the new value of the per unit impedance of the circuit element will be: (A) 0.3 (B) 0.6 (C) 0.003 (D) 0.006

**Last Answer :** 3

**Description :** What would be the power consumed in the combined parallel section of the circuit shown in the illustration if the source were 30 volts and the resistance for R1 is 10 ohms, R2 is 10 ohms, and R3 is 10 ohms? EL-0032 A. 5 watts B. 10 watts C. 20 watts D. 40 watts

**Last Answer :** Answer: C

**Description :** What power would be consumed by the series resistor of the circuit shown in the illustration if the source is 30 volts, the resistance of R1 is 10 ohms, R2 is 10 ohms, and R3 is 10 ohms? EL-0032 A. 5 watts B. 10 watts C. 20 watts D. 40 watts

**Last Answer :** Answer: D

**Description :** What power would be consumed in EACH of the branch resistors of the circuit shown in the illustration if the source is 30 volts, the resistance for R1 is 10 ohms, R2 is 10 ohms and R3 is 10 ohms? EL-0032 A. 5 watts B. 10 watts C. 20 watts D. 40 watts

**Last Answer :** Answer: B

**Description :** What would be the total power consumed in the circuit shown in the illustration if the source is 30 volts the resistance for R1 is 10 ohms, R2 is 10 ohms, and R3 is 10 ohms? EL-0032 A. 10 watts B. 40 watts C. 45 watts D. 60 watts

**Last Answer :** Answer: D

**Description :** A transformer steps down 220V to 40 volts. If the secondary turns are 40 then primary turns will be: a. 20 b. 40 c. 120 d. 220

**Last Answer :** d. 220V

**Description :** In changing from an energy state of -1.51 electron-volts to -3.40 electron-volts, an atom emits a photon whose energy is: w) 1.51 electron-volts x) 1.89 electron-volts y) 3.40 electron-volts z) 4.91 electron-volts

**Last Answer :** ANSWER: X -- 1.89 ELECTRON-VOLTS

**Description :** A single core cable is designed to work for a single phase system with a peak voltage of 220 kV. The maximum permissible stress in the dielectric is not to exceed 20 kV/mm. For economical size, the overall core diameter of the cable is (A) 28.2 mm (B) 26.4 mm (C) 24.4 mm (D) 22.0 mm

**Last Answer :** A single core cable is designed to work for a single phase system with a peak voltage of 220 kV. The maximum permissible stress in the dielectric is not to exceed 20 kV/mm. For economical size, the overall core diameter of the cable is 22.0 mm

**Description :** A 3-phase star-connected 75 MVA, 25 kV 3-phase synchronous generator has a synchronous reactance of 1.0 p.u. The per unit value to a 90 MVA base and 30 kV is (A) 2/15 p.u. (B) 5/6 p.u. (C) 1.0 p.u. (D) 1.2 p.u.

**Last Answer :** A 3-phase star-connected 75 MVA, 25 kV 3-phase synchronous generator has a synchronous reactance of 1.0 p.u. The per unit value to a 90 MVA base and 30 kV is 5/6 p.u.

The corona loss of a 3-phase transmission line is 100 kW at 60 kV/phase and 25 kW at 50 kV/phase....

**Description :** The corona loss of a 3-phase transmission line is 100 kW at 60 kV/phase and 25 kW at 50 kV/phase. The disruptive critical voltage is (A) 40 kV (B) 43.6 kV (C) 49.6 kV (D) 50 kV

**Last Answer :** The corona loss of a 3-phase transmission line is 100 kW at 60 kV/phase and 25 kW at 50 kV/phase. The disruptive critical voltage is 40 kV

**Description :** A 1100 kVA, 11 kV/1.1 kV conventional two-winding transformer is connected as a 12.1 kV/11 kV step-down auto-transformer. The rating of the auto-transformer is (A) 1000 kVA (B) 1100 kVA (C) 11000 kVA (D) 12100 kVA

**Last Answer :** A 1100 kVA, 11 kV/1.1 kV conventional two-winding transformer is connected as a 12.1 kV/11 kV step-down auto-transformer. The rating of the auto-transformer is 12100 kVA

**Description :** In a certain three -wire Y -connected generator, the phase voltages are 2 kV. The magnitudes of the line voltages will be: A. 2,000 V B. 6,000 V C. 666 V D. 3,464 V

**Last Answer :** In a certain three -wire Y -connected generator, the phase voltages are 2 kV. The magnitudes of the line voltages will be: 3,464 V

**Description :** A 3-phase circuit breaker is rated at 1250 A, 2000 MVA, 33 kV, 4s. Its making current capacity will be (a) 35 kA (b) 89 kA (c) 79 kA (d) 69 kA

**Last Answer :** 89

**Description :** An Oil-filled cable has a working stress of ___________ kV/mm. (A) 10 (B) 12 (C) 13 (D) 15

**Last Answer :** Answer : (D) 15

**Description :** A single phase transformer rated at 3000 kVA, 69 kV 4.16 kV, 60 Hz has a total internal impedance Zp of 127 ohm, referred to the primary side. Calculate the primary current if the secondary is accidentally short circuited. (A) 43.5 A (B) 543 A (C) 9006 A (D) 721 A

**Last Answer :** 543A

**Description :** A 60 Hz, 4 pole turbo generator rated 100 MVA, 13.8 KV has an inertia constant of 10 MJ/MVA. Find the stored energy in the rotor at synchronous speed. (A) 10 MJ (B) 100 J (C) 1000 J (D) 1000 MJ

**Last Answer :** c

**Description :** A 400/200 volts transformer has pu impedance of 0.05. The HV side voltage required to circulate full load current during short circuit test is

**Last Answer :** A 400/200 volts transformer has pu impedance of 0.05. The HV side voltage required to circulate full load current during short circuit test is 20 V

**Description :** If we give 2334 A, 540V on Primary side of 1.125 MVA step up transformer, then what will be the Secondary Current, If Secondary Voltage=11 KV?

**Last Answer :** A. As we know the Voltage & current relation for transformer-V1/V2 = I2/I1 We Know, VI= 540 V; V2=11KV or 11000 V; I1= 2334 Amps. By putting these value on Relation540/11000= I2/2334 So,I2 = 114.5 Amps

**Description :** During unit operation can we have one UT feeding both unit 6.6 kV loads?

**Last Answer :** No, logically prevented.

**Description :** If we give 2334 A, 540V on Primary side of 1.125 MVA step up transformer, then what will be the Secondary Current, If Secondary Voltage=11 KV?

**Last Answer :** As we know the Voltage & current relation for transformer-V1/V2 = I2/I1 We Know, VI= 540 V; V2=11KV or 11000 V; I1= 2334 Amps. By putting these value on Relation540/11000= I2/2334 So,I2 = 114.5 Amps

**Description :** Electric field strength on a dust particle having charge equal to 8 × 10- 19 when plates are separated by distance of 2 cm and have a potential difference of 5 kV is A. 2.0 × 10-13 N B. 3 N C. 5 N D. 20 N

**Last Answer :** 2.0 × 10-13 N

**Description :** Air blast circuit breakers for 400 kV power system are designed to operate in (a) 100 microsecond (b) 50 millisecond (c) 0.5 sec (d) 0.1 sec

**Last Answer :** (b) 50 millisecond

**Description :** The minimum clearance between the ground and a 220 kV line is about (a) 4.3 m (b) 5.5 m (c) 7.0 m (d) 10.5 m

**Last Answer :** (c) 7.0 m

**Description :** The minimum clearance between the ground and a 220 kV line is about (a) 4.3 m (b) 5.5 m (c) 7.0 m (d) 10.5 m

**Last Answer :** (c) 7.0 m

**Description :** A practical formula for determining the thickness of insulation between low voltage and high voltage windings is (a) 1 + 0.2 kVmm (6) 2 + 0.5 kVmm (c) 4 + 0.7 kV mm (d) 5 + 0.9 kV mm

**Last Answer :** (d) 5 + 0.9 kV mm

**Description :** For 275 kV transformers, using cold rolled grain oriented steel, which of the following values of flux density may be used? (a) 1.0 Wb/m2 (b) 1.1 Wb/m2 (c) 1.3 Wb/m2 (d) 1.6 Wb/m2 (e) None of the above

**Last Answer :** (d) 1.6 Wb/m2

**Description :** A 50 Hz, 4-pole, 500 MVA, 22 kV turbo-generator is delivering rated megavolt amperes at 0.8 power factor. Suddenly a fault occurs reducing in electric power output by 40%. Neglect losses and assume constant power input to the ... the time of fault will be (A) 1.528 (B) 1.018 (C) 0.848 (D) 0.509

**Last Answer :** A 50 Hz, 4-pole, 500 MVA, 22 kV turbo-generator is delivering rated megavolt amperes at 0.8 power factor. Suddenly a fault occurs reducing in electric power output by 40%. Neglect losses and assume ... the shaft. The accelerating torque in the generator in MNm at the time of fault will be 1.018

**Description :** A 500 MW, 3-phase, Y-connected synchronous generator has a rated voltage of 21.5 kV at 0.85 p.f. The line current when operating at full load rated conditions will be (A) 13.43 kA (B) 15.79 kA (C) 23.25 kA (D) 27.36 kA

**Last Answer :** A 500 MW, 3-phase, Y-connected synchronous generator has a rated voltage of 21.5 kV at 0.85 p.f. The line current when operating at full load rated conditions will be 15.79 kA

**Description :** A 500 MVA, 11 KV synchronous generator has 0.2 p.u. synchronous reactance. The p.u. synchronous reactance on the base values of 100 MVA and 22 KV is A) 0.16 B) 0.01 C) 4.0 D) 0.25

**Last Answer :** A 500 MVA, 11 KV synchronous generator has 0.2 p.u. synchronous reactance. The p.u. synchronous reactance on the base values of 100 MVA and 22 KV is 0.01

**Description :** A transmission line has 1 P.0 impedance on a base of 11 KV, 100 MVA. On a base of 55 KV. it will have a P.0 impedance of

**Last Answer :** A transmission line has 1 P.0 impedance on a base of 11 KV, 100 MVA. On a base of 55 KV. it will have a P.0 impedance of 0.02 P.U

**Description :** A 4000 kVA, 11 kV/132 kV delta-star connected 3-phase transformer has reactance, x1 = 0.12 p.u. The actual value of x1 referred to the low voltage side is (A) 0.85 Ω (B) 3.63 Ω (C) 36.3 Ω (D) 252 Ω

**Last Answer :** A 4000 kVA, 11 kV/132 kV delta-star connected 3-phase transformer has reactance, x1 = 0.12 p.u. The actual value of x1 referred to the low voltage side is 3.63 Ω

**Description :** A 3-phase, 11 kv, 50 Hz, 200 kW load has a power factor of 0.8 lag. A delta connected 3-phase capacitor is used to improve the power factor to unity. The capacitance perphase of the capacitor in micro-farads is?

**Last Answer :** A 3-phase, 11 kv, 50 Hz, 200 kW load has a power factor of 0.8 lag. A delta connected 3-phase capacitor is used to improve the power factor to unity. The capacitance perphase of the capacitor in micro-farads is 1.316.