Questions asked in Electrical License by NEC

All these questions are from Electrical Engineering Licence taken by NEC and held on asar 8. All questions and options may not be exactly same as asked in Examination because all questions are written by myself just after remembering it. I passed my license exam so you can trust this question and answer but these maybe technical errors for that I feel sorry. Let's go to our question section.

1. At which angle, Electrical element or machine will absorbed least power?
a. 180
b. 90
c. 60
d. 30
2. A insulated winding coil has 800 turns and 3200 Ampere turn is following through it. Find the current in the wire?
a. 6
b. 8
c. 4
d. 1
3. An UPS system has battery 120 Ah capacity, which is used for backup supply. 12V battery/supply is used for a machine of 240 W. Find how many hours it can supply power?
a. 6
b. 12
c. 3
d. 120
4. A power system has Sending end voltage(Vs), Receiving end voltage(Vr) , line reactance(jX), then load angle(δ) will
a. 0 - 90
b. 90 - 0
c. 60
d. 30
5. Which equipment or element is responsible for low power factor in distributed system?
a. induction motor at milling
b. DC motor
c. Synchronous motor
d. DC generator
6. Which of the following is responsible for wind energy?
a. Vegitation
b. Hilly region
c. Flat surface'
d. Sun
7. How many pn junction does a thyristor have?
a. 1
b. 2
c. 3
d. 4
8. If negative pulse is given in a thyristor, it can be used in
a. Voltage regulation
b. Rectifier
d. DC - DC converter
d. Inverter
9. A diesel power plant is used as
a. Base load plant
b. Stand-by plant
c. Peak load plant
d. Both b and c
10. Which of the following statements accurately describes the working principles of water turbines?
a. Water turbines utilize the kinetic energy of water to generate mechanical power
b. Water turbines harness the potential energy of water to produce electricity
c. Water turbines convert the chemical energy of water into rotational motion
d. Water turbines rely on the thermal energy of water to generate hydraulic power
11. Z - bus is known as
a. Full matrix
b. Spare matrix
c. Null matrix
d. Unity matrix
12. How many root locis are there. Y(s) = 1/ [s(s+2)(s+4)(s+9)]
a. 2
b. 3
c. 4
d. 5
13. For what value of k, the system will stable? 2s^4-4ks^3+3s^2+2s-2 = 0
a. Stable if k>0
b. Stable if K<0
c. Stable for any value of k
d. not satble
14. What happened with three phase instantenous power, when power freqency is changed
a. Increase
b. Constant for any frequency
c. Decrease
d. None
15. A single phase AC system has inductance load. If the frequency is half then find currrent?
a. Double
b. One fourth
c. Half
d. Constant