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Describe the principle of operation of a camera

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Air blast circuit breakers for 400 kV power system are designed to operate in 50 millisecond.

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Explain fuel system and air intake system in diesel electric power plant.

asked Sep 8, 2018 by Shimroz123
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The following is/are the characteristics of SF6 circuit breakers:  (A) It does not need an auxiliary breaking chamber (B) Short break time of 2 to 2.5 cycles (C) All of the above (D) None of the above

asked May 8, 2018 in Switchgear And Protection by Shimroz123
1 answer 26 views

A circuit breaker is designed to protect an electrical circuit from damage caused by :  (A) Over load (B) Short circuit (C) Over current (D) All of the above

asked May 8, 2018 in Switchgear And Protection by Shimroz123
1 answer 36 views

Which of the following circuit breakers has high reliability & minimum maintenance?  (A) Bulk oil type CB (B) Air blast CB (C) Vacuum CB (D) Sulphur hexafluoride CB 

asked May 8, 2018 in Switchgear And Protection by Shimroz123
1 answer 73 views

What would happen if a power transformer designed for operation on 50 Hz (frequency) were connected to a 500 Hz (frequency) source of the same voltage:  (A) Eddy Current and Hysteresis losses will be excessive  (B) Current will be too much high  (C) Transformer may start to smoke and burn  (D) No effect

asked May 8, 2018 in Electrical Engineering by Shimroz123
1 answer 33 views

What is the maximum number of circuit breakers in a panel?

asked Mar 10, 2018 in Advanced electrical power system by Quiz
1 answer 25 views

Magnetic circuit breakers use _________ A) Permanent magnets B) Earth magnets C) Solenoid D) All the above

asked Apr 29, 2018 in Electrical Engineering by Shimroz123
1 answer 4 views

State the functions of following elements: i) Diesel engine system ii) Air intake system iii) Engine exhaust system iv) Engine starting system.

asked Sep 7, 2018 by Shimroz123
1 answer 156 views

For a 15-bus power system with 3 voltage controlled buses, the size of Jacobian matrix is

asked Apr 27, 2018 in Switchgear And Protection by Shimroz123
1 answer 446 views

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

asked Apr 28, 2018 in Electrical Engineering by Shimroz123
1 answer 19 views

A lightening arrester connected between the line and earth in a power system  (1) protects the terminal equipment against travelling surges (2) protects the transmission line against direct lightening strokes (3) suppresses high frequency oscillations in the line (4) reflects back the travelling wave approaching it

asked Apr 29, 2018 in Switchgear And Protection by Shimroz123
1 answer 14 views

If non-linear loads are connected to the power system, then (A) displacement power factor is same as the total power factor (B) displacement power factor is not equal to the total power factor (C) displacement power factor is due to harmonic currents (D) total power factor is due to fundamental component of current

asked Apr 28, 2018 in Power system by Shimroz123
1 answer 36 views

With fault clearing time, the transient stability of a power system

asked Apr 27, 2018 in Switchgear And Protection by Shimroz123
3 answers 144 views

What are interconnected power system?

asked Mar 10, 2018 in Advanced electrical power system by Quiz
1 answer 20 views

What are the components of a power system?

asked Mar 10, 2018 in Advanced electrical power system by Quiz
1 answer 23 views

Power factor of an inductive circuit is usually improved by connecting capacitor to it in?

asked Mar 25, 2018 in Electrical Engineering by Shimroz123
1 answer 4 views

Explain starting system in diesel electric power plant.

asked Sep 8, 2018 by Shimroz123
1 answer 18 views

What is the choice of size and number of generator units in interconnected power system?

asked Sep 7, 2018 by Shimroz123
1 answer 26 views

Generally in a power system network, the load is represented as a :  (A) Constant power in both load flow study and in stability study  (B) Constant power in load flow study and constant impedance in stability study  (C) Constant power in stability study and constant impedance in load flow study  (D) Constant impedance in both load flow study and in stability study

asked Apr 30, 2018 in Power system by Shimroz123
1 answer 36 views

In voltage source converter based HVDC transmission system the active power is controlled by changing (A) phase angle of the converter ac input voltage (B) supply frequency of the converter ac input voltage (C) magnitude of the converter ac input voltage (D) DC voltage at the inverter terminals

asked Apr 28, 2018 in High voltage engineering by Shimroz123
1 answer 18 views

The benefit of power factor correction in a power system is (A) lower power consumption (B) increased demand charge (C) reduced load carrying capabilities in existing lines (D) reduced voltage profile

asked Apr 28, 2018 in Power system by Shimroz123
2 answers 53 views

What is sag in power system?

asked Mar 10, 2018 in Advanced electrical power system by Quiz
1 answer 33 views

What is meant by feeder in power system?

asked Mar 10, 2018 in Advanced electrical power system by Quiz
0 answers 41 views

What is microgrid in power system?

asked Mar 10, 2018 in Advanced electrical power system by Quiz
1 answer 12 views

State maximum power transfer theorem for DC circuit.

asked Sep 6, 2018 by Shimroz123
1 answer 16 views

A snubber circuit is connected to the power semiconductor device to reduce the (A) turn-on time (B) turn-off time (C) electrical stresses (D) thermal resistance

asked Apr 28, 2018 in Electronics Engineering by Shimroz123
1 answer 31 views

Power factor of an electrical circuit is equal to?

asked Mar 24, 2018 in Electrical Engineering by Shimroz123
1 answer 25 views

An air gap is usually inserted in magnetic circuits to?

asked Mar 25, 2018 in Electrical Engineering by Shimroz123
1 answer 11 views

List any two methods of reactive power measurement in 3 phase circuit.

asked Sep 6, 2018 by Shimroz123
1 answer 78 views

In a pure resistive circuit, the average power Pavg is ______ the peak power Pmax. (1) Double (2) One-half of (3) One-fourth (4) Equal to

asked May 1, 2018 in Network Analysis by Shimroz123
1 answer 25 views

In an A.C. circuit power is dissipated in?

asked Mar 25, 2018 in Electrical Engineering by Shimroz123
1 answer 97 views

The apparent power drawn by an A.C. circuit is 10 kVA and active power is 8 kW. The reactive power in the circuit is?

asked Mar 25, 2018 in Electrical Engineering by Shimroz123

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