This set of Tough Power Systems Questions and Answers focuses on “Switchgear and Protection – 4”. 1. An isolated generator connected to a turbine with its continuous maximum power of 20 MW, 50 Hz. Generator connected with two loads of 8 MW, each operate at 50 Hz.. Generator has 5% droop characteristic. If an additional … Read more
This set of Tricky Power Systems Questions and Answers focuses on “Switchgear and Protection – 3”. 1. A power system network is connected as shown in the figure below. Sd1=15+j5 pu Sd2=25+j15 pu Zcable = j0.05pu |V1|=|V2|=1 pu. The torque angle for the system will be _______ a) 14.4 b) 22.1 c) 16.2 d) 18.2 … Read more
This set of Advanced Power Systems Questions and Answers focuses on “Switchgear and Protection – 2”. 1. A protection system engineer is planning to provide the complete protection, he can achieve this by ___________ a) three phase fault relays and two earth fault relays b) two phase fault relays and three earth fault relays c) … Read more
This set of Power Systems Multiple Choice Questions & Answers (MCQs) focuses on “Switchgear and Protection – 1”. 1. The factor which influences the acr de ionisation dominantly ________ a) line voltage b) magnitude of transient fault current c) speed of reclosure d) all of the mentioned 2. A three phase transformer having a line … Read more
This set of Basic Power Systems Questions and Answers focuses on “Insulator for Overhead Lines – 2”. 1. The unequal voltage distribution across individual unit of string of suspension insulator is __________ a) desirable and expressed by string efficiency b) undesirable and expressed by string efficiency c) desirable and expressed by impulse ratio d) undesirable … Read more
This set of Power Systems Multiple Choice Questions & Answers (MCQs) focuses on “Insulator for Overhead Lines – 1”. 1. Which of the following material is not used for overhead line insulators? a) Porcelain b) Glass c) PVC d) Steatite 2. Pin type insulator are mostly subjected to which type of mechanical stress? a) Compressive … Read more
This set of Power Systems Problems focuses on “Underground Cables – 2”. 1. For a string of five suspension insulators is to be fitted with a grading ring. If the pin to earth capacitances is equal to C, then the value of line to pin capacitance of first capacitance is a) 0.25C b) 0.667C c) … Read more
This set of Power Systems Multiple Choice Questions & Answers (MCQs) focuses on “Underground Cables – 1”. 1. Single core cables for AC systems are not provided with armouring. a) True b) False 2. Single core cables for ac systems are provided with armouring. a) True b) False 3. Potential gradient of single core cable … Read more
This set of Power Systems Assessment Questions and Answers focuses on “Distribution Systems – 3”. 1. For an ac three-phase four wire system, having a voltage of 415V, with load of 120 kW and resistance of 0.05Ω at power factor of 0.75. The incurred copper losses of the system is ____ a) 4.955 kW b) … Read more
This set of Power Systems Questions and Answers for Aptitude test focuses on “Distribution Systems – 2”. 1. For the given circuit diagram for the substation the voltage between the two outer conductors is __________ 2. For the given circuit diagram for the substation fed with 315 kV, the voltage between the two outer conductors … Read more
