Power Systems — Test 1

Correct Answer: B. B. Workstations
Explanation: The interfaces associated with various functions and services have been standardized in the TMN model. System operators interface with the operations systems using workstations.

Correct Answer: C. C. More than 20 kv
Explanation: Transmission lines having length more than 80 Km and less than 200 Km, operating voltage between 20 KV and 100 KV fall in the category of medium transmission lines.

Correct Answer: B. B. Medium
Explanation: Owing to appreciable length and voltage of the line the charging current is appreciable in medium transmission lines. Also the capacitance effect cannot be ignored in medium transmission lines.

Correct Answer: D. D. Resistance, inductance and capacitance
Explanation: Medium transmission lines have enough value of resistance and inductance. Length and operating voltage of the medium transmission lines are sufficiently large to cause unavoidable charging current and therefore capacitance effect can not be ignored. Hence, performance of Medium transmission lines depends on R, L and C.

Correct Answer: D. D. On per phase basis
Explanation: Performance analysis of balance transmission line is done only. And is done on per phase basis. No symmetrical component method or reactance diagram method is required for performance analysis.

Correct Answer: B. B. Medium
Explanation: Length and operating voltage of the medium transmission lines are sufficiently large to cause unavoidable charging current and therefore capacitance effect can not be ignored. Capacitance effect in medium transmission line is less than that in long transmission line.

Correct Answer: A. A. True
Explanation: Ferranti effect happens when capacitance effect in medium or long transmission lines becomes greater than inductance effect. This happens during low or no load period.

Correct Answer: D. D. Lumped
Explanation: The series inductance and resistance of medium transmission lines are taken as lumped. This makes the performance analysis easier.

Correct Answer: B. B. Rlc circuit in pie form
Explanation: Medium transmission lines have considerable amount of inductance, resistance and shunt capacitance. Medium transmission lines are represented as either pie form or as T form.

Correct Answer: A. A. True
Explanation: In case of medium transmission lines the charging current is unavoidable but less than that in long transmission lines. So it does not cause much error in calculations if shunt capacitances are taken as lumped.