15 Questions
In power transmission, the volume of conductor required is most closely related to which of the following?
The volume of the conductor is inversely proportional to the square of the voltage and directly proportional to power factor of load
Is there a skin effect in d.c. transmission?
False
If the voltage in a constant efficiency transmission is increased n times, what happens to the size of the conductor?
Increased to n2 that of the original
Is the percentage regulation of a transmission line inversely proportional to the square of the voltage?
True
In a distribution system, if synchronous capacitors are used for improving the power factor, where is the correct location for them?
At the receiving end
In the context of power generation, the working cost of a generating plant to give the same increase in power is?
Equal to the working cost of generating plant to give the same increase in power
For successful parallel operation of alternators, which of the following is a necessity?
Reactance
When two alternators are running in parallel, the synchronizing power developed will be maximum when?
The armature have less reactances than their resistances
In parallel operation of alternators, the synchronizing power developed in one of the alternators will load the same alternator in which it is developed and reduce its speed. Is this statement true or false?
True
When two alternators are running in parallel and the excitation of one alternator is more than the other, will the alternator having more excitation transfer the real power to the other alternator?
True
A change in excitation of a machine changes terminal voltage for a single machine supplying a local load. Is this also true for infinite busbars?
True
The actual division of total kW load between alternators running in parallel depends upon which characteristic?
A or B
The division of total reactive KVA between alternators will depend upon which characteristic?
Voltage-load characteristic
What is the critical value of surge impedance of large transmission line?
75 ohms
What is the surge impedance of telephone line?
75 ohms
Test your knowledge on power transmission and conductor volume requirements based on power loss, voltage, and power factor. Choose the correct relationship between these parameters to determine the volume of conductor needed for power transmission.
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
Get started for free
