Questions |
Questions |
1 | A trio of generators are connected to 'a star': | ||
A) | If they have a terminal in common | ||
B) | If they have 2 terminals in common | ||
C) | If they feed a triphase system | ||
D) | If they feed a balanced triphase system |
2 | A trio of generators are connected to 'a triangle': | ||
A) | If they have a terminal in common | ||
B) | If they have 2 terminals in common | ||
C) | If they are connected so that they form the sides of a triangle | ||
D) | If they are connected in series |
3 | 3 'triangle' generator are equivalent to 3 'star' generators even if they produce: : | ||
A) | A trio of tensions that are exactly the same as the star tensions resulting from the 3 'star' generators | ||
B) | A trio of tensions that are exactly the same as concatenated resulting from 3 'star' generators | ||
C) | A trio of balanced currents | ||
D) | A trio of symmetrical currents |
4 | A trio of impedences are connected in 'a star': | ||
A) | If they have a terminal in common | ||
B) | If they have 2 terminals in common | ||
C) | If they are in a series | ||
D) | If they are parallel |
5 | A load constituting 3 impedences is defined as balanced if: | ||
A) | The 3 impedences are null | ||
B) | The 3 impedences are only imaginary | ||
C) | The 3 impedences only have a real part | ||
D) | The 3 impedences are the same |
6 | A balanced load fed by a trio of symmetrical tensions, absorbs: : | ||
A) | A trio of balanced currents | ||
B) | A trio of symmetrical currents | ||
C) | A trio of spurious currents | ||
D) | A trio of null currents |
7 | In a symmetrical and balanced triphase system, tensions between the two star centres: : | ||
A) | Worth zero | ||
B) | Dipends on the tension values | ||
C) | Dipends on the current values | ||
D) | Coincides with the current output and impedence of each branch |
8 | In a symmetrical and balanced triphase system: | ||
A) | Each phase transfers a null power to the load | ||
B) | Each phase transfers 1/3 of total power to the load | ||
C) | Only the first phase transfers power to the load | ||
D) | Each phase transfers power proportional to the initial phase of the respective generators, to the load |
9 | The equivalent monophase system: | ||
A) | Allows the study of any triphase system | ||
B) | Allows the study of any symmetrical triphase system | ||
C) | Allows the study of any balanced triphase system | ||
D) | Allows the study of any symmetrical and balanced triphase system |
10 | Millman's theorm: | ||
A) | Applies only to symmetrical and balanced triphase systems | ||
B) | Applies only to symmetrical triphase systems | ||
C) | Applies only to balanced triphase systems | ||
D) | Applies to any triphase system | ||