1. The use of strain type insulators is made where the conductors are ?

dead ended

at intermediate anchor towers

any of the above

none of the above

Answer: any of the above

Explanation:


2. A conductor, due to sag between two supports, takes the form of ?

semi-circle

triangle

ellipse

catenary

Answer: catenary

Explanation:


3. As compared to a 2-wire DC distributor, a 3-wire distributor with same maximum voltage to earth uses only ?

31.26 percent of copper

33.3 percent of copper

66.7 percent of copper

125 percent of copper

Answer: 31.26 percent of copper

Explanation:


4. Transmission line insulators are made of ?

glass

porcelain

iron

P.V.C.

Answer: porcelain

Explanation:


5. The operating voltage of high voltage cables is upto ?

1.1 kV

3.3 kV

6:6 kV

11 kV

Answer: 11 kV

Explanation:


6. Overhead system can be designed for operation upto ?

11 kV

33 kV

66 kV

400 kV

Answer: 400 kV

Explanation:


7. In a D.C. 3-wire distribution system, balancer fields are cross-connected in order to ?

boost the generated voltage

balance loads on both sides of the neutral

make both machines run as unloaded motors

equalize voltages on the positive and negative outers

Answer: equalize voltages on the positive and negative outers

Explanation:


8. For aluminium, as compared to copper, all the following factors have higher values except ?

specific volume

electrical conductivity

co-efficient of linear expansion

resistance per unit length for same cross-section

Answer: electrical conductivity

Explanation:


9. On which of the following factors skin effect depends ?

Frequency of the current

Size of the conductor

Resistivity of the conductor material

All of the above

Answer: All of the above

Explanation:


10. When an alternator connected to the bus-bar is shut down the bus-bar voltage will ?

fall

rise

remain unchanged

none of the above

Answer: remain unchanged

Explanation: