1. While analysing a short transmission line, we can neglect the
(a) skin effect.
(b) line losses.
(c) shunt admittance.
(d) series impedance.
Answer
2. The string efficiency of a high voltage line is around
(a) 20.
(b) 40.
(c) 80.
(d) 100.
Answer
3. If the transmission voltage is increased, the percentage resistance drop will
(a) increases.
(b) decreases.
(c) remain same.
(d) none of the above.
Answer
4. Material generally used for bus bar is
(a) copper
(b) aluminium
(c) steel
(d) tungsten.
Answer
5. The effect due to which a conductor carries more current on the surface as compared to core is
(a) proximity effect.
(b) corona effect.
(c) skin effect.
(d) Kelvin effect.
Answer
6. Power transmission capacity of a transmission line can increase by decreasing
(a) transmission voltage.
(b) capacitance.
(c) line inductance.
(d) all of the above.
Answer
7. In a transmission line booster transformer must be located at
(a) receiving end.
(b) sending end.
(c) intermediate point.
(d) any where in the line.
Answer
8. A booster is a
(a) series wound generator.
(b) shunt wound generator.
(c) synchronous generator.
(d) none of the above.
Answer
9. Pin type insulators are generally not used for voltages beyond
(a) 66 kV.
(b) 11 kV.
(c) 22 kV.
(d) 33 kV.
Answer
10. A 3-phase 4 wire system is commonly used on
(a) primary transmission.
(b) secondary transmission.
(c) primary distribution.
(d) secondary distribution.
Answer
11. Boosters are basically
(a) inductors.
(b) capacitors.
(c) transformers.
(d) synchronous motors.
Answer
12. The skin effect of a conductor will reduce as the
(a) diameter increases.
(b) frequency increases.
(c) permeability of conductor material increases.
(d) resistivity of conductor material increases.
Answer
13. If the frequency of a transmission system is increases, the string efficiency will
(a) increase.
(b) decrease.
(c) remain same.
(d) none of the above.
Answer
14. The equipment used to limit short circuit current in power system is
(a) series reactor.
(b) relay.
(c) lightening switch.
(d) capacitor.
Answer
15. If the lagging power factor of the load decreases, the line losses will
(a) decreases.
(b) increases.
(c) remains same.
(d) none of the above.