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MCQs on Transmission and Distribution

May 4, 2017 by admin

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1. While analysing a short transmission line, we can neglect the
(a) skin effect.
(b) line losses.
(c) shunt admittance.
(d) series impedance.   

Answer

           C 

2. The string efficiency of a high voltage line is around
(a) 20.
(b) 40.
(c) 80.
(d) 100.    

Answer

           C 

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

           B 

4. Material generally used for bus bar is
(a) copper
(b) aluminium
(c) steel
(d) tungsten.   

Answer

           B 

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

           C 

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

           C 

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

           C 

8. A booster is a
(a) series wound generator.
(b) shunt wound generator.
(c) synchronous generator.
(d) none of the above.   

Answer

           A 

9. Pin type insulators are generally not used for voltages beyond
(a) 66 kV.
(b) 11 kV.
(c) 22 kV.
(d) 33 kV.     

Answer

           D 

10. A 3-phase 4 wire system is commonly used on
(a) primary transmission.
(b) secondary transmission.
(c) primary distribution.
(d) secondary distribution.    

Answer

           D 

11. Boosters are basically
(a) inductors.
(b) capacitors.
(c) transformers.
(d) synchronous motors.    

Answer

           C 

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

           D 

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

           C 

14. The equipment used to limit short circuit current in power system is
(a) series reactor.
(b) relay.
(c) lightening switch.
(d) capacitor.    

Answer

           A 

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.   

Answer

           B 

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