MCQs on Transmission and Distribution

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1. The dielectric strength of air under normal condition is
(a) 30 kV/cm.
(b) 100 kV/cm.
(c) 150 kV/cm.
(d) 200 kV/cm.  

2. Peterson coil is used in
(a) DC transmission line.
(b) AC transmission line.
(c) DC generator.
(d) Alternator.    

3. Bundled conductors in EHV transmission lines
(a) increase inductance.
(b) increase capacitance.
(c) decrease inductance.
(d) decrease capacitance.    

4. The most commonly used lighting arrester in substations is
(a) horn gap.
(b) god gap.
(c) thyrite.
(d) multi gap.   

5. The reflection coefficient for a open circuit line is
(a) 1.
(b) zero.
(c) 0.5.
(d) – 1.   

6. The reflection coefficient for a short circuit line is
(a) 1.
(b) Zero.
(c) 0.5.
(d) – 1.     

7. The voltage regulation of a transmission line is greatest for
(a) lagging power factor.
(b) leading power factor.
(c) zero power factor.
(d) none of these.   

8. The function of booster in the circuit is to
(a) reduce current.
(b) increase current.
(c) reduce voltage drop.
(d) compensate for voltage drop.    

9. The rated voltage of a 3-phase power system is given as
(a) rms line to line voltage.
(b) peak line to line voltage.
(c) rms phase voltage.
(d) peak phase voltage.    

10. The number of strands of ACSR conductor for 3 layer transmission line are
(a) 3.
(b) 11.
(c) 19.
(d) 23.   

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