TOP Transmission and Distribution Multiple choice Questions and Answers pdf

11.    Which of the following are the constants of the transmission lines ?
(a) Resistance 
(b) Inductance
(c) Capacitance    
(d) All of the above
Ans: d

12.    310 km line is considered as
(a) a long line 
(b) a medium line
(c) a short line     
(d) any of the above
Ans: a

13.    The phenomenon qf rise in voltage at the receiving end of the open-circuited or lightly loaded line is called the
(a) Seeback effect
(b) Ferranti effect
(c) Raman effect
(d) none of the above
Ans: b

14.    The square root of the ratio of line impedance and shunt admittance is called the
(a) surge impedance of the line
(b) conductance of the line
(c) regulation of the line
(d) none of the above
Ans: a

15.    Which of the following is the demerit of a 'constant voltage transmission system' ?
(a)    Increase of short-circuit current of the system
(b)    Availability of steady voltage at all loads at the line terminals
(c)    Possibility of better protection for the line due to possible use of higher terminal reactances
(d)     Improvement of power factor at times of moderate and heavy loads
(e)     Possibility of carrying increased power for a given conductor size in case of long-distance heavy power transmission
Ans: a

16.    Low voltage cables are meant for use up to
(a)l.lkV 
(b)3.3kV
(c)6.6kV 
(d)llkV
Ans: e

17.    The operating voltage of high voltage cables is upto
(a)l.lkV 
(b)3.3kV
(c)6.6kV 
(d)llkV
Ans: d

18.    The operating voltage of supertension cables is upto
(a) 3.3 kV 
(b) 6.6 kV
(c) 11 kV 
(d) 33 kV
Ans: d

19.    The operating voltage of extra high tension cables is upto
(a) 6.6 kV 
(b) 11 kV
(c) 33 kV 
(d) 66 kV
(e) 132 kV
Ans: d

20.    Which of the following methods is used for laying of underground cables ?
(a) Direct laying  
(b) Draw-in-system
(c) Solid system   
(d) All of the above
Ans: d

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