B:-v2/X

C:- 2 /X

D:-None of the above
Correct Answer:- Option-A

Question71:-Ildentify the true statement from the following with respect to distance
relays

A:-Mho relay is more appropriate for protection of short transmission lines

B:-Impedance relay is more appropriate for protection of medium transmission
lines

C:-Reactance relay is more appropriate for protection of long transmission
lines

D:-Mho relay is highly affected due to power swings
Correct Answer:- Option-B

Question72:-An IDMT relay has a current setting of 150%. The relay is connected in
the circuit through a CT having ratio 400/5. If the fault current in relay coil is 4800,
Obtain the plug setting multiplier

A:-2

B:-4

C:-8

D:-16

Correct Answer:- Option-C

Question73:-The synchronous reactance of a 4000 MVA, 10 kV synchronous
generator is 0.1 p.u. Determine the synchronous reactance on the base values of
1000 MVA, 20 kV.

A:-0.01 25 p.u

B:-6.25 X 10-3 0.0.

C:-0.1 p.u.

D:-None of the above
Correct Answer:- Option-B

Question74:-Consider the following statements

(൨) Ferranti effect on long overhead lines is experienced when it is at full load at
unity power factor

(2) Bundled conductors are employed to improve the mechanical stability of the
transmission line

(3) Skin effect lessens the effective area of cross-section of the conductor and
hence increases its effective resistance

(4) The proximity effect is lesser for stranded conductors than solid conductors
Which of the statements are correct?

A:-1, 2 and 3
B:-2 and 3