Q.51 Three single-phase transformers are
connected to form a delta-star three-phase transformer of 110 kV/ 11 kV. The
transformer supplies at 11 kV a load of 8 MW at 0.8 p.f. lagging to a nearby
plant. Neglect the transformer losses. The ratio of phase currents in delta
side to star side is

A) 1 : 10√3

(B) 10√3 : 1

(C) 1 : 10

(D) √3 : 10

Answer: (C) 1 : 10

Q.52 The gain at the breakaway point of the
root locus of a unity feedback system with open loop transfer function

is

(A) 1

(B) 2

(C) 5

(D) 9

Answer: (A) 1

Q.53 Two identical unloaded generators are
connected in parallel as shown in the figure. Both the generators are having
positive, negative and zero sequence impedances of j0.4 p.u., j0.3 p.u. and
j0.15 p.u., respectively. If the pre-fault voltage is 1 p.u., for a
line-to-ground (L-G) fault at the terminals of the generators, the fault current,
in p.u., is ___________.

Answer: 2

Q.54 An energy meter, having meter constant
of 1200 revolutions/kWh, makes 20 revolutions in 30 seconds for a constant
load. The load, in kW, is _____________.

Answer: 2

Q.55 A rotating conductor of 1 m length is
placed in a radially outward (about the z-axis) magnetic flux density (B) of 1
Tesla as shown in figure below. Conductor is parallel to and at 1 m distance
from the z-axis. The speed of the conductor in r.p.m. required to induce a
voltage of 1 V across it, should be __________.

Answer: 1

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