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Which of the following reactance is eliminated first in synchronous generator just after the symmetrical fault?
a Explanation: As the damper winding currents are first to die out, damper winding reactance effectively becomes open circuited. After that Approximate circuit model of synchronous generator contains only leakage reactance, field winding reactance and armature winding reactance.
a
See lessExplanation: As the damper winding currents are first to die out, damper winding
reactance effectively becomes open circuited. After that Approximate circuit model of
synchronous generator contains only leakage reactance, field winding reactance and
armature winding reactance.
Which type of insulator is used where there is dead end of the line or there is a corner or a sharp curve, for high voltage line?
d Explanation: Pin type insulators cannot be used in such situations because they cannot take conductor mechanical load intention which often occurs in such situations for low voltage line. Shackle insulator can be used but for higher voltages transmission lines strain insulator consisting of assembRead more
d
See lessExplanation: Pin type insulators cannot be used in such situations because they cannot
take conductor mechanical load intention which often occurs in such situations for low
voltage line. Shackle insulator can be used but for higher voltages transmission lines
strain insulator consisting of assembly of suspension type insulator are used.
Which of the following location is suitable to use shackle insulator?
: a Explanation: Shackle insulator are almost universally used for low voltage lines. They can be used at all positions either intermediate terminal or angle where the angle exceed 60 degree deviation. They are generally used in conjunction with shackle sharps.
: a
See lessExplanation: Shackle insulator are almost universally used for low voltage lines. They
can be used at all positions either intermediate terminal or angle where the angle
exceed 60 degree deviation. They are generally used in conjunction with shackle
sharps.
Which of the following pollutants emitted by thermal power plant causes irritation in Eyes?
a Explanation: At high temperatures existing in the flame core of high power boilers, the nitrogen of fuel and air may partially be oxidised to form nitrogen oxides. These are toxic and produce a sharp irritating effect especially on the mucous membrane of the eye
a
See lessExplanation: At high temperatures existing in the flame core of high power boilers, the
nitrogen of fuel and air may partially be oxidised to form nitrogen oxides. These are toxic
and produce a sharp irritating effect especially on the mucous membrane of the eye
Which of the following element of hydroelectric power plant prevents the penstock from water hammer phenomenon?
a Explanation: Sudden increase in water pressure in penstock due to closing of gates is called water hammer. Surge tank is a tank at sufficient height , connected to penstock through riser pipe. It takes the rejected water and relives the penstock from excessive water hammer pressure.
a
See lessExplanation: Sudden increase in water pressure in penstock due to closing of gates is
called water hammer. Surge tank is a tank at sufficient height , connected to penstock
through riser pipe. It takes the rejected water and relives the penstock from excessive
water hammer pressure.
Which of the following part of thermal power plant causes maximum energy losses?
d Explanation: About 54% of energy losses occurs in condenser. Losses in boiler and alternator are about 1% and 16% because of such high losses overall efficiency of thermal power plant reduces to 29% for normal old thermal power plant and 50% for modern super critical pressure steam power plant whiRead more
d
See lessExplanation: About 54% of energy losses occurs in condenser. Losses in boiler and
alternator are about 1% and 16% because of such high losses overall efficiency of
thermal power plant reduces to 29% for normal old thermal power plant and 50% for
modern super critical pressure steam power plant which employs many heat saving
devices.
Which of the following is most advantageous and most widely method of solid fuel firing?
b Explanation: The advantages of using pulverised fuel outweigh the disadvantages and all the modern power plants uses pulverised fuel firing method. In pulverised fuel firing better combustion is achieved. Pulverization is a means of exposing a large surface area to the action of oxygen and consequRead more
b
See lessExplanation: The advantages of using pulverised fuel outweigh the disadvantages and
all the modern power plants uses pulverised fuel firing method. In pulverised fuel firing
better combustion is achieved. Pulverization is a means of exposing a large surface area
to the action of oxygen and consequently helping the combustion
Which of the following are the most widely used condensers in modern thermal power plants?
d Explanation: Power plants mostly use surface condensers because from these condensers condensate can be used as feed water requiring less pumping power. In case of jet condensers exhaust steam mixes with the cooling water hence condenses and cooling water are mixed so condensing cannot be recovereRead more
d
See lessExplanation: Power plants mostly use surface condensers because from these
condensers condensate can be used as feed water requiring less pumping power. In
case of jet condensers exhaust steam mixes with the cooling water hence condenses
and cooling water are mixed so condensing cannot be recovered for the use of feed
water.
Which of the following method is used in large modern thermal power plants to heat feed water?
d Explanation: Open and contact type haters are in small power plants. Such heaters recives steam from back pressure turbine. In large modern power plants heaters bleed steam from the main turbine and use it for heating of feed water.
d
See lessExplanation: Open and contact type haters are in small power plants. Such heaters
recives steam from back pressure turbine. In large modern power plants heaters bleed
steam from the main turbine and use it for heating of feed water.
Which of the following particle is bombarded on heavy nucleus of nuclear fuel?
c Explanation: Nuclear fission involvs bombardment of certain particles on heavy nucleus causing it to split. All modern fission reactors uses neutron particles for this purpose because they are neutral in charge and so, they can make their way through the shells of electrons and then through the nuRead more
c
See lessExplanation: Nuclear fission involvs bombardment of certain particles on heavy nucleus
causing it to split. All modern fission reactors uses neutron particles for this purpose
because they are neutral in charge and so, they can make their way through the shells
of electrons and then through the nucleus at low energy