01.Which distribution system is more reliable?
Ring main system.
02.The insulation resistance test is performed on power line with
meggar.
03.The power output from an hydroelectric power plant depends on
discharge, head and system efficiency.
04.In hydroelectric power plants
Operating cost is low and initial cost is high.
05.The flow duration curve at a given head of a hydroelectric plant is used to determine
total power available at the site.
06.In high head hydroelectric power plant, the velocity of water flow in penstock is around
7 m/s.
07.The function of a surge tank is to
relieve water hammer pressures in the penstock pipe.
08.The maximum head of a Kaplan turbine is limited to
25 m.
09.The pumped storage scheme is employed to supply
during the peak hours.
10.High tension cables can be used for transmission of voltage upto
66 kv.
11.With the increase in transmission voltage, the volume of the conductor will
decrease.
12.Alternator are rated in
KVA.
13.A thermal plant has an efficiency of about
30%.
14.High voltage transmission is recommended because it
Reduces the cross-section area of the conductor.
15.The permissible variation in supply frequency is
+ 5%.
16.Series reactors are used to :
bring down the fault level within the capacity of the switchgear.
17.SF6 gas is transported in
liquid form in cylinders.
18.Plug setting of an electromagnetic relay can be altered by varying
number of ampere turns.
19.The most efficient torque– producing actuating structure for induction-type relays is
induction-cup structure.
20.Buchholz relay to
connected in the pipe connecting main tank of transformer and conservator.
21.The Buchholz protects a transformer from
types of internal faults.
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