Power Systems Objective Questions & Answers – Set 15

If a fault occurs on any feeder, the fault current is

NTPC (National Thermal Power Cooperation) has its only thermal power generating unit in West Bengal at

Recovery voltage in CB is equal to

Which of the following material is not used as fuse element?

The line current IR flowing into balanced delta connected load is - j5 - 3 A. If the phase sequence is R_YB the phase current I_YB is

Switchgear equipment include

In a three-phase system, when the loads are perfectly balanced, the neutral current is

Keeping in view the cost and overall effectiveness, the following circuit breaker is suited for capacitor bank switching

A three phase, 33 kV oil circuit breaker is rated 1200 A, the symmetrical breaking capacity is 2000 MVA, 3 secs. Then the making capacity is

A three phase, 33 kV oil circuit breaker is rated 1200 A, 2000 MVA, 3 secs. The symmetrical breaking current is

In relay coil which is used?

If the fault current is 2000 A, the relay setting is 50% and CT ratio is 400 : 5, then plug setting multiplier will be

MCB stands for

Where air circuit breakers are used?

Percentage of carbon is highest in

On what factor does the performance of a circuit breaker depend?

Oxide film arrestor has which of the following properties?

The pickup value of relay is 6.5 Amp and fault current in relay coil is 39 Amp. Its plug setting multiplier is

On a power system network the load is increasing represents the value of impedance

Current chopping mainly occurs in

Calorific value of solid fuel is expressed as

A loss less transmission line having surge impedance loading (SIL) of 2280 MW is provided with a uniformly distributed series capacitive compensation of 30 %. Then SIL of compensated transmission line will be

Fusing factor =

India’s largest thermal power station is located at

The positive sequence reactance will be equal to negative sequence if the equipment is

The rating of CB is in terms of

A fuse wire of circular cross-section has a radius of 0.8 mm. The wire blows off at an current of 8 Amp. Calculate the radius of wire that will blow off at an current of 1 amp?

A 3-phase breaker is rated at 2000 MVA, 33 kV, its making current will be

Cheapest plant in operation and maintenance is

A CT is connected in ___________________ with the line.