________ relay is preferred for phase fault on short transmission line.

If a transformer is provided with differentially connected relay. To prevent the mal operation of the relay, the relay relay operating coil is biased with ______

A

3rd harmonic

B

2nd harmonic

C

7th harmonic

D

5th harmonic

The given figure shows protection system scheme for one phase of generator. A high resistance fault occurs near the neutral end with the current distribution as marked. The slope of the relay is 10% and pick-up current of 0.15A. The CT ratio is 500/5. Will the relay operate under given circumstances?

A

True

B

False

If the transmission co-efficient T₁ of a transmission line is 1.333 and the characteristic impedance of the λ/4 transmission line used is 100Ω, then the characteristic impedance of the transmission line is:

A

50Ω

B

100Ω

C

70.71Ω

D

None of the mentioned

If a transformer is provided with differentially connected relay. To prevent the mal operation of the relay, the relay restraining coil is biased with ______________

A

3rd harmonic

B

2nd harmonic

C

7th harmonic

D

5th harmonic

What is the phase current in phase Y and in phase B out of R-Y-B when sudden short circuit to all three phases occurs at no load? It is given that after fault current in phase R is equal (Vm Sin ωt)

A

Y = Vm Sin(ωt +60°) & B = VmSin(ωt +120°)

B

Y = Vm Sin(ωt +120°) & B = VmSin(ωt+240°)

C

Y = Vm Sin(ωt +240°) & B = Vm Sin(ωt +120°)

D

Y = Vm Sin(ωt +90°) & B = Vm Sin(ωt -90°)

The fault which is the result of both fault scarps and fault-line scarps is?

A

Compound-fault scarps

B

Composite-fault scarps

C

Dual-fault scarps

D

By-fault scarps

For a lossy transmission line, γ=0.02+j0.15 and is 20m long. The line is terminated with an impedance of a 400Ω. Then the input impedance of the transmission line given that the characteristic impedance of the transmission line is 156.13+j11.38Ω is:

A

100+j50 Ω

B

228+j36.8 Ω

C

50+36.8j Ω

D

none of the mentioned

Calculate the value of the fault impedance if the fault voltage is 2 V and fault current is 4 A.

A

.5 ohm

B

.2 ohm

C

.4 ohm

D

.6 ohm

The fault not belonging to the classification of fault with the attitude of fault as basis ___________

A

Heave fault

B

Strike fault

C

Dip fault

D

Oblique fault

The fault where fault strike is parallel to the dip of the layers broken and disrupted by the fault?

A

Dip faults

B

Strike faults

C

Oblique faults

D

Hade faults

________ relay is preferred for phase fault on short transmission line.

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