# A line trap in carrier current relaying tuned to carrier frequency presents

1.  high impedance to carrier frequency but low impedance to power frequency

2.  low impedance to both carrier and power frequency

3.  high impedance to both carrier and power frequency

4.  low impedance to carrier frequency but high impedance to power frequency

4

high impedance to both carrier and power frequency

Explanation :
No Explanation available for this question

# For the transient, stability of a power system

1.  dδ/dt>0,dP/dδ>0

2.  dδ/dt=0,dP/dδ>0

3.  dδ/dt

4.  dδ/dt

4

dδ/dt<0,dP/dδ=0

Explanation :
No Explanation available for this question

# The load duration curve for a power station is as shown in the above figure. The reserve capacity in the plant at 70% capacity factor is

1.  Zero

2.  10 MW

3.  30 MW

4.  50 MW

4

10 MW

Explanation :
No Explanation available for this question

# The ABCD, constants of a 3-phase transmission line are A = D = 0.8∠10 B = 170∠8500 C = 0.002∠90.40mho The sending end voltage is 400 kV. The receiving end voltage under no-load condition is

1.  400 kV

2.  500 kV

3.  320 kV

4.  417 kV

4

500 kV

Explanation :
No Explanation available for this question

# If a 250 MVA, 11/400 kV three-phase power transformer has leakage reactance of 0.05 per unit on the base of 250 MVA and 'the primary voltage of 11 kV, then the ,actual leakage reactance of the transformer referred to the secondary side of 400 kV is

1.  0.8Ω

2.  0.0032Ω

3.  0.03125Ω

4.  32.0Ω

4

32.0Ω

Explanation :
No Explanation available for this question

# Two 50 Hz generating units operate in parallel within the same power plant and have the following ratings Unit 1 : 500 MVA, 0.85 power factor 20 kV., 3000 rpm H1= 5 MJ/MVA Unit.2 : 200 MVA, 0.9 power factor, 20kV, 150.0 rpm, H2 = 5 MJ/MVA The equivalent inertia constant H in MJ/MVA on 100 MVA base is

1.  2.5

2.  5.0

3.  10.0

4.  35.0

4

35.0

Explanation :
No Explanation available for this question

# The active and the reactive power delivered at the receiving end of a short transmission line of impedance Z ∠ Ψ are respectively given by PR = VSVR/Z cos (Ψ-δ) - VR2/Z COS Ψ and QR = VSVR/Z sin (Ψ-δ) - VR2/Z sin Ψ VS and VR, being the magnitude of voltages at the sending and receiving ends, 8 the power-angle. At the power-limit condition, i.e. for maximum PR:

1.  leading VARS (QR) goes to the load for any values of VS and VR

2.  leading VARS (QR) goes to the load ONLY for VS =VR

3.  lagging VARS (QR) goes to the load for any values of VS and VR

4.  lagging VARs (QR) goes to the load ONLY for VS = VR

4

lagging VARS (QR) goes to the load for any values of VS and VR

Explanation :
No Explanation available for this question

# A three-phase, transformer having zero sequence impedance of Zo has the zero sequence network as shown in the below figure. The connections of its windings are

1.  star-star

2.  delta-delta

3.  star-delta

4.  delta - star with neutral grounded

4

delta-delta

Explanation :
No Explanation available for this question

# In, a 220 kV system, the inductance and capacitance up to the circuit breaker location are 25 mil and 0.025uF respectively. The value of resistor required to be connected across the breaker contacts which will give no transient oscillations, is

1.  25Ω

2.  250Ω

3.  5000Ω

4.  1000Ω

4

5000Ω

Explanation :
No Explanation available for this question

# The operating characteristic of a distance relay in the R-X phase is shown in the above figure. It, represents operating characteristic of a

1.  reactance relay

2.  directional impedance relay

3.  impedance relay

4.  mho relay

4