Achiever Study Plan ESE-2018: Power System Quiz 4

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Question 1

Consider two parallel short transmission lines of impedances and respectively. Currents and are both lagging and the sending end voltage is If the reactance to resistance ratio of both the impedances and are equal, then the total current I will

• Alag both and
• Blead both and
• Clag one of and but lead other
• Dbe in phase with both and

Question 2

An air blast circuit breaker is designed to interrupt a transformer magnetising current of 11 A (r.m.s.) chops the current at an instantaneous value of 7 A. If the values of L and C in the circuit are 35.2 H and 0.0023 μF, then the value of voltage that appears across the contacts of the breaker is (Assume that all the inductive energy is transferred to the capacitance)

• A345 KV
• B512 KV
• C866 KV
• D124 KV

Question 3

The operating characteristics of a reactance type distance relay

• Aa stepped waveform for increasing reactance
• Ba straight line for a constant reactance
• Ca circle for a constant reactance
• Da set of circles for variable reactances

Question 4

The prospective voltage across the circuit breaker contacts for a given series inductance, L and shunt capacitance, C is

• Adirectly proportional to (LC)
• Binversely proportional to (LC)
• Cdirectly proportional to
• Dinversely proportional to

Question 5

Power transmission lines are transported to reduce

• ASkin effect
• BFerranti effect
• CTransmission loss
• DInterference with neighbouring communication lines.

Question 6

What sill happen if a short circuit fault occur in a switched capacitor controlled reactor?

• AOscillation
• BCapacitor discharge
• COver voltage
• DNoise

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