Power System Operation and Control Mid - II, November - 2014

1.The unit for speed regulation of governer is
  • HZ
  • HZ/MVA
  • HZ/MW
  • none of the above
Answer: C
2.The speed regulation D for a large size alternator is about
  • 10 HZ/MW
  • 5 HZ/Mw
  • 1 HZ/MW
  • 0.02 HZ/MW
Answer: D
3.The rate of drop in frequency of control inlet valve due to an increase in generation of power (dPG) on prime mover is called
  • speed regulation
  • speed efficiency
  • governer operation
  • none of the above
Answer: A
4.What is the condition for uncontrolled case in a two area system
  • ΔPc1=0
  • ΔPc2=0
  • ΔPc1=ΔPc2=0
  • none of the above
Answer: C
5.Two alternators are running in parallel. If the field of one of the alternator is adjusted it will
  • reduces its speed
  • change its load
  • change its p.f.
  • change its frequency
Answer: C
6.The synchronizing coefficient between two areas of a two area power system is
  • A
  • B
  • C
  • D
Answer: C
7.Frequency of the resonant vibrations lies in the range of
  • 50-100 Hz
  • 10-20 Hz
  • 100-200 Hz
  • none of the above
Answer: A
8.Steady state frequency error in a single control area can be eliminated by
  • proportional control
  • integral control
  • derivative control
  • proportional + derivative control
Answer: C
9.Shunt capacitance is usually neglected in the analysis of
  • short transmission lines
  • medium transmission lines
  • long transmission lines
  • medium as well as long lines
Answer: A
10.For the same voltage boost, reactive power capacity is more for a
  • shunt capacitor
  • series capacitor
  • same for both
  • none of the above
Answer: A
11.For a good voltage profile under no-load condition, a long line needs _________________ at receiving end.
Answer: Shunt Reactor
12.For a small KVAR requirements ____________________ is more economical.
Answer: Static Or Shunt Capacitor
13.The series compensation increase ______________________.
Answer: Stability Limit
14.For a lumped inductive load with increase in supply frequency, P ________________ and Q ____________________.
Answer: Decreases, Increases
15.The unit of frequency bias parameter is _______________________.
Answer: No units
16.If the two areas are identical, the relation between two line powers is ________________
Answer: P tie,1 = -P tie,2
17.If we are interconnecting two areas, the steady state frequency error is ______________ by 50%.
Answer: Reduced
18.Load frequency control is achieved by properly matching the individual machines _____________.
Answer: Turbine Inputs
19.Load frequency control uses ______________________control.
Answer: Both Proportional And Derivative Control
20.For stability and economical reasons, we operate the transmission lines with power angle in the range ______________________.
Answer: 300 TO 450