PSOC MCQ (GTU Electrical Engineering SEM 8 )

PSOC MCQ (GTU Electrical Engineering SEM 8)

PSOC GTU MCQ (Electrical Engineering SEM 8)

Q1. For stability and economic reasons we operate the transmission lines with power angle in the range (in degrees):

a. 10 to 25 

b. 30 to 45

c. 60 to 75 

d. 65 to 80

Q2. Permissible change in power frequency is

a. ± 0.5 Hz

b. ± 1 Hz

c. ± 5 Hz

d. . ± 10 Hz

Q3. An operationally secure power system is one with

a. Low probability of system blackout

b. Medium probability of system blackout

c. High probability of system blackout

d. Zero probability of system blackout

Q4. Energy management system ensures

a. Minimum cost

b. Minimum environment cost

c. High security

d. All of the above

Q5. Energy control center is supposed to perform the following security functions

a. System monitoring

b. Contingency analysis

c. Corrective action analysis

d. All of the above

Q6. Contingency analysis provides operating constrains to be employed in

a. Economic dispatch

b. Unit commitment

c. Emission dispatch

d. (a) and (c) both

Q7. Voltage stability problems normally occurs

 

a. Heavily stressed system

b. Medium stressed system

c. Low stressed system

d. None of the above

Q8. Voltage stability is basically

a. Generator stability

b. Load stability

c. Transformer stability

d. None of the above

Q9. For prevention / containment of voltage instability are

a. Generator transformer tap value may be increased

b. Q injection should be carried be carried pot an appropriate location

c. Load end OLTC (on-load tap changer) should be suitably used

d. All of the above

Q10. Voltage stability can be improved

a. Enhancing the localized reactive power support (SVC)

b. Compensating line reactance

c. Enhancing the excitation system of generator

d. All of the above

Q11. A security analysis program normally uses

a. DC load flow

b. AC load flow

c. AC – DC load flow

d. Any of the above

Q12. A power system is operationally secure means

a. It is safe from lightening strokes

b. It is safe against switching surges

c. All line flows and load bus voltages are within limit

d. The operating cost is minimum

Q13. A power system has secure and economic operation implies that

a. Operating cost is minimum subject to emission constraints

b. Operating cost is minimum subject to line flow constraints

c. Magnitudes of line flows are minimum

d. Transmission real power losses are minimum

Q14. Contingency definition gives the list of component outages

a. Which includes the contingencies with high probability of occurrence

b. Which provides the contingency in decreasing order of severity

c. For outage simulation

d. Any one of the above

Q15. Contingency selection is usually performed using DC power flow model because

a. Accurate results are required

b. Limited accuracy results are required

c. Masking is to be removed

d. All of the above

Q16. Line outage distribution factors are primarily useful for

a. System monitoring

b. Contingency definition

c. Contingency selection

d. Security control

Q17. Allowed voltage variation is

a. ± 10 %

b. ± 5 %

c. ± 15 %

d. any value

Q18. Which of the following leads to voltage to voltage instability

a. Transfer of reactive power

b. Transfer of active power

c. Transfer of complex power

d. Transfer of apparent power

Q19. A long line with no load

a. Generates capacitive reactive power

b. Generates inductive reactive power

c. Does not generate any power

d. Generates both active and reactive power

Q20. A synchronous condenser (dynamic compensator)

a. Decrease short circuit capacity

b. Increase short circuit capacity

c. Has no effect on short circuit capacity

d. Is nothing but synchronous motor running at no load

Q21. Effect of HVDC transmission in power system

a. Improves voltage stability

b. Causes voltage collapse

c. Has no effect

d. None of the above

Q22. For distortion less line the surge impedance is given by 

a. (Z*Y)

b. (Z*Y)2

c. (Z/Y)0.5

d. (Z/Y)2

Q22. The characteristic impedance of a distortion less line is

a. Real

b. Inductance

c. Capacitive

d. Complex

Q23. At SIL, no____________ is absorbed or generated at either of the two ends of the line.

a. Real power

b. Reactive power

c. Apparent power

d. Complex power

Q24. At SIL, the power factor is

a. Lagging

b. Leading

c. Unity

d. None of the above

Q25. The unit of natural power of the line is

a. MW

b. MVAR

c. MVA

d. None of the above

Q26. At Surge Impedance Loading, the relation between voltages at sending end and receiving 

end is given by

a. VS>VR

b. VS<VR

c. VS=VR

d. None of the above

Q27. The series reactive losses increase 

a. Inversely with V2

b. Inversely with V3

c. Inversely with V

d. None of the above

Q28. The voltage and current of the uncompensated line at no load 

_______________and___________ respectively, as line length increases.

a. Increases, decreases

b. Decreases, increases

c. Remains constant, increases 

d. None of the above

Q29. If the terminal voltage of the synchronous tie is not equal at its two ends, the point of highest voltage is at

a. The middle of the line

b. Nearer to the sending end

c. Nearer to the receiving end

d. Nearer to the end which has higher system voltage

Q30. For operation of a transmission line under heavy loading condition, the load power factor 

also governs

a. The receiving end voltage

b. The critical receiving end voltage

c. both (a) and (b)

d. None of the above

Q31. The receiving end voltage is extremely sensitive to any change in _______ status at the 

receiving end bus.

a. Real power

b. Reactive power

c. Apparent power

d. None of the above

Q32. The power transmission systems are termed as “weak”, if source reactance is __________and nodal short-circuit strengths are _________.

a. High, low

b. High, high

c. Low, low

d. Low, high

Q33. At the steady state limit of the line, the value of power angle δ is (in degrees)

a. < 90

b. > 90

c. = 90

d. None of the above

Q35. For a power system with depressed receiving end voltage, the line ___________.

a. Supplies reactive power

b. Demands reactive power

c. (a) or (b)

d. None of the above

Q36. With higher level of real power loading, reactive power demand of the system 

a. Increases sharply

b. Decreases sharply

c. Remains constant

d. None of the above

Q37. Voltage regulation of the transmission line is particularly sensitive to _______demand of the system.

a. Active power

b. Apparent power

c. Reactive power

d. None of the above

Q38. Among the following methods, which is not the countermeasure for reactive power deficit?

a. Generator terminal voltage increase

b. Strategic load shedding

c. Reactive power boost

d. Shunt reactors

Q39. By studying power system failures in the past in several countries, it has been observed that disturbance in most cases usually starts from

a. The distribution system

b. The transmission system

c. The generation system

d. (a) and/ or (b)

Q40. Practical aspect for describing the reactive power flow problem in voltage collapse :

a. Long transmission line

b. Radial transmission lines

c. High voltage problem

d. All of the above

Q41. With reference to transformer tap changing, timing of transformer tap changing should be graded such that the ___________ the voltage, the ____________ is the tap changing.

a. higher, faster

b. lower, faster

c. lower, slower

d. higher, slower

Q42. A power system operating where by meeting all the loads and equality and inequality constraints are satisfied may have an operating level

a. Secure

b. Correctively secure

c. Alert

d. Either (a) or (b) or (c)

Q43. Voltage stability can be improved by adopting

a. Use of HVDC tie between regional grids

b. Enhancing excitation of generator

c. FACTS devices 

d. All of the above

Q44. With respect to power system operating states, the system is said to be normal if

a. All the loads are met

b. The frequency and bus voltage magnitudes are within the prescribed limits

c. No components of power system are overloaded

d. All of the above

Q45. The advantage of digital LF controllers

a. More accurate

b. Reliable

c. Compact in size

d. All of the above

Q46. Most of the Reheat units have a Generation Rate around

a. 3 %

b. 10 %

c. 0 %

d. Infinity

Q47. The internal derivative feedback loop in Automatic Voltage Control is provided by 

a. Error amplifier

b. Potential transformer

c. Stabilizing transformer

d. SCR power amplifier and exciter field

Q48. In two area load frequency control, state variables are

a. 10

b. 9

c. 7

d. None of the above

Q49. Among all which is not the component of Alternator Voltage Regulator?

a. Error amplifier

b. Speed governor system

c. Potential transformer

d. SCR power amplifier and exciter field

Q50. For which of the following system, the voltage levels are maintained by drawing of the reactive power reserves of the systems’ controllable plant

a. Sub-transmission system

b. Distribution system

c. Transmission system

d. None of the above

Q51. Load shedding is possible through which of the following?

a. Switching of the loads

b. Frequency reduction

c. Voltage reduction

d. Any of the above

Q52. The voltage regulation of flat voltage profile system is

a. 100 %

b. 50 %

c. 0 %

d. Any of the above

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