Power system MCQ #6

Power system MCQ 76 to 80:

91) The effect of capacitance can be neglected ________?
      (a) Short transmission lines
      (b) Medium transmission lines
      (c) Long transmission lines
      (d) All of these

92) What are the values of A, B, C, D parameters of a short transmission line?
      (a) Z, 0, 1, 1
      (b) 1, 1, Z, 0
      (c) 1, Z, 0, 1
      (d) 0, 1, 1, 1

93)  Which among the following relation is true for a transmission line?
      (a) –AB + CD = 1
      (b) –AD + BC = 1

      (c) AB – CD = -1
      (d) AD + BC = 1

94) A line of what length can be classified as a medium transmission line?
      (a) 90 – 100 km
      (b) 150 – 200 km 
      (c) 50 – 150 km
      (d) Above 200 km

95) When is the Ferranti effect on the long transmission lines experienced?
      (a) The line is heavily loaded.
      (b) The power factor is unity.
      (c) The line is fully loaded.
      (d) The line is lightly loaded.

ANSWER: | 91-a | 92-c | 93-b | 94-c | 95-d |

Power system MCQ 96 to 100:

96)  The thickness of insulation layer provided on the conductor, in cables depend on_______.
      (a) Operating voltage
      (b) Power factor
      (c) Current to be carried
      (d) All of these

97) In which ______ climate the chances of occurrence of corona is maximum?
      (a) Dry
      (b) Humid
      (c) Winter
      (d) Hot summer

98) The hollow conductors are used because _______?
      (a) Improve stability
      (b) Reduce the weight of copper
      (c) Reduce corona
      (d) Increase power transmission capacity

99) Which tests are conducted to locate the fault location in the cables?
      (a) Varley loop test
      (b) Murray loop test
      (c) Both (a) and (b)
      (d) None of these

100) Which part of thermal power plant causes maximum energy losses?
      (a) Condenser
      (b) Alternator
      (c) Boiler
      (d) Ash and unburnt carbon

ANSWER: | 96-a | 97-b | 98-c | 99-c | 100-a |

Power system MCQ 101 to 105:

101) The sending end voltage of the transmission line controls the

      (a) Reactive power

      (b) Active power

      (c) (a) and (b) both

      (d) None of the above

102) The frequency of the power system control the

      (a) Active power

      (b) Reactive power

      (c) (a) and (b) both

      (d) None of them

103) What is the unit of constant D?

      (a) ohm

      (b) mho

      (c) henry

      (d) none of the above

104) In case of parallel wires, the visual corona begins

      (a) At disruptive critical voltage

      (b) At lower voltage than disruptive critical voltage

      (c) At visual critical voltage which is higher than disruptive critical voltage

      (d) None of the above

105) The voltage stress in maximum in the cable

      (a) At the surface of the sheath

      (b) At the surface of the armouring

      (c) At the surface of the insulator

      (d) At the surface of the conductor

ANSWER: | 101-a | 102-a | 103-d | 104-c | 105-d |