MCQ_Set-5_Power System Operation & Control

Power system operation and control

Set : 5

41.Full foirm of self GMD is......

A) Geometrical mean distance
B) Geometrical minimum distance
C) Geometrical mean diameter
D) Geometrical minimum diameter

... Answer is A)
Geometrical mean distance

42. What is self GMD for solid round conductor of radius 'R'

A) 0.8877R
B) 0.7788R
C) 0.6556R
D) 0.6695R

... Answer is B)
0.7788R

43. For 180° phase displacement which connection is used ?

A) Yy6, Dd6
B) Yy0, Dd0
C) Dy1, Yd1
D) Dy11, Yd11

... Answer is A)
Yy6, Dd6

44. .... insulation use for more than 180°C.

A) E
B) H
C) C
D) B

... Answer is C)
C type insulation is use for above 180°C

45. Not use for insulation measument.

A) megger
B) insulation tester
C) ohm meter
D) both A & B

... Answer is C)
ohm meter

46. If ten delta is quite low it means.....

A) good insulator
B) good conductor
C) bad insulation
D) bad conductor

... Answer is A)
good insulation

47. Geometrical mean of the distance from one conductor to other is called ........

A) self GMD
B) Mutual GMD
C) Average GMD
D) none of the above

... Answer is B)
Mutual GMD

48. GMR depend on ........

A) size of conductor
B) shape of conductor
C) both
D) none of above

... Answer is C)
both

49. by using Circle diagram we can find.....

A) Active power
B) Reactive power
C) Power angle
D) All

... Answer is D)
All

50. Dielectric strength of good insulating oil is ?

A) 20kV/mm
B) 30kV/mm
C) 40kV/mm
D) 50kV/mm

... Answer is C)
40kV/mm

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