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Electrical Engineering Objective Questions { Power System }



169. Void formation in the dielectric material of an underground cable may be controlled by
A. using a high permitivity solid dielectric
B. providing a strong metallic sheath outside the cable
C. filling oil at high pressure as dielectric
D. none of these
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170. An ACSR conductor having 7 steel strands and 24 aluminium conductors surrounding the steal strands is called
A. 24/7 ACSR
B. 7/24 ACSR
C. 31/7 ACSR
D. 7/31 ACSR
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171. Which of the following condition relates the line resistance R and line reactance X for maximum steady state power transmission on a transmission line?
A. X = R
B. R = ,ri x
C. x =R
D. X = R/
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172. For transmission line span of 21, horizontal tension at tower supports is T and weight of conductor/unit length is w. The maximum sag equals(a) X = R
A. R = ,ri x
B. x =
C.R
D. X = R/
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173. Proximity effect is due to current flowing in the
A. earth
B. sheath
C. neighbouring conductor
D. all of these
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174. Equal area criterion is applicable to an electric system if the system consists of
A. only one machine swinging with respect to an infinite bus
B. at least two machines swinging with respect to an infinite bus
C. at least three machines swinging with respect to an infinite bus
D. none of these
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175. Impedance relays can be used for
A. phase faults only
B. earth faults only
C. both phase and earth faults
D. none of these
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