Important Paper Electrical engineering
1. Find the current rating for the following system. An outdoor pole-mounted 11kV/415V substation has to be installed for supply to an area having a load of 63kVA.
(1) 50 A
(2) 88 A
(3) 72 A
(4) 65 A
Ans (2)
2. A term is given to a 30 km transmission line which carries power at 33kV. What is the term ?
(1) Short transmission line
(2) Long transmission line
(3) High power line
(4) Ultra high voltage line
Ans (1)
3. For which of the following the excitation control method is satisfactory ?
(1) High voltage lines
(2) Short line
(3) Long line
(4) Low voltage lines
Ans (2)
4. In overhead transmission lines, the effect of capacitance can be neglected when the length of the line is less than
(1) 80 Km
(2) 110 Km
(3) 150 Km
(4) 200 Km
Ans (1)
5. In the analysis of short transmission lines, which of the following is neglected ?
(1) I2R loss
(2) Shunt admittance
(3) Series impedance
(4) All of the above
Ans (2)
6. For distortion less transmission line
(1) R/L = G/C
(2) RL = GC
(3) RG = LC
(4) RLGC = 0
Ans (1)
7. Which type of transmission line has length up to 80 km ?
(1) Short transmission line
(2) Medium transmission line
(3) Long transmission line
(4) Flexible transmission line
Ans (1)
8. Power is to be transmission over a large distance, say, 200 km. The requisite transmission voltage must be -
(1) 33 kV
(2) 132 kV
(3) 66 kV
(4) 11kV
Ans (2)
9. When the sender's end voltage is more, the power transmitted -
(1) will be minimum
(2) will be zero
(3) will be unpredictable
(4) will be maximum
Ans (4)
10. A balanced 3-phase, 3-wire supply feeds balanced stra connected resistors. If one of the resistors is disconnected, then the percentage reduction in load will be
(1) 33.33
(2) 50
(3) 66.67
(4) 75.
Ans (2)
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