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Practice Test: Question Set - 09


1. Which of the following materials is not used for transmission and distribution of electrical power?
    (A) Copper
    (B) Aluminium
    (C) Steel
    (D) Tungsten

2. The usual spans with R.C.C. poles are
    (A) 40-50 meters
    (B) 60-100 meters
    (C) 80-100 meters
    (D) 300-500 meters

3. The operating voltage of super-tension cables is up to
    (A) 3.3 kV
    (B) 6.6 kV
    (C) 11 kV
    (D) 33 kV

4. A booster is a
    (A) Series wound generator
    (B) Shunt wound generator
    (C) Synchronous generator
    (D) None of the above

5. For an overhead line, the surge impedance is taken as
    (A) 20-30 ohms
    (B) 70-80 ohms
    (C) 100-200 ohms
    (D) 500-1000 ohms

6. Which of the following relays is used on long transmission lines?
    (A) Impedance relay
    (B) Mho's relay
    (C) Reactance relay
    (D) None of the above

7. Which of the following regulations is considered best?
    (A) 50 %
    (B) 20 %
    (C) 10 %
    (D) 2 %

8. Aluminium has a specific gravity of
    (A) 1.5
    (B) 2.7
    (C) 4.2
    (D) 7.8

9. For transmission of power over a distance of 500 km, the transmission voltage should be in the range
    (A) 150 to 220 kV
    (B) 100 to 120 kV
    (C) 60 to 100 kV
    (D) 20 to 50 kV

10. The frequency of voltage generated, in case of generators, can be increased by
    (A) Using reactors
    (B) Increasing the load
    (C) Adjusting the governor
    (D) Reducing the terminal voltage

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