Transmission and Distribution Electrical Practice Test - Set 01

Practice Test: Question Set - 01


1. A 3-phase 4-wire system is commonly used on
    (A) Primary transmission
    (B) Secondary transmission
    (C) Primary distribution
    (D) Secondary distribution

2. A conductor, due to sag between two supports, takes the form of
    (A) Semicircle
    (B) Triangle
    (C) Ellipse
    (D) Catenary

3. A circuit is disconnected by isolators when
    (A) Line is energized
    (B) There is no current in the line
    (C) Line is on full load
    (D) Circuit breaker is not open

4. The use of strain type insulators is made where the conductors are
    (A) Dead ended
    (B) At intermediate anchor towers
    (C) Any of the above
    (D) None of the above

5. Constant voltage transmission entails the following disadvantage
    (A) Large conductor area is required for same power transmission
    (B) Short-circuit current of the system is increased
    (C) Either of the above
    (D) None of the above

6. The angular displacement between two interconnected stations is mainly due to
    (A) Armature reactance of both alternators
    (B) Reactance of the interconnector
    (C) Synchronous reactance of both the alternators
    (D) All of the above

7. When a live conductor of public electric supply breaks down and touches the earth which of the following will happen?
    (A) Current will flow to earth
    (B) Supply voltage will drop
    (C) Supply voltage will increase
    (D) No current will flow in the conductor

8. Which of the following are the constants of the transmission lines?
    (A) Resistance
    (B) Inductance
    (C) Capacitance
    (D) All of the above

9. Due to which of the following reasons the cables should not be operated too hot?
    (A) The oil may loose its viscosity and it may start drawing off from higher levels
    (B) Expansion of the oil may cause the sheath to burst
    (C) Unequal expansion may create voids in the insulation which will lead to ionization
    (D) All of the above

10. The loads on distributors systems are generally
    (A) Balanced
    (B) Unbalanced
    (C) Either of the above
    (D) None of the above

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Item Reviewed: Transmission and Distribution Electrical Practice Test - Set 01 Rating: 5 Reviewed By: Pranab Debnath
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