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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