(a) Bars
(b) Rods
(c) Tubes
(d) Any of the above
Ans. (d) Any of the above
Q.2. A bus-bar is rated by
(a) Current only
(b) Voltage only
(c) Current, voltage, frequency and short circuit current
(d) Current, voltage and frequency
Ans. (c) Current, voltage, frequency and short circuit current
Q.3. The material used for bus-bar should have
(a) Low resistivity
(b) Low-cost
(c) High softening temperature
(d) All of the above
Ans. (d) All of the above
Q.4. Which of the following bus-bar schemes has the lowest cost?
(a) Ring bus-bar scheme
(b) Single bus-bar scheme
(c) Breaker and a half scheme
(d) Main and transfer scheme
Ans. (b) Single bus-bar scheme
Q.5. Which of the following can be used for bus-bars?
(a) Tubes
(b) Bars
(c) Rods
(d) Any of the above
Ans. (d) Any of the above
Q.6. Due to which of the following reasons aluminum is being favoured as bus-bar material?
(a) Low-density
(b) Low-cost
(c) Ease of fabrication
(d) None of the above
Ans. (b) Low-cost
Q.7. Which of the following bar schemes is the most expensive?
(a) Double bus-bar double breaker
(b) Ring bus-bar scheme
(c) Single bus-bar scheme
(d) Main and transfer scheme
Ans. (a) Double bus-bar double breaker
Q.8. When an alternator connected to the bus-bar is shut down the bus-bar voltage will
(a) Fall
(b) Rise
(c) Remain unchanged
(d) None of the above
Ans. (c) Remain unchanged
Q.9. The bus-bar zone, the purpose of protection includes ......, ...... and ......
(a) Bus-bars, isolating switches, circuit breakers
(b) Transformers, relays, circuit breakers
(c) Transformers, conductors and relays
(d) None of the above
Ans. (a) Bus-bars, isolating switches, circuit breakers
Q.10. If a voltage controlled bus is treated as a load bus, then which one of the following limits would be violated?
(a) Voltage
(b) Active power
(c) Reactive power
(d) Phase angle
Ans. (a) Voltage
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