(a) Is cheapest in initial as well as maintenance cost
(b) Provide simple operation and relaying system
(d) All of the above
Ans. (d) All of the above
Q.2. In a single bus bar system there will be complete shutdown when
(a) Fault occurs on the bus itself
(b) Fault occurs on neutral line
(c) Two or more faults occur simultaneously
(d) Fault occurs with respect to earthing
Ans. (a) Fault occurs on the bus itself
Q.3. The main factor in favour of the use of aluminum as bus-bar material is its
(a) Low-cost
(b) Low-density
(c) Low melting point
(d) High resistivity
Ans. (a) Low-cost
Q.4. Double bus-bar arrangement makes use of two identical bus and has the advantages that
(a) It does not require any bus coupler and permits switchover from one bus to another whenever desired
(b) It provides maximum flexibility and reliability
(c) Either bus-bar may be taken up for maintenance
(d) All of the above
Ans. (d) All of the above
Q.5. The voltage of a particular bus is regulated by controlling the
(a) Active power of the bus
(b) Reactive power of the bus
(c) Phase angle
(d) Phase angle and reactive power
Ans. (d) Phase angle and reactive power
Q.6. The voltage of a particular bus can be controlled by controlling the
(a) Active power of the bus
(b) Reactive power of the bus
(c) Phase angle
(d) Both A and B
Ans. (b) Reactive power of the bus
Q.7. In a power system the maximum number of buses are
(a) Generator buses
(b) Load buses
(c) Slack buses
(d) P-V buses
Ans. (b) Load buses
Q.8. YBUS as used in load flow study, and ZBUS as used for short circuit study are:
(a) The same
(b) Inverse of each other
(c) Are not related to each other
(d) None of the above
Ans. (c) Are not related to each other
Q.9. Surge absorbers are used for protection against
(a) High-voltage low-frequency oscillations
(b) High-voltage high-frequency oscillations
(c) Low-voltage high-frequency oscillations
(d) Low-voltage low-frequency oscillations
Ans. (c) Low-voltage high-frequency oscillations
Q.10. Surge absorber ...... the energy of travelling waves
(a) Absorbs
(b) Reflects
(c) Diverts
(d) Partly absorbs and partly diverts
Ans. (d) Partly absorbs and partly diverts
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