1) The main objective of energy management is to
a. Minimize energy cost
b. Minimum environmental effects
c. Maintain optimum energy procurement and utilization
d. Only A and B
e. All of these
2) Which is the major energy source to meet the Indian
energy demand?
a. Coal
b. Oil
c. Natural gas
d. Lignite
3) Which country has the biggest coal reserves?
a. Russia
b. US
c. China
d. India
4) In the given options, the non-commercial source of
energy is
a. Coal
b. Lignite
c. Firewood
d. Refined petroleum products
5) Which of the following circuit breakers has the
lowest operating voltage?
a. SF6 circuit breaker
b. Air break
c. Air blast
d. Minimum oil circuit breaker
6) On what factor does the operating speed of the
relay depend?
a. Rate of flux built up
b. Armature core air gap
c. Spring tension
d. All of these
7) Protective relays can be designed to respond to
___________.
a. Light intensity, impedance
b. Temperature, resistance, reactance
c. Voltage and current
d. All of these
8) What is the purpose of back up protection?
a. To increase the speed
b. To increase the reach
c. To leave no blind spot
d. To guard against failure of primary
9) A _________ distribution system is more reliable than the ______
distribution system.
a) parallel, radial
b) parallel, ring
c) radial, parallel
d) ring, parallel
10) What is infinite bus in power system?
a. A large system with infinite voltage
b. A large system in which the voltage and frequency varies
c. A large system whose voltage and frequency remains constant
throughout.
d. Both (a) and (b)
e. None of these
11) What is the simplified diagram called, after
omitting all resistances, static loads, capacitance of the transmission
lines and magnetising circuit of the transformer?
a. Single line diagram
b. Resistance diagram
c. Reactance diagram
d. Both (a) and (b)
e. None of these
12) Which of these systems uses the 3 phase 4 wire system?
a. Primary distribution
b. Secondary distribution
c. Primary transmission.
d. Secondary transmission.
13) Which component connects the substation to the area
where power is to be distributed?
a. Distributors
b. Service mains
c. Feeders
d. All of these
14) Name the cable which connects the distributor to
the consumer terminals.
a. Distributors
b. Service mains
c. Feeders
d. All of these
15) Assertion (A): Transmission of electrical power by dc is
economical than that with ac.
Reason (R): In case of dc transmission, there is no charging
current which contributes to the continuous load, even on no load.
a. Both A and R are true and R is the correct explanation of A
b. Both A and R are true and R is not the explanation of A
c. A is true but R is false
d. A is false but R is true.
16) Line efficiency increases for ___________________ transmission
voltages.
a. Higher.
b. Lower.
c. Both (a) and (b)
d. None of these.
17) The most important disadvantage of using the high voltage for
transmission is
a. The increased cost of insulating the conductors.
b. The increased cost of transformers, switchgear and the other
terminal apparatus.
c. Both (a) and (b).
d. There is a reduction in the corona loss.
18) A bus-bar is rated by
A. Current only
B. Voltage only
C. Current , voltage and frequency
D. Current, voltage, frequency and short circuit current
19) The material used for bus-bar should have
A. Low resistivity
B. Low-cost
C. High Softening temperature
D. All of the above
20)
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
22) Which of the following can be used for bus-bars?
A. Tubes
B. Rods
C. Bars
D. Any of the above
23)
Due to which of the following reasons aluminium is being favoured as
bus-bar material?
A. Low-density
B. Low-cost
C. Ease of fabrication
D. None of the above
24)
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
25)
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
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