Economics Of Power Generation Objective Questions
1.In Hopknison demand rate or two parttariff the demand rate or fixed charges are
dependent upon the energy consumed
dependent upon the maximum demand of the consumer
both (a) and (b)
neither (a) nor (b)
ANSWER : : dependent upon the maximum demand of the consumer
2.Power plant having maximum demand more than the installed rated capacity will have utilisation factor
equal to unity
less than unity
more than unity
none of the above
ANSWER : : more than unity
3.Which plant can never have 100 percent load factor ?
Peak load plant
Base load plant
Nuclear power plant
Hydro electric plant
ANSWER : : Peak load plant
4.Maximum demand on a power plant is
the greatest of all “short time interval averaged” demand during a period
instantaneous maximum value of kVA supplied during a period
both (a) or (b)
none of the above
ANSWER : : the greatest of all “short time interval averaged” demand during a period
5.The area under a load curve gives
average demand
energy consumed
maximum demand
none of the above
ANSWER : : energy consumed
6.Annual operating expenditure of a power plant consists of
fixed charges
semi-fixed charges
running charges
all of the above
ANSWER : : all of the above
7.Load factor of a power station is generally
equal to unity
less than unity
more than unity
equal to zero Diversity factor is always
ANSWER : : less than unity
8.Annual depreciation cost is calculated by
sinkingfund method
straight line method
both (a) and (b)
none of the above
ANSWER : : both (a) and (b)
9.High load factor indicates
cost of generation per unit power is increased
total plant capacity is utilised for most of the time
total plant capacity is not properly utilised for most of the time
none of the above
ANSWER : : total plant capacity is utilised for most of the time
10.Annual instalment towards depreciation reduces as rate of interest increases with
sinking fund depreciation
straight line depreciation
reducing balances depreciation
none of the above
ANSWER : : sinking fund depreciation
11.Which of the following generating station has minimum ruining cost ?
Nuclear
Hydro
Thermal
Diesel
ANSWER : : Hydro
12.A consumer has to pay lesser fixed charges in
flat rate tariff
two part tariff
maximum demand tariff
any of the above
ANSWER : : maximum demand tariff
13.Diversity factor has direct effect on the
fixed cost of unit generated
running cost of unit generated
both (a) and (b)
neither (a) nor (b)
ANSWER : : fixed cost of unit generated
14.Depreciation charges are high in case of
thermal plant
diesel plant
hydroelectric plant
thermal plant
ANSWER : Demand factor is defined as
15.In two part tariff, variation in load factor will affect
fixed charges
operating or running charges
both (a) and (b)
either (a) or (b)
ANSWER : : operating or running charges
16.Annual depreciation as per straight line method, is calculated by
the capital cost divided by number of year of life
the capital cost minus the salvage value, is divided by the number of years of life
increasing a uniform sum of money per annum at stipulated rate of interest
none of the above
ANSWER : : the capital cost minus the salvage value, is divided by the number of years of life
17.A load curve indicates
average power used during the period
average kWh (kW) energy consumption during the period
either of the above
none of the above
ANSWER : : average kWh (kW) energy consumption during the period
18.Load curve helps in deciding
total installed capacity of the plant
sizes of the generating units
operating schedule of generating units
all of the above
ANSWER : : all of the above
19.Load curve is useful in deciding the
operating schedule of generating units
sizes of generating units
total installed capacity of the plant
all of the above
ANSWER : : all of the above
20.Annual depreciation of the plant it proportional to the earning capacity of the plant vide
sinking fund depreciation
straight line depreciation
reducing balances depreciation
none of the above
ANSWER : : reducing balances depreciation
21.The load factor of domestic load is usually
10 to 15%
30 to 40%
50 to 60%
60 to 70%
ANSWER : : 10 to 15%
22.Salvage value of the plant is always
positive
negative
zero
any of the above
ANSWER : : any of the above
23.For high value of diversity factor, a power station of given installed capacity will be in a position to supply
less number of consumers
more number of consumers
neither (a) nor (b)
either (a) or (b)
ANSWER : : more number of consumers
24.Low power factor is usually not due to
arc lamps
induction motors
fluorescent tubes
incandescent lamp
ANSWER : : incandescent lamp
25.In ______ fuel transportation cost is least.
nuclear power plants
diesel generating plants
steam power stations
nuclear power plants
ANSWER : Which of the following equipment provides fluctuating load ?
26.Which of the following place is not associated with nuclear power plants in India ?
Narora
Tarapur
Kota
Benglore
ANSWER : : Benglore
27.power plant is expected to have the longest life.
Steam
Diesel
Hydroelectric
Any of the above
ANSWER : : Hydroelectric
28.A nuclear power plant is invariably used as a
peak load plant
base load plant
stand-by plant
spinning reserve plant
ANSWER : : base load plant
29.which of the following plants ?
Base load plants
Peak load plants
Both (a) and (b)
none of the above
ANSWER : : Peak load plants
30.During load shedding
system power factor is changed
some loads are switched off
system voltage is reduced
system frequency is reduced Efficiency is the secondary consideration in
ANSWER : : some loads are switched off
31.Direct conversion of heat into electrical energy is possible through
fuel cells
solar cells
MHD generators
none of the above
ANSWER : : MHD generators
32.Which of the following should be used for extinguishing electrical fires ?
Water
Carbon tetrachloride fire extinguisher
Foam type fire extinguisher
CO2 fire extinguisher
ANSWER : : Carbon tetrachloride fire extinguisher
33._______ will offer the least load.
Vacuum cleaner
Television
Hair dryer
Electric shaver
ANSWER : : Electric shaver
34.Ships are generally jpowered by
nuclear power plants
hydraulic turbines
diesel engines
steam accumulators
ANSWER : : diesel engines
35.Generating capacity connected to the bus bars and ready to take load when switched on is known as
firm power
cold reserve
hot reserve
spinning reserve
ANSWER : : spinning reserve
36.Air will not be the working substance in which of the following ?
Closed cycle gas turbine
Open cycle gas turbine
Diesel engine
Petrol engine
ANSWER : : Closed cycle gas turbine
37.Direct conversion of heat into electric power is possible through
fuel cell
batteries
thermionic converter
all of the above
ANSWER : : thermionic converter
38.Which of the following, in a thermal power plant, is not a fixed cost ?
Fuel cost
Interest on capital
Depreciation
Insurance charges
ANSWER : : Fuel cost
39.power plant cannot have single unit of 100 MW.
Hydroelectric
Nuclear
Steam
Diesel
ANSWER : : Diesel
40.offers the highest electric load.
Television set
Toaster
Vacuum cleaner
Washing machine
ANSWER : : Toaster
41.The increased load during summer months is due to
increased business activity
increased water supply
increased use of fans and air conditioners
none of the above
ANSWER : : increased use of fans and air conditioners
42.With reference to a power station which of the following is not a fixed cost ?
Fuel cost
Interest on capital
Insurance charges
Depreciation
ANSWER : : Fuel cost
43.A low utilization factor for a plant indicates that
plant is used for stand by purpose only
plant is under maintenance
plant is used for base load only
plant is used for peak load as well as base load
ANSWER : : plant is used for stand by purpose only
44._______ industry has the least power consumption per tonne of product.
Soap
Sugar
Vegetable oil
Caustic soda
ANSWER : : Vegetable oil
45.Which of the following is not a source of power ?
Thermocouple
Photovoltaic cell
Solar cell
Photoelectric cell
ANSWER : : Thermocouple
46.The connected load of a IVMIM uir consumer is around
5 kW
40 k\V
80 kW
120 kW
ANSWER : : 5 kW
47.In an interconnected system, the diversity factor of the whole system
remains unchanged
decreases
increases
none of the above
ANSWER : : increases
48.Which of the following is not necessarily an advantage of interconnecting various power stations ?
Improved frequency of power supplied
Reduction in total installed capacity
Increased reliability
Economy in operation of plants
ANSWER : : Improved frequency of power supplied
49.________ is invariably used for peak load
Nuclear power plant
Steam turbine plant
Pumped storage plant
None of the above
ANSWER : : Pumped storage plant
50.Which of the following power plants need the least period for installation ?
Thermal power plant
Diesel power plant
Nuclear power plant
Hydro-electric power plant
ANSWER : : Diesel power plant
51.For a consumer the most economical power factor is generally
0.5 lagging
0.5 leading
0.95 lagging
0.95 leading
ANSWER : : 0.95 lagging
52.For a power plant which of the following constitutes running cost ?
Cost of wages
Cost of fuel
Cost of lubricants
All of the above
ANSWER : : All of the above
53.Generators for peak load plants are usually designed for maximum efficiency at
25 to 50 percent full load
50 to 75 percent full load
full load
25 percent overload
ANSWER : : 50 to 75 percent full load
54.Which of the following is the disadvantage due to low power factor ?
Poor voltage regulation
Increased transmission losses
High cost of equipment for a given load
All of the above
ANSWER : : All of the above
55.In a power plant if the maximum demand on the plant is equal to the plant capacity, then
plant reserve capacity will be zero
diversity factor will be unity
load factor will be unity
load factor will be nearly 60%
ANSWER : : plant reserve capacity will be zero
56.Which of the following is the essential requirement of peak load plant ?
It should run at high speed
It should produce high voltage
It should be small in size
It should be capable of starting quickly
ANSWER : : It should be capable of starting quickly
57.A synchronous condenser is virtually which of the following ?
Induction motor
Under excited synchronous motor
Over excited synchronous motor
D.C. generator
ANSWER : : Over excited synchronous motor
58.A power transformer is usually rated in
kW
kVAR
kWh
kVA
ANSWER : : kVA
59.Satic capacitors are rated in terms of
kW
kWh
kVAR
none of the above
ANSWER : : kVAR
60.By the use of which of the following power factor can be improved ?
Phase advancers
Synchronous compensators
Static capacitors
Any of the above
ANSWER : : Any of the above
61.An induction motor has relatively high power factor at
rated r.p.m.
no load
20 percent load
near full load
ANSWER : : near full load
62.public sector undertaking is associated with erection and sometimes running of thermal power plants
NTPC
SAIL
BEL
BHEL
ANSWER : : NTPC
63.In which of the following power plants the maintenance cost is usually high ?
Nuclear power plant
Hydro-electric power plants
Thermal power plants
Diesel engine power plants
ANSWER : : Thermal power plants
64.Incase of ______ fuel transportation is the major problem.
diesel power plants
nuclear power plants
hydro-electric power plants
thermal power plants
ANSWER : : thermal power plants
65.For which of the following power plants highly skilled engineers are required for running the plants ?
Nuclear power plants
Gas turbine power plants
Solar power plants
Hydro-electric power plants
ANSWER : : Nuclear power plants
66.________ will be least affected due to charge in supply voltage frequency.
Electric clock
Mixer grinder
Ceiling fan
Room heater
ANSWER : : Room heater
67.Which of the following is the disadvantage of a synchronous condenser ?
High maintenance cost
Continuous losses in motor
Noise
All of the above
ANSWER : : All of the above
68.In a distribution system, in order to improve power factor, the synchronous capacitors are installed
at the receiving end
at the sending end
either (a) or (b)
none of the above
ANSWER : : at the receiving end
69.Large capacity generators are invariably
water cooled
natural air cooled
forced air cooled
hydrogen cooled
ANSWER : : hydrogen cooled
70.In India production and distribution of electrical energy is confined to
private sector
public sector
government sectors
joint sector
ANSWER : : public sector
71.Which lightening stroke is most dangerous ?
Direct stroke on line conductor
Indirect stroke on conductor
Direct stroke on tower top
Direct stroke on ground wire
ANSWER : : Direct stroke on line conductor
72.The efficiency of a plant is of least concern when it is selected as
peak load plant
casual run plant
either (a) or (b)
base load plant
ANSWER : : either (a) or (b)
73.The effect of electric shock on human body depends on which of the following
current
voltage
duration of contact
all of the above
ANSWER : : all of the above
74.In a load curve the highest point represents
peak demand
average demand
diversified demand
none of the above
ANSWER : : peak demand
75.A pilot exciter is provided on generators for which of the following reasons ?
To excite the poles of main exciter
To provide requisite starting torque to main exciter
To provide requisite starting torque to generator
None of the above
ANSWER : : To excite the poles of main exciter
76.Which of the following are not repayable after a stipulated period ?
Shares
Fixed deposits
Cash certificates
Bonds
ANSWER : : Shares
77.An over excited synchronous motor on noload is known as
synchronous condenser
generator
induction motor
alternator
ANSWER : : synchronous condenser
78.In power plants insurance cover is provided for which of the following ?
Unskilled workers only
Skilled workers only
Equipment only
All of the above
ANSWER : : All of the above
79.Submarines for under water movement, are powered by which of the following ?
Steam accumulators
Air motors
Diesel engines
Batteries
ANSWER : : Batteries
80.Which of the following devices may be used to provide protection against lightening over voltages ?
Horn gaps
Rod gaps
Surge absorbers
All of the above
ANSWER : : All of the above
81.When the demand of consumers is not met by a power plant, it will resort to which of the following ?
Load shedding
Power factor improvement at the , generators
Penalising high load consumers by increasing the charges for electricity
Efficient plant operation
ANSWER : : Load shedding
82.The expected useful life of an hydroelectric power station is around
15 years
30 years
60 years
100 years
ANSWER : : 100 years
83.An alternator coupled to a _____ runs at slow speed, as compared to as compared to others.
diesel engine
hydraulic turbine
steam turbine
gas turbine
ANSWER : : hydraulic turbine
84.For the same cylinder dimensions and speed, which of the following engine will produce least power ?
Supercharged engine
Diesel engine
Petrol engine
All of the above engines will equal power
ANSWER : : Petrol engine
85.The primary reason for low power factor is supply system is due to installation of
induction motors
synchronous motors
single phase motors
d.c. motors
ANSWER : : induction motors
86.Which of the following plants is almost inevitably used as base load plant ?
Diesel engine plant
Gas turbine plant
Nuclear power plant
Pumped storage plant
ANSWER : : Nuclear power plant
86.Which of the following is an advantage of static capacitor for power factor improvement ?
Little maintenance cost
Ease in installation
Low losses
All of the above
ANSWER : : All of the above
87.Which of the following component, in a steam power plant, needs maximum maintenance attention ?
Steam turbine
Condenser
Water treatment plant
Boiler
ANSWER : : Boiler
88.Load shedding is possible through which of the following ?
Switching of the loads
Frequency reduction
Voltage reduction
Any of the above
ANSWER : : Any of the above
89.For any type of consumer the ideal tariff is
two part tariff
three part tariff
block rate tariff
any of the above
ANSWER : : three part tariff
90.The least share of power is provided in India, by which of the following power plants ?
Diesel power plants
Thermal power plants
Hydro-electric power plants
Nuclear power plants
ANSWER : : Diesel power plants
91.Which of the following is not a method for estimating depreciation charges ?
Sinking fund method
Straight line method
Diminishing value method
Halsey’s 50�50 formula
ANSWER : : Halsey’s 50�50 formula