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In two part tariff, variation in load factor will affect operating or running charges.

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Answer : In Hopknison demand rate or two part tariff the demand rate or fixed charges are dependent upon the maximum demand of the consumer.

Description : If we change the excitation of synchronous machine will it affect on power factor?

Answer : Yes, If we change the excitation of synchronous machine it will affect on power factor. If the synchronous motor is overexcited then it will have leading power factor and if the motor is underexcited then it will have lagging power factor.

Description : Define the terms: i) Tariff ii) Fuel surcharge iii) Electricity Duty iv) Connected load

Answer : i) Tariff: The rate at which a consumer is charged for the consumption of electricity is called as tariff. OR The amount of money framed by the supplier for the supply of electrical energy ... is the total wattage of all appliances which are used by the consumer on his sanctioned connection. 

Description : Define the following terms related to tariff: (i) Connected load (ii) Unit consumed (iii) Fixed charges (iv) Electricity Tax 

Answer : (i) Connected load  It is the sum of the power ratings (Watts or kW or MW) of all devices and machines existing (installed) in the premises of consumer. It is used to decide the ... a percentage of the total electricity bill which includes all amounts that go to the electricity supply agency. 

Description : Discuss how power factor tariff results into energy conservation.

Answer : Power factor tariff results into energy conservation: i) Applying incentives and penalties according to power factor is an effective way, which enables consumer to improve power factor so that he can ... finally leads to reduction in the current drawn by the load and helps for energy conservation.

Description : State the incentives and penalties related with power factor tariff.

Answer : Incentives and penalties related with power factor tariff: In addition to basic tariff (Maximum Demand Tariff / KVA Maximum Demand Tariff / Load factor tariff) the tariff in which P.F. of ... industrial consumer/H.T/ commercial consumers with contract demand above 80 kw/ 100Kva/107 hp consumer.

Description : In order to have a lower cost of electrical energy generation the load factor  (1) and the diversity factor should be low (2) should be low but the diversity factor should be high (3) should be high but the diversity factor should be low (4) and the diversity factor both should be high

Answer : In order to have a lower cost of electrical energy generation the load factor and the diversity factor both should be high

Answer : Peak load plant can never have 100 percent load factor.

Answer : High load factor indicates total plant capacity is utilised for most of the time.

Answer : The load factor of domestic load is usually 10 to 15%.

Answer : Load factor of a power station is generally less than unity.

Answer : Load factor of a power station is defined as average load/maximum demand.

Description : The load duration curve for unity load factor will be of  (1) Rectangular shape (2) Triangular shape (3) L -shape (4) I -shape

Answer : The load duration curve for unity load factor will be of Rectangular shape

Description : If the load of the normally excited synchronous motor is increased the power factor will?

Answer : If the load of the normally excited synchronous motor is increased the power factor will become lagging.

Answer : The two pressure coils of a single phase power factor meter have the same dimensions and the same number of turns.

Description : In a synchronous generator delivering lagging power factor load  (1) the excitation emf leads terminal voltage by the power angle (2) the excitation emf lags terminal voltage by the power angle (3) ... by the power factor angle (4) excitation emf lags the terminal voltage by the power factor angle

Answer : In a synchronous generator delivering lagging power factor load the excitation emf leads terminal voltage by the power angle

Description : Load factor is the  (1) Ratio of maximum load on the station to sum of consumer's maximum load.  (2) Ratio of average demand to maximum demand.  (3) Factor used for increasing load.  (4) Reciprocal of (1).

Answer : Load factor is the Ratio of average demand to maximum demand. 

Description : A transformer has negative voltage regulation when its load power factor is   (1) Zero (2) Unity (3) Leading (4) Lagging

Answer : Leading

Description : Power station having Load factor = 70%, capacity factor = 50%, used factor = 60%, maximum demand = 20MW then annual energy production is  (1) 122.8 GWh (2) 198.55 GWh (3) 128.2 GWh (4) 188.82 GWh

Answer : Power station having Load factor = 70%, capacity factor = 50%, used factor = 60%, maximum demand = 20MW then annual energy production is 122.8 GWh

Answer : The power factor of a single phase load can be calculated if the instruments available are three ammeters or three voltmeters.

Description : Minimum voltage regulation occurs when the power factor of the load is?

Answer : Minimum voltage regulation occurs when the power factor of the load is leading.

Description : The synchronous motor which works on leading power factor and does not drive any mechanical load is called?

Answer : The synchronous motor which works on leading power factor and does not drive any mechanical load is called synchronous condenser.

Answer : For any type of consumer the ideal tariff is three part tariff.

Description : If we change the excitation of synchronous machine will it affect on motor speed?

Answer : No, If we change the excitation of synchronous machine it will not affect on motor speed.

Description : What is Time of Day tariff? How it help in energy conservation?

Answer : Time-off-day tariff:- In addition to basic tariff (Maximum Demand Tariff / KVA Maximum Demand Tariff / Load factor tariff /also the tariff in which P.F. of industrial consumer is taken ... the rated load for longer times of the day their overall efficiency gets higher helping to conserve energy.

Description : The main objectives in framing tariff are:  (A) The consumers must readily understand the tariffs (B) The tariff must be equitable amongst different consumers (C) Tariffs can be modified from time to time (D) All of the above

Answer : The main objectives in framing tariff are:  (A) The consumers must readily understand the tariffs (B) The tariff must be equitable amongst different consumers (C) Tariffs can be modified from time to time (D) All of the above

Description : List the different types of tariff.

Answer : Various types of Tariff:-  1) Flat-demand Tariff  2) Simple-demand Tariff or Uniform Tariff  3) Flat-rate Tariff  4) Step-rate Tariff  5) Block-rate Tariff  6) Two-part Tariff  7) Maximum demand Tariff ... c) KW and KVAR Tariff 10) TOD (Time of Day) Tariff 11) TOU ( Time of Usage) Tariff

Description : State the objectives of tariff systems.

Answer : Objectives of tariff system: 1) Recover judiciously and legally capital investment made on electricity generation, transmission & distribution. 2) Recover judiciously and legally the cost of operation, supplies ... for high power factor. 8) Gain a suitable profit on the capital investment.

Answer : For high value of diversity factor, a power station of given installed capacity will be in a position to supply more number of consumers.

Answer : Power plant having maximum demand more than the installed rated capacity will have utilisation factor more than unity.

Description : What is Part Programming? Enlist Basic Requirement for part programming with suitable example.

Answer : Definition: The part program is a sequence of instructions, which describe the work, which has to be done on a part, in the form required by a computer under the control of a numerical ... Defining the work part geometry. (b) Defining the repetition work. (c) Specifying the operation sequence

Description : Which of the following is not a part of transformer installation?  (A) Conservator (B) Breather (C) Buchholz Relay (D) Exciter

Answer : Which of the following is not a part of transformer installation?  (A) Conservator (B) Breather (C) Buchholz Relay (D) Exciter

Description : Part of the transformer which is most subject to damage from overheating is?

Answer : Part of the transformer which is most subject to damage from overheating is winding insulation.

Description : The following formula is correct:  (A) Load factor=Average load for a period/ Peak load for the same period  (B) Load factor=Average load for a period x Peak load for the same period  (C) Load factor=Average load for a period + Peak load for the same period  (D) All of the above

Answer : The following formula is correct: (A) Load factor=Average load for a period/ Peak load for the same period (B) Load factor=Average load for a period x Peak load for the same period (C) Load factor=Average load for a period + Peak load for the same period (D) All of the above

Answer : In a load curve the highest point represents peak demand.

Answer : Load curve is useful in deciding the operating schedule of generating units, sizes of generating units, total installed capacity of the plant.

Answer : In a distribution system, in order to improve power factor, the synchronous capacitors are installed at the receiving end.

Answer : In an interconnected system, the diversity factor of the whole system increases.

Description : Compare base load plant with peak load plant. 

Answer : Sr.No. Points Base load plant Peak load plant  1 Definition The power plant which supplies base load of load curve is known as base load plant The power ... power station   Small capacity storage hydro, pumped storage hydro, gas, diesel power station. 

Answer : 1. Connected Load: It is the sum of load of all equipment's connected to supply system which are in use or not in use of each consumer. OR   The sum of connected load of all consumers ... is the maximum load which a consumer uses at a particular time period out of his total connected load. 

Answer : Nuclear power plant is invariably used as base load plant.

Answer : Generators for peak load plants are usually designed for maximum efficiency at 50 to 75 percent full load.

Answer : Generating capacity connected to the bus bars and ready to take load when switched on is known as spinning reserve.

Answer : The increased load during summer months is due to increased use of fans and air conditioners.

Answer : The area under a load curve gives energy consumed.

Answer : A load curve indicates average kWh (kW) energy consumption during the period.

Answer : An induction motor has relatively high power factor at near full load.

Answer : For a consumer the most economical power factor is generally 0.95 lagging .

Answer : The primary reason for low power factor is supply system is due to installation of induction motors.

Answer : A low utilization factor for a plant indicates that plant is used for stand by purpose.

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