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

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

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

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 : 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 : 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 : 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

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

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 : 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.

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 : Most common form of A.C. meters met with in every day domestic and industrial installations are induction type single phase energy meters.

Answer : The wattage of motor for driving domestic sewing machine will be around 100 to 150 W.

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

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

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

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

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

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

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

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.

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 : Diversity factor has direct effect on the?

Answer : Diversity factor has direct effect on the fixed cost of unit generated.

Answer : Demand factor is defined as maximum demand/connected load.

Description : Can a synchronous condenser improve power factor?

Answer : Yes, synchronous condenser can improve power factor.

Description : What is the maximum value of power factor?

Answer : 1 is the maximum value of power factor.

Description : Power factor of an inductive circuit is usually improved by connecting capacitor to it in?

Answer : Power factor of an inductive circuit is usually improved by connecting capacitor to it in parallel.

Answer : The power factor of a single-phase induction motor is usually lagging.

Answer : The standard full-load power factor ratings for synchronous motors are unity or 0.8 leading.

Description : Explain MCB and ELCB with connection diagram supplying single phase load. 

Answer : OR OR Explanation: * MCB provides short circuit protection. * MCB provides overload protection * ELCB provides earth fault protection. * MCB is in series with ... occurs, the ELCB cuts off the power within the time of 0.1 sec. automatically to protect the personnel. 

Description : Explain with neat circuit diagrams the procedures to perform no load and blocked rotor tests on three phase induction motor.

Description : Single-phase mid-point controlled rectifier with RL load

Answer : Single-phase mid-point controlled rectifier with RL load : The circuit configuration of single-phase midpoint controlled rectifier is shown in the figure. During positive half-cycle of ... some part of next positive half-cycle of voltage with reversed polarity can appear across load.

Description : Class A Load Commutation

Answer : Class A: Load Commutation: The class A or load commutation (also called self-commutation or resonant commutation) is employed in thyristor circuits supplied from DC source. The commutating components include ... biased. Thus the zero-current and reverse-bias cause the thyristor to turn-off. 

Description : Single-phase Midpoint controlled rectifier with Resistive load

Answer : Single-phase Midpoint controlled rectifier with Resistive load:  1) During positive half cycle of AC supply, a is positive with respect to b , this makes T1 forward biased and T2 is reverse ... voltage reverses the polarity and T2 is turned off. The operation is as shown in waveforms.

Description : Define for polyphase circuit (i) Balanced load (ii) Unbalanced load. Draw one example circuit for each type of load.

Answer : i) Balanced Load: Balanced three phase load is defined as star or delta connection of three equal impedances having equal real parts and equal imaginary parts.  Example circuit:  ii) ... satisfy the condition of balance, then it is called as unbalanced load.  Example circuit:

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