46. What is the maximum value of a load which consume 500 kWh per day at a load factor of 0.40, if the consumer increases the load factor of 0.50 without increasing the maximum demand?

1. 1. 52.08 kW

   
   
   

   2. 50.8 kW

   
   
   

   3. 4.5 kW

   
   
   

   4. 60 kW

   
   
   

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1. View Hint View Answer Discuss in Forum

   Load factor =	Energy consumed in 24 hours
   	Maximum demand in kW × 24

   
   

   or 0.40 =	500
   	Maximum demand × 24

   
   

   Maximum demand =	500	= 52.08kW
   	0.40 × 24

   Correct Option: A

   Load factor =	Energy consumed in 24 hours
   	Maximum demand in kW × 24

   
   

   or 0.40 =	500
   	Maximum demand × 24

   
   

   Maximum demand =	500	= 52.08kW
   	0.40 × 24

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47. The yearly load duration curve of a power plant is a straight line. The maximum load is 750 MW and the minimum load is 600 MW. The capacity of the plant is 900 MW. What is the capacity factor and utilization factor?

1. 1. 0.56, 0.80

   
   
   

   2. 0.75, 0.83

   
   
   

   3. 0.78, 0.9

   
   
   

   4. 0.80, 0.83

   
   
   

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1. View Hint View Answer Discuss in Forum

   Average Annual load =	750 + 600	= 675 MW
   	2

   
   

   Capacity factor =	Average Annual load	=	675	= 0.75
   	Capacity of the Plant		900

   
   

   Utilization factor =	Maximum demand	=	750	= 0.83
   	Capacity of the plant		900

   Correct Option: B

   Average Annual load =	750 + 600	= 675 MW
   	2

   
   

   Capacity factor =	Average Annual load	=	675	= 0.75
   	Capacity of the Plant		900

   
   

   Utilization factor =	Maximum demand	=	750	= 0.83
   	Capacity of the plant		900

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48. What is the utilization factor of a power station which supplies the following loads ?
    Load A: Motor load of 200 kW between 10 AM to 7 PM
    Load B: Lighting load of 100 k W bet ween 7 PM to 11 PM
    Load C: Pumping load of 110 kW between 3 PM to 10 AM

1. 1. 1.60

   
   
   

   2. 1.32

   
   
   

   3. 1.00

   
   
   

   4. 2.56

   
   
   

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1. View Hint View Answer Discuss in Forum

   Sum of individual maximum demands
   = (200 + 100 + 110) kW = 410 kW.
   

   Time	Load
   10 AM to 3 PM	200 kW
   3 PM to 7 PM	(200 + 110) kW = 310 kW
   7 PM to 11 PM	(100 + 110) kW = 210 kW
   11 PM to 10 AM	110 kW

   
   Maximum demand of the whole system is 310 kW. Utiligation factor
   

   =	Sum of individual maximum demand	=	410	= 1.32
   	Maximum demand of whole system		132

   Correct Option: B

   Sum of individual maximum demands
   = (200 + 100 + 110) kW = 410 kW.
   

   Time	Load
   10 AM to 3 PM	200 kW
   3 PM to 7 PM	(200 + 110) kW = 310 kW
   7 PM to 11 PM	(100 + 110) kW = 210 kW
   11 PM to 10 AM	110 kW

   
   Maximum demand of the whole system is 310 kW. Utiligation factor
   

   =	Sum of individual maximum demand	=	410	= 1.32
   	Maximum demand of whole system		132

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49. A power station supplies the peak load of 50 MW, 40 MW and 70 MW to three localities. The annual load factor is 0.50 p.u. and the diversity factor of the load at the station is 1.55. The maximum demand on the station and average load respectively will be

1. 1. 120 MW, 60.8

   
   
   

   2. 90 MW, 50.6

   
   
   

   3. 103.2 MW, 51.61

   
   
   

   4. 100 MW, 0.51

   
   
   

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1. View Hint View Answer Discuss in Forum

   Diversity factor =	Sum of individual maximum demand
   	Maximum demand on the station

   
   

   or 1.55 =	(50 + 40 + 70) MW
   	maximum demand on the station

   
   

   ∴ Maximum demand on the station =	160 MW	= 103.22 MW
   	1.55

   
   Average load = load factor × maximum demand
   = (0.50 × 103.22) MW = 51.61 MW

   Correct Option: C

   Diversity factor =	Sum of individual maximum demand
   	Maximum demand on the station

   
   

   or 1.55 =	(50 + 40 + 70) MW
   	maximum demand on the station

   
   

   ∴ Maximum demand on the station =	160 MW	= 103.22 MW
   	1.55

   
   Average load = load factor × maximum demand
   = (0.50 × 103.22) MW = 51.61 MW

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50. In a DC transmission line

1. 1. it is necessary for the sending end and receiving end to be operated in synchronism

   
   
   

   2. the effects of inductive and capacitive reactances are greater than in an AC transmission line of the same rating.

   
   
   

   3. there are no effects due to inductive and capacitive reactances.

   
   
   

   4. power transfer capability is limited by stability considerations.

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

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