41. A medium line with parameters A, B, C, D is extended by connecting a short line of impedance Z in series. The over all ABCD par ameters of the series combination will be

1. 1. A, AZ, C + D/Z, D

   
   
   

   2. A, AZ + B, C, CZ + D

   
   
   

   3. A + BZ, B, C + DZ, D

   
   
   

   4. AZ, B, C/Z, D

   
   
   

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1. View Hint View Answer Discuss in Forum

   	A		B		=		A1		B1
   	C		D				C1		D1

   
   For a short line, A = 1, B = Z, C = 0, D = 1
   ∴ Resultant parameters are given by
   

   	AT		BT		=		A		B
   	CT		DT				C		D

   
   

   	1		Z		=		A		AZ + B
   	0		1				C		CZ + D

   Correct Option: B

   	A		B		=		A1		B1
   	C		D				C1		D1

   
   For a short line, A = 1, B = Z, C = 0, D = 1
   ∴ Resultant parameters are given by
   

   	AT		BT		=		A		B
   	CT		DT				C		D

   
   

   	1		Z		=		A		AZ + B
   	0		1				C		CZ + D

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42. A single phase transmisson line of impedance j 0.8 ohm supplies a resistive load of 500 A at 300 V. The sending end power factor is

1. 1. unity

   
   
   

   2. 0.8 lagging

   
   
   

   3. 0.8 leading

   
   
   

   4. 0.6 lagging

   
   
   

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1. View Hint View Answer Discuss in Forum

   V_S = V_r + IZ_s
   = 300 + j 0.8 × [500 × 0.8 – 500 × 0.6]
   = 300 + j 0.8 [400 – j 300]
   = 300 + j 320 + 240 = 540 + j 320
   

   =	320	= 0.6 lag
   	500

   Correct Option: D

   V_S = V_r + IZ_s
   = 300 + j 0.8 × [500 × 0.8 – 500 × 0.6]
   = 300 + j 0.8 [400 – j 300]
   = 300 + j 320 + 240 = 540 + j 320
   

   =	320	= 0.6 lag
   	500

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43. Which one of the following statements is not correct for the use of bundled conduct or sin transmission lines?

1. 1. Control of voltage gradient

   
   
   

   2. Reduction in corona loss

   
   
   

   3. Reduction in radio interference

   
   
   

   4. Increase in interference with communication lines

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

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44. For equilateral spacing of conductors of an untrasposed 3-phase line, we have

1. 1. bal anced receiving end voltage and no communication interference

   
   
   

   2. unbalanced receiving end volt age and no communication interference

   
   
   

   3. balanced receiving end voltage and communication interference

   
   
   

   4. unbal anced receiving end voltage and communication interference.

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

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45. 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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