AP ECET ELECTRICAL AND ELECTRONICS ENGINEERING (EEE) Multiple Choice Questions (MCQs)

76. Which of the following is NOT a type of supply system used for transmission and distribution?

• a) Single-phase system
• b) Three-phase system
• c) Four-phase system
• d) Poly-phase system

Answer: c) Four-phase system

77. The inductance and capacitance of a transmission line depend on:

• a) The frequency of the supply
• b) The length of the transmission line
• c) The load connected at the receiver end
• d) Both the length and the frequency of the transmission line

Answer: d) Both the length and the frequency of the transmission line

78. Which of the following is a characteristic of short transmission lines?

• a) High inductance
• b) Negligible capacitance
• c) High voltage drop
• d) Large power loss

Answer: b) Negligible capacitance

79. The Ferranti effect in transmission lines refers to:

• a) Voltage rise at the receiving end of a long transmission line
• b) Voltage drop at the receiving end of a short transmission line
• c) Power loss due to resistance
• d) Reduction of efficiency due to corona effect

Answer: a) Voltage rise at the receiving end of a long transmission line

80. Which of the following phenomena occurs due to the presence of high voltage in transmission lines?

• a) Corona
• b) Ferranti effect
• c) Skin effect
• d) Eddy current losses

Answer: a) Corona

81. Which of the following is a basic advantage of HVDC transmission?

• a) Increased power loss
• b) Better voltage regulation
• c) Lower cost for long-distance transmission
• d) More complexity in operation

Answer: c) Lower cost for long-distance transmission

82. The disadvantage of HVDC transmission is:

• a) It requires complex equipment for conversion
• b) It is not suitable for long-distance transmission
• c) It results in higher losses than AC transmission
• d) It is prone to corona loss

Answer: a) It requires complex equipment for conversion

83. What is the purpose of supports in a transmission line?

• a) To support the conductor
• b) To maintain proper voltage
• c) To regulate the current flow
• d) To reduce the sag of the conductor

Answer: a) To support the conductor

84. The voltage distribution across the string of insulators depends on:

• a) The height of the transmission tower
• b) The number of insulators in the string
• c) The type of conductor used
• d) The temperature of the conductor

Answer: b) The number of insulators in the string

85. String efficiency is a measure of:

• a) The power loss in the transmission line
• b) The voltage regulation of the line
• c) The efficiency of the insulators in a string
• d) The ratio of the total voltage across all insulators to the voltage across each insulator

Answer: c) The efficiency of the insulators in a string

86. Which of the following is the method to improve string efficiency in transmission lines?

• a) Using a higher number of insulators
• b) Using grading capacitors
• c) Using lower voltage insulators
• d) Using fewer transmission towers

Answer: b) Using grading capacitors

87. Earthing of a transmission line is necessary for:

• a) Preventing lightning strikes
• b) Providing a return path for current
• c) Improving line efficiency
• d) Reducing the weight of the conductor

Answer: b) Providing a return path for current

88. The layout of substations mainly depends on:

• a) Power station location
• b) Type of cables used
• c) Type of distribution system
• d) Electrical load requirements

Answer: d) Electrical load requirements

89. Which of the following is NOT a type of electrical cable classification?

• a) Low voltage cables
• b) Medium voltage cables
• c) High voltage cables
• d) Ultra-high voltage cables

Answer: d) Ultra-high voltage cables

90. In a radial distribution system, the variation of load voltage is:

• a) Constant across the system
• b) Gradually increases with distance
• c) Gradually decreases with distance
• d) Zero voltage variation

Answer: c) Gradually decreases with distance