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

AP ECET Electrical and Electronics Engineering - Unit VII: Electric Traction

Multiple Choice Questions (91 to 105) - AP ECET Electrical and Electronics Engineering (EEE) - Unit VII: Electric Traction

91. What is the primary purpose of electric traction in railways?

a) To reduce power losses
b) To increase the speed of trains
c) To provide a constant speed
d) To improve the efficiency of the train

Answer: b) To increase the speed of trains

92. Which of the following is NOT a system of train electrification?

a) DC system
b) AC system
c) Single-phase system
d) Multi-phase system

Answer: d) Multi-phase system

93. The speed-time curve for different services is used to determine:

a) Maximum speed
b) Tractive effort
c) Schedule speed
d) Specific energy consumption

Answer: c) Schedule speed

94. Tractive effort is the force exerted by:

a) The train on the track
b) The train's locomotive on the vehicle
c) The locomotive motor on the wheels
d) The traction motor on the track

Answer: c) The locomotive motor on the wheels

95. Specific energy consumption in electric traction is:

a) The total energy consumed per unit distance
b) The total energy consumed per unit weight of the train
c) The energy consumed per unit time
d) The energy consumed per unit area

Answer: b) The total energy consumed per unit weight of the train

96. Which of the following is a common type of traction motor used in electric traction?

a) Synchronous motor
b) Induction motor
c) DC motor
d) Stepper motor

Answer: c) DC motor

97. In electric traction, what is the purpose of traction system auxiliaries?

a) To provide cooling to the train
b) To reduce the tractive effort
c) To assist in speed control
d) To support additional electrical functions

Answer: d) To support additional electrical functions

98. In an electric traction system, what does the schedule speed refer to?

a) The average speed of the train during the entire journey
b) The maximum speed of the train
c) The speed of the train at the start of the journey
d) The speed of the train during acceleration

Answer: a) The average speed of the train during the entire journey

99. The speed-time curve for a train is useful to:

a) Determine the maximum load capacity
b) Estimate the tractive effort required
c) Measure the distance covered
d) Calculate the energy consumed

Answer: b) Estimate the tractive effort required

100. The term "tractive effort" refers to:

a) The weight of the train
b) The force required to overcome the resistance of the train
c) The energy consumed by the train
d) The braking force exerted by the train

Answer: b) The force required to overcome the resistance of the train

101. What is the unit of specific energy consumption in electric traction?

a) kWh/km
b) Wh/km
c) J/km
d) kWh/ton-km

Answer: d) kWh/ton-km

102. Which factor does NOT affect the tractive effort required for a train?

a) The weight of the train
b) The gradient of the track
c) The efficiency of the traction motor
d) The temperature of the air

Answer: d) The temperature of the air

103. Which type of electric traction system is most commonly used in urban areas for trains?

a) AC system
b) DC system
c) Hybrid system
d) Diesel-electric system

Answer: b) DC system

104. In electric traction, what is the primary advantage of using AC motors over DC motors?

a) Higher efficiency at low speeds
b) Greater control over speed
c) Ease of speed regulation
d) Ability to handle higher power levels

Answer: d) Ability to handle higher power levels

105. Which of the following is an auxiliary system used in electric traction to improve efficiency?

a) Electric brakes
b) Regenerative braking
c) Air-conditioning
d) Safety system

Answer: b) Regenerative braking

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