127. When the speed of the train is estimated taking into account the time of stop at a station in addition to the actual running time between stops, is known as
A. Average speed
B. Schedule speed
C. Notching speed
D. Free running speed
128. A train runs at an average speed of 50 kmph between stations situated 2.5 km apart. The train accelerates at 2 kmphs and retards at 3 kmphs. Speed-time curve may be assumed to be trapezoidal. The maximum speed is
A. 27.75 kmph
B. 38.50 kmph
C. 44.25 kmph
D. 57.75 kmph
129. If the resistance to electric train is given by : Fr = a + by + cv2. In this equation, constant c is likely to cover
A. air resistance
B. frictional resistance
C. flange resistance
D. track resistance
130. An ideal traction system should have
A. high starting tractive effort.
B. the locomotive is to run on metre gauge track
C. the locomotive is for shunting duty
D. the locomotives is for goods trains only.
131. Two shunt motors having identical characteristics are used to drive a car with unequal wheel diameters. The two motors share load equally if they are connected in
C. the loading will always be unequal.
D. none of these
132. Two locomotives having identical tractive-effort-slip characteristic haul a heavy train. The loco with larger diameter shares
A. larger tractive effort
B. smaller tractive effort
C. equal tractive effort
D. none of these
133. In case of bow and pantograph current collectors.
A. the bow collector is used for large current at higher speeds.
B. the pantograph collector is used for large currents at higher speeds.
C. the bow collector is used for large currents at lower speeds.
D. the pantograph collector is used for large currents at lower speeds.
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