A. Main line service
B. Urban service
C. Sub-urban service
D. Urban and sub-urban service
Related Mcqs:
- Speed-time curve of main line service differs from those of urban and suburban services on following account_______________?
A. it has longer free running period
B. it has longer coasting period
C. accelerating and braking periods are comparatively smaller
D. all of the above - An aeroplane of wingspan 10m flies from the equator towards the North Pole. The wings are perpendicular to the vertical component of the earths magnetic field (B = 4×10-5T). At maximum speed an emf of 96mV is induced across the wing tips. The maximum speed of the aeroplane is____________?
A. 150msec-1
B. 384msec-1
C. 38.4msec-1
D. 200msec-1 - When a bogie negotiates a curve, reduction in adhesion occurs resulting in sliding. Thus sliding is acute when_______________?
A. wheel base of axles is more
B. degree of curvature is more
C. both A. and B.
D. none of the above - For three-phase induction motors which of the following is the least efficient method of speed control ?
A. Cascade control
B. Pole changing
C. Rheostat control
D. Combination of cascade and pole changing - Which of the following methods is used to control speed of 25 kV, 50 Hz single phase traction ?
A. Reduced current method
B. Tap changing control of transformer
C. Series parallel operation of motors
D. All of the above - If the gain versus frequency curve of a transistor amplifier is not flat, then there is distortion ?
A. Amplitude
B. Intermodulation
C. Frequency
D. None of the above - In obtaining the frequency response curve of an amplifier, the______________?
A. Amplifier level output is kept constant
B. Amplifier frequency is held constant
C. Generator frequency is held constant
D. Generator output level is held constant - Besides a constant speed a synchronous rotor possesses which of the following advantages ?
A. Lower cost
B. Better efficiency
C. High power factor
D. All of the above - Which of the following motors is preferred when quick speed reversal is the main consideration ?
A. Squirrel cage induction motor
B. Wound rotor induction motor
E. Synchronous motor
D. D.C. motor - Which of the following motors is preferred when smooth and precise speed control over a wide range is desired ?
A. D.C. motor
B. Squirrel cage induction motor
C. Wound rotor induction motor
D. Synchronous motor
