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MCQs

Total Questions : 252 | Page 1 of 26 pages
Question 1.  The most vital factor against electric traction is the
  1.    necessity of providing a negative booster
  2.    possibility of electric supply failure
  3.    high cost of its maintenance
  4.    high initial cost of laying out over-head electric supply system.
 Discuss Question
Answer: Option D. -> high initial cost of laying out over-head electric supply system.
Question 2.  Tractive effort of an electric locomotive can be increased by
  1.    increasing the supply voltage
  2.    using high kW motors increasing dead weight over the driving axles
  3.    both and
  4.    both and
 Discuss Question
Answer: Option D. -> both and
Question 3.  The main reason for choosing the composite 1-phase ac to dc system for all future track electrification in India is that it
  1.    needs less number of sub-stations
  2.    combines the advantages of high voltage ac distribution at 50 Hz with dc series traction motors
  3.    provides flexibility in the location of sub-stations
  4.    requires light overhead catenary
 Discuss Question
Answer: Option B. -> combines the advantages of high voltage ac distribution at 50 Hz with dc series traction motors
Question 4.  For the single-phase ac system of track electrification, low frequency is desirable because of the following advantage/s
  1.    it improves commutation properties of ac motors
  2.    it increases ac motor efficiency
  3.    it increases ac motor power factor
  4.    all of the above
 Discuss Question
Answer: Option D. -> all of the above
Question 5.  Welding is not done directly from the supply mains because
  1.    it is customary to use welding machines
  2.    its voltage is too high
  3.    its voltage keeps fluctusting
  4.    it is impracticable to draw heavy currents
 Discuss Question
Answer: Option D. -> it is impracticable to draw heavy currents
Question 6.  The free-running speed of a train does NOT depend on the
  1.    duration of stops
  2.    distance between stops
  3.    running time
  4.    acceleration
 Discuss Question
Answer: Option A. -> duration of stops
Question 7.  In electric welding, arc blow can be avoided by
  1.    using bare electrodes
  2.    welding away from earth ground connection
  3.    using ac welding machines
  4.    increasing arc length
 Discuss Question
Answer: Option C. -> using ac welding machines
Question 8.  Submerged arc process is characterised by
  1.    deep penetration
  2.    high welding current
  3.    exceptionally smooth beads
  4.    all of the above
 Discuss Question
Answer: Option D. -> all of the above
Question 9.  Unlike TIC welding, MIG welding
  1.    requires no flux
  2.    uses consumable electrodes
  3.    provides complet protection from atmospheric contamination
  4.    requires no post-weld cleansing
 Discuss Question
Answer: Option B. -> uses consumable electrodes
Question 10. . MIG welding process is becoming increasingly popular in welding industry mainly because of
  1.    its easy operation
  2.    its high metal deposit rate
  3.    its use in both ferrous and non-ferrous metals
  4.    both and
 Discuss Question
Answer: Option D. -> both and

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