Technical Questions asked in Schneider

  1. In a transformer, zero voltage regulation at full load is:
    1. Not possible
    2. Possible at unity power factor load
    3. Possible at leading power factor load
    4. Possible at lagging power factor load
    Answer: Option C.
    The zero voltage regulation at full load is possible at leading power factor load.
  2. The DC motor, which can provide zero speed regulation at full load without any controller is :
    1. Series
    2. Shunt
    3. Cumulative compound
    4. Differential compound
    Answer:  Option B.
    The speed and armature current characteristics of DC motor show that the speed of shunt motor is almost constant load. Therefore, shunt motor can provide zero speed regulation
  1. The concept of an electrically short, medium , and long line is primarily based on the
    1. Nominal voltage of the line
    2. Physical length of the line
    3. Wavelength of the line
    4. Power transmitted over the line
    Answer: Option B.
    The concept of electrically short, medium and long line is primarily based on the physical length of the line.
  2. Keeping in view the cost and overall effectiveness, which of the following circuit breakers is best suited for capacitor bank switching?
    1. Vacuum
    2. Air blast
    3. SF6
    4. Oil
    Answer: Option A.
    Because of short gal and excellent recovery characteristics of vacuum breakers they can be used where the switching frequency is high and required to be reliable and maintenance required is also least. Hence, suitable for capacitor bank switching.
  3. Feedback control systems are
    1. Insensitive to both forward and feedback path parameter changes
    2. Less sensitive to feedback path parameter changes than to forward path parameter changes
    3. Less sensitive to forward path parameter changes than to feedback path parameter changes
    4. Equally sensitive to forward and feedback path parameter changes.
    Answer: Option C.
  4. The effect of stray magnetic fields on the actuating torque of a potable instrument is maximum when the operating field of the instrument and the stray fields are
    1. Perpendicular
    2. Parallel
    3. Inclined at 600
    4. Inclined at 300
    Answer: Option B.
    Actuating torque is directly proportional to cos (angle between operating field and magnetic field) For maximum actuating torque both are parallel.

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