Q.1
What is the range for the stator slot pitch for the large hydro-electric generators?
  • a) 50-60 mm
  • b) 50-70 mm
  • c) 50-80 mm
  • d) 50-90 mm
Q.2
When is the range of the number of slots per pole per phase in the salient pole machines?
  • a) 2-3
  • b) 3-4
  • c) 2-4
  • d) 2-6
Q.3
Fractional windings are invariably used in synchronous machines.
  • a) true
  • b) false
Q.4
What is the relation between coil span and harmonics?
  • a) low coil span decreases harmonics to less amount
  • b) low coil span decreases the harmonics drastically
  • c) high coil span decreases the harmonics drastically
  • d) high coil span decreases the harmonics by small amount
Q.5
The coil span should be 8.percent of pole pitch to obtain the maximum reduction of harmonics.
  • a) true
  • b) false
Q.6
When is the formula for the flux per pole?
  • a) flux per pole = average magnetic field * pole pitch * length of the core
  • b) flux per pole = average magnetic field / pole pitch * length of the core
  • c) flux per pole = average magnetic field * pole pitch / length of the core
  • d) flux per pole = 1 / average magnetic field * pole pitch * length of the core
Q.7
What is the formula for the turns per phase in the armature design?
  • a) turns per phase = voltage per phase * parallel paths per phase / 4.44 * flux density * frequency * winding space factor
  • b) turns per phase = voltage per phase / parallel paths per phase * 4.44 * flux density * frequency * winding space factor
  • c) turns per phase = voltage per phase * parallel paths per phase * 4.44 * flux density * frequency * winding space factor
  • d) turns per phase = voltage per phase * parallel paths per phase * 4.44 * flux density / frequency * winding space factor
Q.8
What is the formula for current in each conductor?
  • a) current in each conductor = kVA * 103 * 3 * voltage per phase
  • b) current in each conductor = kVA / 103 * 3 * voltage per phase
  • c) current in each conductor = kVA * 103 / 3 * voltage per phase
  • d) current in each conductor = kVA * 103 * 3 / voltage per phase
Q.9
What is the permissible current density in the armature conductors?
  • a) 3-4 A per mm2
  • b) 3-6 A per mm2
  • c) 4-6 A per mm2
  • d) 3-5 A per mm2
Q.10
What is the formula for the area of cross section of armature conductors?
  • a) area of cross section = current per conductor * current density in the armature conductors
  • b) area of cross section = current per conductor + current density in the armature conductors
  • c) area of cross section = current per conductor – current density in the armature conductors
  • d) area of cross section = current per conductor / current density in the armature conductors
0 h : 0 m : 1 s