301-400

301. Two inductor coils in very close proximity; if one of the coils is rotated 90 degrees slowly away from the other the mutual inductance (Level 1)

• a) Decreases
• b) Remains the same
• c) Increases.

302. Two inductor coils in very close proximity; If the angle is 0 degree the magnetic flux which is generated by coil 1 will hit coil 2 in an optimal way. Coil 2 will have: (Level 2)

• a) A no voltage.
• b) The maximum possible voltage
• c) A lower voltage

303. Two inductor coils in very close proximity; If the angle is 45 degree the magnetic flux which is generated by coil 1 will hit coil 2 in an optimal way. Coil 2 will have: (Level 2)

• a) A no voltage.
• b) The maximum possible voltage
• c) A lower voltage

304. Which statement is correct? (Level 1)

• a) Current transformers allow the measurement of AC currents without breaking the current−carrying leads
• b) Current transformers allow the measurement of AC voltage without breaking the current−carrying leads
• c) Current transformers allow the measurement of DC voltage without breaking the current−carrying leads

305. Which methods are applied to control the speed of DC machines in practice? (Level 1)

• a) Voltage control and Field Control
• b) Voltage control
• c) Field Control

306. The stationary part of a electrical machine is (Level 1)

• a) Magnetic flux
• b) Stator
• c) Rotor

307. The rotating part of a electrical machine is (Level 1)

• a) Magnetic flux
• b) Stator
• c) Rotor

308. The induced voltage increases proportional to: (Level 2)

• a) Magnetic field strength, speed of movement and the length of the conductor
• b) Speed of movement, the length of the conductor
• c) Magnetic field strength, speed of movement

309. How many part the rotor of a electrical machine has? (Level 2)

• a) 1
• b) 3
• c) 2

310. In a DC motor, the stator's magnetic field, due to armature reaction, moves (Level 2)

• a) Into alignment with the GNA
• b) In the same direction of rotation of the armature
• c) In the opposite direction of rotation of the armature