Question: In a D.C. generator the critical resistance can be increased by_____________?

• 1. increasing its field resistance
• 2. decreasing its field resistance
• 3. increasing its speed
• 4. decreasing its speed

Question: In a D.C. generator:___________________?

• 1. external resistance = internal char-acteristic – armature reaction
• 2. internal characteristic = magnetisation characteristic – ohmic drop
• 3. external characteristic = magnetisation characteristic – ohmic drop – armature reaction
• 4. magnetisation characteristic = external characteristic

Question: The number of armature parallel paths in a two-pole D.C. generator having duplex lap winding is______________?

• 1. 2
• 2. 4
• 3. 6
• 4. 8

Question: Wave winding is composed of_______________?

• 1. any even number of conductors
• 2. any odd number of conductors
• 3. that even number which is exact multiple of poles + 2
• 4. that even number which is exact multiple of poles

Question: For both lap and wave windings, there are as many commutator bars as the number of_____________?

• 1. slots
• 2. armature conductors
• 3. winding elements
• 4. poles

Question: In a separately excited generator supplying rated load the armature reaction.

• 1. is always present
• 2. is always absent
• 3. may be sometimes present
• 4. none of the above

Question: The series field of a short-shunt D.C. generator is excited by_______________?

• 1. external current
• 2. armature current
• 3. shunt current
• 4. load current

Question: The critical resistance of the D.C. generator is the resistance of_____________?

• 1. field
• 2. brushes
• 3. armature
• 4. load

Question: As a result of armature reaction, the reduction in the total mutual air gap flux in a D.C. generator is approximately______________?

• 1. 40 percent
• 2. 25 percent
• 3. 10 percent
• 4. 5 percent

Question: Shunt generators are most suited for stable parallel operation because of their______________?

• 1. rising voltage characteristics
• 2. identical voltage characteristics
• 3. drooping voltage characteristics
• 4. linear voltage characteristics