Question: D.C. motor is to a drive a load which is almost nil for certain part of the load cycle and peak value for short duration. We will select this______________?

• 1. series motor
• 2. shunt motor
• 3. compound motor
• 4. any of the above

Question: Which D.C. motor has got maximum self relieving property ?

• 1. Series motor
• 2. Shunt motor
• 3. Cumulatively compounded motor
• 4. Differentially compounded motor

Question: In the D.C. motor the iron losses occur in____________?

• 1. the field
• 2. the armature
• 3. the brushes
• 4. the commutator

Question: The speed of a D.C. shunt motor is required to be more than full load speed. This is possible by______________?

• 1. reducing the field current
• 2. decreasing the armature current
• 3. increasing the armature current
• 4. increasing the excitation current

Question: If the load on a DC shunt motor is increases, its speed is slightly reduced due to______________?

• 1. increase in armature current
• 2. increase in flux
• 3. decrease in reactance
• 4. decrease in back emf

Question: In which of the following device the generated emf and armature current are in the opposite directions?

• 1. dc generator
• 2. dc motor
• 3. transformer
• 4. all of the above

Question: With the increase in temperature, the speed of DC shunt motor____________?

• 1. decreases.
• 2. increases
• 3. remain same
• 4. none of the above

Question: With the increase in temperature, the speed of DC series motor______________?

• 1. decreases
• 2. increases
• 3. remain same
• 4. none of the above

Question: If the field winding resistance of a DC shunt motor is increases, its speed will____________?

• 1. decreases
• 2. increases
• 3. remains same
• 4. none of the above

Question: Which of the following method is used for the speed control of DC shunt motor?

• 1. voltage control method
• 2. flux control method
• 3. rheostat control method
• 4. all of the above