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

Question: A dc series motor should not be started on no load because it would___________?

• 1. not develop starting torque
• 2. fail to start without load
• 3. run at dangerously high speed
• 4. draw more current without producing sufficient torque

Question: In a DC motor the inter-pole winding is connected in________________?

• 1. series with field winding
• 2. series speed armature winding
• 3. parallel big field winding
• 4. parallel with armature winding

Question: Armature reaction in dc motor results___________?

• 1. decrease in speed
• 2. increase in speed
• 3. short circuit
• 4. open circuit

Question: Which of the following test can be performed on DC series motor?

• 1. Swinburne test
• 2. Hopkinson test
• 3. Brake test
• 4. Field test

Question: Ward Leonard method of speed control is basically a______________?

• 1. field control method
• 2. armature controlled method
• 3. field diverter
• 4. frequency control method