Question: The starting torque of a D.C. motor is independent of which of the following?

• 1. Flux
• 2. Armature current
• 3. Flux and armature current
• 4. Speed

Question: need frequent starting and stopping of electric motors ?

• 1. Paper mills
• 2. Grinding mills
• 3. Air-conditioners
• 4. Lifts and hoists

Question: Which of the following motors are best for the rolling mills ?

• 1. Single phase motors
• 2. Squirrel cage induction motors
• 3. Slip ring induction motors
• 4. DC motors

Question: For which of the following applications D.C. motors are still preferred ?

• 1. High efficiency operation
• 2. Reversibility
• 3. Variable speed drive
• 4. High starting torque

Question: ___________________is not a part of ball bearing ?

• 1. Inner race
• 2. Outer race
• 3. Cage
• 4. Bush

Question: The starting torque in case of centrifugal pumps is generally_________________?

• 1. less than running torque
• 2. same as running torque
• 3. slightly more than running torque
• 4. double the running torque

Question: Which part of a motor needs maximum attention for maintenance ?

• 1. Frame
• 2. Rearing
• 3. Stator winding
• 4. Rotor winding

Question: Which feature, while selecting a motor for centrifugal pump, will be of least significance ?

• 1. Starting characteristics
• 2. Operating speed
• 3. Horse power
• 4. Speed control

Question: Ward-Leonard controlled D.C. drives are generally used for _____________________ excavators?

• 1. Light duty
• 2. Medium duty
• 3. Heavy duty
• 4. All of the above

Question: For a particular application the type of electric-and control gear are determined by which of the following considerations ?

• 1. Starting torque
• 2. Conditions of environment
• 3. Limitation on starting current
• 4. All of the above