1) Which of the following motors is used for elevators ? a. Induction motor b. Synchronous motor c. Capacitor start single phase motor d. Any of the above
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2) ________________ motor is a constant speed motor? a. Synchronous motor b. Schrage motor c. Induction motor d. Universal motor
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3) The starting torque of a D.C. motor is independent of which of the following? a. Flux b. Armature current c. Flux and armature current d. Speed
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4) need frequent starting and stopping of electric motors ? a. Paper mills b. Grinding mills c. Air-conditioners d. Lifts and hoists
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5) Which of the following motors are best for the rolling mills ? a. Single phase motors b. Squirrel cage induction motors c. Slip ring induction motors d. D.C. motors
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6) For which of the following applications D.C. motors are still preferred ? a. High efficiency operation b. Reversibility c. Variable speed drive d. High starting torque
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7) ___________________is not a part of ball bearing ? a. Inner race b. Outer race c. Cage d. Bush
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8) The starting torque in case of centrifugal pumps is generally_________________? a. less than running torque b. same as running torque c. slightly more than running torque d. double the running torque
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9) Which part of a motor needs maximum attention for maintenance ? a. Frame b. Rearing c. Stator winding d. Rotor winding
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10) Which feature, while selecting a.motor for centrifugal pump, will be of least significance ? a. Starting characteristics b. Operating speed c. Horse power d. Speed control
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