Part–I: Objective type questions and answers
| |The synchronal speed of a motor with 6 poles and operating at 50 Hz frequency is ___. |
| |a) 1500 b) 1000 c) 3000 d) 750 |
| |The efficiency figures for vitality efficient motors (in comparison with standard efficiency motor) can be generally higher by____%.|
| | |
| |a) 1% b) 3-7% c) 10% and above d) 8-10% |
| |The post consumption, in case of centrifugal loads (like pump, fan, blower etc.), proportionate to ____. |
| |a) speed b) square of speed c) cube of speed d) not applicable |
| |Which types of following motors are most efficient?
|
| |a) TEFC b) SPDP c) both d) None |
| |What determines the thermal loading on the motor? |
| |a) traffic/Load cycle b) Temperature of the winding |
| |c) Age of the motor d) ambient conditions |
| |Unbalance in voltages at motor terminals is caused by ____. |
| |a) furnish single phase loads disproportionately b) Use of different...If you loss to get a full essay, order it on our website: Orderessay
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