Chapter 3.2: Electric Motors Part–I: Objective type questions and answers | |The coexistent 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 vigour 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 interest consumption, in case of centrifugal loads (like pump, fan, blower etc.), harmonious 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) two d) None ! | | |What determines the thermal loading on the motor? | | |a) trade/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 detriment to get a full essay, order it on our website:
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