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1-Dont try to cram or spend more time here just read it fast and cover syllabus then practice MCQ's cheptor of same topic to check your progress. . |
2-Wrong options are also given but dont concentrate there, Right answer is in bold format. |
Q61 ⇒ Which of the following motors is preferred when quick speed reversal is the main consideration ? D.C. motor [other wrong options] [Discuss in forum] Squirrel cage induction motor Wound rotor induction motor Synchronous motor |
Q62 ⇒ For a D.C. shunt motor which of the following is incorrect ? Unsuitable for heavy duty starting [other wrong options] [Discuss in forum] Torque varies as armature current Torque-armature current is a straight line Torque is zero for zero armature current |
Q63 ⇒ The selection of an electric motor for any application depends on which of the following factors ? All of the above [other wrong options] [Discuss in forum] Electrical characteristics Mechanical characteristics Size and rating of motors Cost |
Q64 ⇒ Which of the following motors are preferred for overhead travelling cranes ? Short time rated motors [other wrong options] [Discuss in forum] Slow speed motors Continuous duty motors None of the above |
Q65 ⇒ Which of the following motors are best for the rolling mills ? D.C. motors [other wrong options] [Discuss in forum] Single phase motors Squirrel cage induction motors Slip ring induction motors |
Q66 ⇒ Belted slip ring induction motor is almost invariably used for jaw crushers [other wrong options] [Discuss in forum] water pumps centrifugal blowers none of the above |
Q67 ⇒ ____ has relatively wider range of speed control. D.C. shunt motor [other wrong options] [Discuss in forum] Synchronous motor Ship ring induction motor Squirrel cage induction motor |
Q68 ⇒ In case of ____ speed control by injecting e.m.f. in the rotor circuit is possible. slip ring induction motor [other wrong options] [Discuss in forum] d.c. shunt motor schrage motor synchronous motor |
Q69 ⇒ Which of thefollowing motors is preferred when smooth and precise speed control over a wide range is desired ? D.C. motor [other wrong options] [Discuss in forum] Squirrel cage induction motor Wound rotor induction motor Synchronous motor |
Q70 ⇒ For which of the following applications motor has to start with high acceleration? Lifts and hoists [other wrong options] [Discuss in forum] Oil expeller Floor mill Centrifugal pump |
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