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Industrial drives
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. |
Q21 ⇒ In which of the following applications variable speed operation is preferred ? Ceiling fan [other wrong options] [Discuss in forum] Exhaust fan Refrigerator Water pump |
Q22 ⇒ The characteristics of drive for crane hoisting and lowering are which of the following ? All of the above [other wrong options] [Discuss in forum] Precise control Smooth movement Fast speed control |
Q23 ⇒ The diameter of the rotor shaft for an electric motor depends on which of the following Horse power and r.p.m. [other wrong options] [Discuss in forum] r.p.m. only Horse power only Horse power, r.p.m. and power factor |
Q24 ⇒ ____ is preferred for automatic drives. Ward-Leonard controlled D.C. motors [other wrong options] [Discuss in forum] Squirrel cage induction motor Synchronous motors Any of the above |
Q25 ⇒ Which part of a motor needs maximum attention for maintenance ? Bearing [other wrong options] [Discuss in forum] Frame Stator winding Rotor winding |
Q26 ⇒ For which of the following applications 'D.C. motors are still preferred ? Variable speed drive [other wrong options] [Discuss in forum] High efficiency operation Reversibility High starting torque |
Q27 ⇒ In ____ method of starting three phase induction motors the starting voltage is not reduced. slip ring [other wrong options] [Discuss in forum] auto-transformer star-delta any of the above |
Q28 ⇒ Which of the following machines has heavy fluctuation of load ? Punching machine [other wrong options] [Discuss in forum] Printing machine Planer Lathe |
Q29 ⇒ Heavy duty cranes are used in all of the above [other wrong options] [Discuss in forum] ore handling plants steel plants heavy engineering workshops |
Q30 ⇒ Which of the following motors is preferred for boom hoist of a travelling crane ? A.G. slip ring motor [other wrong options] [Discuss in forum] Single phase motor Synchronous motor Ward-Leonard controlled D.C. shunt motor |
Q31 ⇒ Which of the following alternatives will be cheaper ? A 100 H.P. A.C. three phase motor [other wrong options] [Discuss in forum] Four motors of 25 H.P. each Five motors of 20 H.P. each Ten motors of 10 H.P. each |
Q32 ⇒ When the load is above____ a synchronous motor is found to be more economical. 100 kW [other wrong options] [Discuss in forum] 2 kW 20 kW 50 kW |
Q33 ⇒ ____ need frequent starting and stopping of electric motors. Lifts and hoists [other wrong options] [Discuss in forum] Paper mills Grinding mills Air-conditioners |
Q34 ⇒ In a paper mill where constant speed is required individual drive is preferred [other wrong options] [Discuss in forum] synchronous motors are preferred A.C. motors are preferred group drive is preferred |
Q35 ⇒ In jaw crushers a motor has to often start against ____ load. heavy [other wrong options] [Discuss in forum] medium normal low |
Q36 ⇒ For derries and winches which of the following drives can be used ? Any of the above [other wrong options] [Discuss in forum] Pole changing squirrel cage motors D.C. motors with Ward-leonard control A.C. slip ring motors with variable resistance |
Q37 ⇒ The travelling speed of cranes varies from 1 to 2.5 m/s [other wrong options] [Discuss in forum] 20 to 30 m/s 10 to 15 m/s 5 to 10 m/s |
Q38 ⇒ A wound rotor induction motor is preferred, as compared to squirrel cage induction motor, when major consideration is high starting torque [other wrong options] [Discuss in forum] slop speed operation low windage losses all of the above |
Q39 ⇒ The cost of an induction motor will increase as horsepower rating increases but r.p.m. decreases [other wrong options] [Discuss in forum] horsepower rating decreases but r.p.m. increases horsepower rating and operating speed increases horsepower rating and operating speed decreases |
Q40 ⇒ The load cycle for a motor driving a power press will be intermittent and variable load [other wrong options] [Discuss in forum] variable load continuous continuous but periodical |
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