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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. |
Q41 ⇒ Which feature, while selecting a,motor for centrifugal pump, will be of least significance ? Speed control [other wrong options] [Discuss in forum] Starting characteristics Operating speed Horse power |
Q42 ⇒ A reluctance motor ____ is compact [other wrong options] [Discuss in forum] is provided with slip rings requires starting gear has high cost |
Q43 ⇒ For a motor-generator set which of the following motors will be preferred ? Synchronous motor [other wrong options] [Discuss in forum] Slip ring induction motor, Pole changing induction motor Squirrel cage induction motor |
Q44 ⇒ Battery operated scooter for braking uses mechanical braking [other wrong options] [Discuss in forum] plugging regenerative braking rheostatic braking |
Q45 ⇒ Besides a constant speed a synchronous rotor possesses which of the following advantages ? High power factor [other wrong options] [Discuss in forum] Lower cost Better efficiency All of the above |
Q46 ⇒ Which of the following motors has series characteristics ? Repulsion motor [other wrong options] [Discuss in forum] Shaded pole motor Capacitor start motor None of the above |
Q47 ⇒ In series motor which of the following methods can be used for changing the flux per pole ? Any of the above [other wrong options] [Discuss in forum] Tapped field control Diverter field control Series-parallel control |
Q48 ⇒ Light duty cranes are used in which of the following ? All of the above [other wrong options] [Discuss in forum] Power houses Pumping stations Automobile workshops |
Q49 ⇒ ____ motor is a constant speed motor. Synchronous motor [other wrong options] [Discuss in forum] Schrage motor Induction motor Universal motor |
Q50 ⇒ The size of an excavator is usually expressed in terms of cubic metres [other wrong options] [Discuss in forum] crowd' motion angle of swing travel in metres |
Q51 ⇒ Which of the following motors is usually preferred for kiln drives ? Any of the above [other wrong options] [Discuss in forum] Cascade controlled A.C. motor Slip ring induction motor Three phase shunt wound commutator motor |
Q52 ⇒ ____ has least range of speed control. Synchronous motor [other wrong options] [Discuss in forum] Slip ring induction motor D.C. shunt motor Schrage motor |
Q53 ⇒ By the use of which of the following D.C. can be obtained from A.C. ? Any of the above [other wrong options] [Discuss in forum] Silicon diodes Mercury arc rectifier Motor generator set |
Q54 ⇒ Which of the following happens when star-delta starter is used ? Both (a) and (b) [other wrong options] [Discuss in forum] Starting voltage is reduced Starting current is reduced None of the above |
Q55 ⇒ For a particular application the type of electric and control gear are determined by which of the following considerations? All of the above [other wrong options] [Discuss in forum] Starting torque Conditions of environment Limitation on starting current Speed control range and its nature |
Q56 ⇒ While selecting an electric motor for a floor mill, which electrical characteristics will be of least significance ? Braking [other wrong options] [Discuss in forum] Running characteristics Starting characteristics Efficiency |
Q57 ⇒ The starting torque in case of centrifugal pumps is generally less than running torque [other wrong options] [Discuss in forum] same as running torque slightly more than running torque double the running torque |
Q58 ⇒ For blowers which of the following motors is preferred ? Squirrel cage induction motor [other wrong options] [Discuss in forum] D.C. series motor D.C. shunt motor Wound rotor induction motor |
Q59 ⇒ Heat control switches are used in cooling ranges [other wrong options] [Discuss in forum] transformers three phase induction motors single phase |
Q60 ⇒ ____ has the least value of starting torque to full load torque ratio. Squirrel cage induction motor [other wrong options] [Discuss in forum] D.C. shunt motor D.C. series motor Slip ring induction motor |
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