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Home⇒ Engineering⇒
Single phase induction motors
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 ⇒ The electric motor used in portable drills is universal motor [other wrong options] [Discuss in forum] capacitor run motor hysteresis motor repulsion motor |
Q42 ⇒ The shaded pole motor is used for low starting torque [other wrong options] [Discuss in forum] high starting torque medium starting torque very high starting torque |
Q43 ⇒ Starting winding of a single phase
motor of a refrigerator is disconnected
from the circuit by means of a magnetic relay [other wrong options] [Discuss in forum] thermal relay centrifugal switch none of the above |
Q44 ⇒ Which of the following statements
regarding reluctance-start motor is incorrect
? It is similar to reluctance motor [other wrong options] [Discuss in forum] It is basically an induction motor
and not a synchronous one So far as its basic working principle is concerned, it is similar to shaded pole motor the air-gap between rotor and salient poles is non- uniform |
Q45 ⇒ The capacitors used in, single-phase
capacitor motors have no polarity marking [other wrong options] [Discuss in forum] voltage rating dielectric medium definite value |
Q46 ⇒ Speed control of a universal motor is
achieved by all of the above methods [other wrong options] [Discuss in forum] varying field flux with tapped field
windings connecting rheostat in series applying variable voltage by means of silicon cofitrolled rectifier applying variable voltage by means of variable auto-transformer |
Q47 ⇒ Which of the following applications
would need the smallest size of motor ? Electric clock [other wrong options] [Discuss in forum] Table fan Sewing machine Domestic mixi |
Q48 ⇒ If a single-phase motor runs hot the
probable cause cannot be blown fuses [other wrong options] [Discuss in forum] low voltage high voltage shorted stator coils |
Q49 ⇒ Which of the following motors is
generally used for electric shavers ? Universal motor [other wrong options] [Discuss in forum] Shaded-pole motor Reluctance motor Hysteresis motor |
Q50 ⇒ By pushing and pulling the rotor shaft
of a motor, we can check its end play [other wrong options] [Discuss in forum] side play firmness of mounting free shaft movement none of the above |
Q51 ⇒ A motor gets overheated due to all of the above [other wrong options] [Discuss in forum] dry bearings overloads worn bearings shorted winding |
Q52 ⇒ In a split phase motor, the running
winding should have low resistance and high inductance [other wrong options] [Discuss in forum] high resistance and low inductance high resistance as well as high inductance low resistance as well as low inductiance |
Q53 ⇒ In a shaded pole motor, the shading coil
usually consist of a single turn of heavy copper wire which is short-circuited and carries only induced current [other wrong options] [Discuss in forum] a single turn of heavy wire which is
in parallel with running winding a multilayer fine gauge copper wire in parallel with running winding none of the above |
Q54 ⇒ Which of the following motors is used
in mixies ? Universal motor [other wrong options] [Discuss in forum] Repulsion motor Reluctance motor Hysteresis motor |
Q55 ⇒ A shaded pole motor can be used for any of the above [other wrong options] [Discuss in forum] toys hair dryers circulators |
Q56 ⇒ Which of the following single-phase
motors is suitable for timing and control
purposes ? Reluctance motor [other wrong options] [Discuss in forum] Series motor Repulsion motor Universal motor |
Q57 ⇒ The repulsion-start induction-run motor
is used because of high starting torque [other wrong options] [Discuss in forum] good power factor high efficiency minimum cost |
Q58 ⇒ VVhen a D.C. series motor is connected
to A.C. supply, the power factor will be
low- because of high inductance of field and armature circuits [other wrong options] [Discuss in forum] induced current in rotor due to
variations of flux fine copper wire winding none of the above |
Q59 ⇒ Which of the following applications
always have
switched on ? Pistol drills [other wrong options] [Discuss in forum] Vacuum cleaners Fan motors All of the above |
Q60 ⇒ The rotor slots, in an induction motor,
are usually not quite parallel to the
shaft because it helps in reducing the tendency of the rotor teeth to remain under the stator teeth [other wrong options] [Discuss in forum] improves the efficiency helps the rotor teeth t,o remain under the stator teeth improves the power factor |
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