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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. |
Q81 ⇒ The direction of rotation of universal
motor can be reversed by interchanging- the brush leads [other wrong options] [Discuss in forum] switching over from A.C. to D.C. reversing the supply- terminals any of the above |
Q82 ⇒ Which motor will make least noise ? Hysteresis motor [other wrong options] [Discuss in forum] Capacitor motor Shaded-pole motor Universal motor |
Q83 ⇒ Which of the following statements
regarding repulsion induction motor is
incorrect ? It employs centrifugally-operated mechanism to short-circuit the commutator [other wrong options] [Discuss in forum] At rated load, it runs at almost
synchronous speed At start as well as a low speeds, most of the torque is produced by repulsion winding At starting, squirrel-cage winding produces no torque. |
Q84 ⇒ In capacitor start single-phase motors current in the starting winding leads the voltage [other wrong options] [Discuss in forum] current in the starting winding lags
the voltage current in the starting winding is in phase with voltage in running winding none of the above |
Q85 ⇒ centrifugal switch is used to disconnect
starting winding when motor has picked up about 50 to 70 per cent of rated speed [other wrong options] [Discuss in forum] run for about 1 minute run for about 5 minutes picked up about 10 to 25 per cent of rated, speed |
Q86 ⇒ The direction of rotation of an SHADED POLE
motor is determined by position of shaded pole with respect to main pole [other wrong options] [Discuss in forum] interchanging the supply leads retentivity of the rotor material none of these |
Q87 ⇒ Which of the following motor will give
the highest starting torque ? Schrage motor [other wrong options] [Discuss in forum] D.C. shunt motor Repulsion start and induction run motor Universal motor |
Q88 ⇒ In split-phase motor auxiliary winding
is of thin wire placed at the top of the slots [other wrong options] [Discuss in forum] thick wire placed at the bottom of
the slots thick wire placed at the top of the slots thin wire placed at the bottom of the slots |
Q89 ⇒ In case of high speed universal motor
which of the following needs more attention
? Balancing of rotor [other wrong options] [Discuss in forum] End play Air gap Insulation in rotor |
Q90 ⇒ In which single-phase motor, the rotor
has no teeth or winding ? Hysteresis motor [other wrong options] [Discuss in forum] Split phase motor Reluctance motor Universal motor |
Q91 ⇒ Torque developed by a single phase induction
motor at starting is nil [other wrong options] [Discuss in forum] pulsating uniform none of the above |
Q92 ⇒ The purpose of stator winding in the
compensated repulsion motor is to improve power factor and provide better speed regulation [other wrong options] [Discuss in forum] provide mechanical balance prevent hunting in the motor eliminate armature reaction |
Q93 ⇒ Which of the following statements
regarding two value capacitor motor is
incorrect ? It is preferred to permanent-split single-value capacitor motor where frequent reversals are required [other wrong options] [Discuss in forum] It is a reversing motor It has low starting as well as rushing currents It has high starting torque |
Q94 ⇒ Which of the following motors has two
separate windings on the motor ? Repulsion induction motor [other wrong options] [Discuss in forum] Repulsion motor Repulsion start induction run motor None of the above |
Q95 ⇒ Which of the following statements
regarding single-phase induction motor
is correct ? It is not self-starting [other wrong options] [Discuss in forum] It requires only one winding It can rotate in one direction only It is self-starting |
Q96 ⇒ In a split-phase motor the ratio of number
of turns for starting winding to that
for running winding is less than one [other wrong options] [Discuss in forum] more than one one two |
Q97 ⇒ Which of the following is most economical
method of starting a single-phase
induction motor '? Capacitance-start method [other wrong options] [Discuss in forum] Inductance-start method Split-phase method Resistance-start method |
Q98 ⇒ Which motor is relatively free from
mechanical and magnetic vibrations ? Hysteresis motor [other wrong options] [Discuss in forum] Shaded-pole motor Universal motor Reluctance motor |
Q99 ⇒ Whic,h statement about resistancestart
split-phase motor is incorrect ? The two stator windings are connected in series across the supply [other wrong options] [Discuss in forum] It is non-reversible The main winding has low resistance but high reactance It has two stator windings called main and starting windings Starting winding has high resistance but low reactance |
Q100 ⇒ In a capacitor start and run motors the
function of the running capacitor in
series with the auxiliary winding is to improve power factor [other wrong options] [Discuss in forum] increase overload capacity reduce fluctuations in torque to improve torque |
Or |