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Which D.C. motor will be suitable along with flywheel for intermittent light and heavy loads
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A D.C. series motor is that which
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Buses, trains, trolleys, hoists, cranes require high starting torque and therefore make use of
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Usually wide and sensitive speed control is desired in case of
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Which one of the following is not necessarily the advantage of D.C. motors over A.C. motors
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In case the back e.m.f. and the speed of a D.C. motor are doubled, the torque developed by the motor will
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When two D.C. series motors are connected in parallel, the resultant speed is
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Which of the following motor has the poorest speed regulation
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Which of the following law/rule can he used to determine the direction of rotation of D.C motor
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The armature voltage control of D.C. motor provides
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In which of the following applications D.C series motor is invariably tried
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Which of the following motor is preferred for operation in highly explosive atmosphere
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Which D.C. motor has got maximum self loading property
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A direct on line starter is used: for starting motors of
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The speed of a D.C series motor is
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Which D.C. motor is generally preferred for cranes and hoists
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For which of the following applications a D.C. motor is preferred over an A.C. motor
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In D.C. shunt motors as load is reduced
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By looking at which part of the motor, it can be easily confirmed that a particular motor is D.C. motor
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In D.C. motor which of the following can sustain the maximum temperature rise
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For a D.C. shunt motor if the excitation is changed
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Which motor is used where high starting torque and wide speed range control is required
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A three point starter is considered suitable for
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The armature voltage control of D.C. motor provides
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In case the conditions for maximum power for a D.C. motor are established, the efficiency of the motor will be
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Deferentially compound D.C. motors can find applications requiring
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Which one of the following is not the function of pole shoes in a D.C machine
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The speed of a D.C. shunt motor can be increased by
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If the speed of a D.C. shunt motor is increased, the back e.m.f. of the motor will
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The current drawn by the armature of D.C. motor is directly proportional to
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Speed control by Ward Leonard method gives uniform speed variation
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Which of the following load normally needs starting torque more than the rated torque
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Which of the following application requires high starting torque
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At the instant of starting when a D.C. motor is put on supply, it behaves like
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Which D.C. motor is preferred for elevators
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No-load speed of which of the following motor will be highest
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Which of the following method of speed control of D.C. machine will offer minimum efficiency
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In a D.C. shunt motor, speed is
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In case of conductivity compensated D.C. series motors, the compensating winding is provided
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Which motor has the poorest speed control
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In a D.C. shunt motor, under the conditions of maximum power, the current in the armature will be
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The type of D.C. motor used for shears and punches is
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In D.C. machines fractional pitch winding is used
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Three point starter can be used for
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The speed of a D.C. shunt motor more than its full-load speed can be obtained by
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In a D.C series motor, if the armature current is reduced by 50%, the torque of the motor will be equal to
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If a D.C. motor is to be selected for conveyors, which rotor would be preferred
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What will happen if the back e.m.f of a D.C motor vanishes suddenly
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The speed of a D.C. motor can be varied by varying
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In case of D.C. shunt motors the speed is dependent on back e.m.f only because
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