Electrical Machines Objective Questions
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The output power of any electrical motor is taken from the
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In case of a conductively compensated DC series motor, the compensating winding is provided
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When the supply terminal of a DC shunt motor are interchanged
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Consider a separately excited DC motor. If the field current is increased while the armature terminal voltage is held constant, then speed of the motor
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The no load and full load speed of DC mototr are 1400 rpm and 1200 rpm respectively. What is the percentage speed regulation of the motor?
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The speed regulation of a DC motor is given as
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If the back emf in DC motor vanishes suddenly the motor will
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If the load current and flux of a DC motor are held constant and voltage applied across it armature is increased by 5%, the speed of the motor will
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The DC compound motors are generally
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An electric motor with constant output power will have a torque speed characteristics in the form of a
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DC Motor
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In a DC compound motor the field regulator is provided to
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The direction of rotation of a DC compound motor can be reversed by interchanging
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If a DC motor is connected across the AC supply it will
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When the mechanical power is developed by a DC motor maximum
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Rotating part of DC motor is known as
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Rotating part of DC motor is known as
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Speed of DC motor can be controlled by varying
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The current drawn by a 220 V DC series motor of armature resistance 0.5Ω and back back emf 200 V is
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The speed of a DC series motor is
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Direction of rotation of DC motor is reversed by
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Which of following winding is connected in series with armature winding of DC machine?
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With the increase in speed of DC motor
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The output indicate on the name plate of any motor is always the
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If the field winding connection of DC shunt motor is changed
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The direction of rotation of a DC motor can be determent by
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A large series motor is never started without some mechanical on it because otherwise it will
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The armature shaft must be able to with stand
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Eb/V ratio of a DC motor is an indication of
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If the flux of DC motor approaches zero, its speed will
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Electrical Machines - 23
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