Electrical Engg (EEE) - MCQ Practice Questions
Practice free Electrical Engg (EEE) multiple-choice questions with detailed answers and explanations. Perfect for competitive exam preparation.
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What is the synchronous speed of a 6-pole, 3-phase induction motor operating at 50 Hz frequency?
The slip of an induction motor at rated load is typically in the range of:
Which type of DC motor provides excellent speed control characteristics and is suitable for cranes and hoists?
In a 3-phase transformer with Delta-Star connection, the secondary voltage phase angle leads the primary by:
The copper loss in a transformer is minimum when:
What is the relationship between electrical and mechanical power in a DC motor running at steady state?
An induction motor is running at a slip of 4%. If the synchronous speed is 1500 RPM, the actual rotor speed is:
In a synchronous motor, the angle between stator MMF and rotor MMF at full load is:
Which statement is correct regarding the torque-slip characteristic of a squirrel-cage induction motor?
A 3-phase, 50 Hz, 4-pole synchronous motor operates at rated speed. The excitation is reduced by 20%. What happens?
The no-load core loss in a transformer is primarily due to:
In a DC generator, armature reaction causes the neutral plane to:
A 3-phase induction motor draws 50 A at 0.7 lagging power factor when running at full load. What is the reactive power?
The primary advantage of a brushless DC motor (BLDC) over conventional DC motor is:
In a transformer under short-circuit test, the secondary is short-circuited and primary voltage is reduced to make rated current flow. The measured power is the:
A 8-pole, 3-phase induction motor is required to run at approximately 720 RPM at 50 Hz. The approximate slip required is:
In a synchronous generator connected to an infinite bus, if the excitation is increased beyond rated value:
Which of the following statements about a DC shunt motor is true?
The efficiency of a squirrel-cage induction motor improves with increasing load mainly because:
A DC motor is running at 1500 rpm with an armature current of 20 A. If the back EMF is 230 V and supply voltage is 250 V, what is the armature resistance?