Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Please briefly explain why you feel this question should be reported.
Please briefly explain why you feel this answer should be reported.
Please briefly explain why you feel this user should be reported.
What is the relation between the output coefficient to the volume of active parts in a rotating electric machine?
Answer: b Explanation: The output coefficient and the volume of active parts in a rotating electric is inversely proportional to each other. Thus, the size of the machine decreases with an increase in output coefficient.
Answer: b
See lessExplanation: The output coefficient and the volume of active parts in a rotating electric is inversely proportional to each other. Thus, the size of the machine decreases with an increase in output coefficient.
How will the size and cost of a rotating electric machine be if it is designed with greater speed?
Answer: b Explanation: The rotating electric machine designed with greater speed will have a smaller size and lesser cost compared to other machines giving the same output but designed at lesser speeds. This is because the volume of active parts of the machine varies inversely with speed.
Answer: b
Explanation: The rotating electric machine designed with greater speed will have a smaller size and lesser cost compared to other machines giving the same output but designed at lesser speeds. This is because the volume of active parts of the machine varies inversely with speed.
See lessWhat determines the output of a dc electric machine?
Answer: c Explanation: The dc electric machine output is the product of Total Magnetic loading, Total Electric loading, and speed in rps. Thus the output depends on total loadings.
Answer: c
Explanation: The dc electric machine output is the product of Total Magnetic loading, Total Electric loading, and speed in rps. Thus the output depends on total loadings.
See lessWhat are the main dimensions of a rotating electric machine?
Answer: c Explanation: The armature is the part of the machine that carries AC. The main dimensions in a rotating electric machine are said to be the Armature diameter and Armature core length.
Answer: c
See lessExplanation: The armature is the part of the machine that carries AC. The main
dimensions in a rotating electric machine are said to be the Armature diameter and
Armature core length.
What kind of materials are used to design electrical heating devices?
Answer: b Explanation: High resistive materials are used to make resistances or heating devices as we require to dissipate electrical energy as heat. These are generally obtained by using an alloy of different metals.
Answer: b
See lessExplanation: High resistive materials are used to make resistances or heating devices as we require to dissipate electrical energy as heat. These are generally obtained by using an alloy of different metals.
What kind of emf is produced in an electric machine when the coil is stationary and flux varies with time?
Answer: a Explanation: Transformer emf also called the pulsational emf is produced when the coil is stationary and flux varies with time. No energy conversion takes place in this process. This kind of emf is generated in a transformer.
Answer: a
See lessExplanation: Transformer emf also called the pulsational emf is produced when the coil is stationary and flux varies with time. No energy conversion takes place in this process. This kind of emf is generated in a transformer.
How should be the magnetic and electrical loadings in a highly efficient electric machine?
Answer: a Explanation: To reduce operating costs the efficiency of the machine must be made higher. The magnetic and electrical loadings in a highly efficient electric machine must be small and use more material.
Answer: a
See lessExplanation: To reduce operating costs the efficiency of the machine must be made
higher. The magnetic and electrical loadings in a highly efficient electric machine must be small and use more material.
Which of the following factor mainly determines the type of insulation for an electrical machine?
Answer: b Explanation: Temperature rise affects the life of the insulation which can further reduce the operating life of the machine. Thus, maximum operating temperature determines the type of insulation for an electrical machine.
Answer: b
See lessExplanation: Temperature rise affects the life of the insulation which can further reduce the operating life of the machine. Thus, maximum operating temperature determines the type of insulation for an electrical machine.
Which of the following kind of conductors will require thicker insulation?
Answer: a Explanation: Maximum voltage stress and mechanical stress is necessary to determine the size of insulation. Thus, if two electrical machines operate at the same voltage, large-sized conductors will need thicker insulation.
Answer: a
See lessExplanation: Maximum voltage stress and mechanical stress is necessary to determine the size of insulation. Thus, if two electrical machines operate at the same voltage, large-sized conductors will need thicker insulation.
What must be mainly ensured to keep the temperature rise within limits?
Answer: b Explanation: Temperature rise will affect the life of the insulation. Thus, proper coolingand ventilation must be ensured according to electric machine design to keep the temperature rise within limits. The coolant flowing will absorb the heat from machine parts.
Answer: b
See lessExplanation: Temperature rise will affect the life of the insulation. Thus, proper coolingand ventilation must be ensured according to electric machine design to keep the temperature rise within limits. The coolant flowing will absorb the heat from machine parts.