ব্যাখ্যা: In a ceiling fan a single phase induction motor is used But we know that single phase induction motor is not a self-starting motor. So it requires some torque for the motor to get started. In this case, a capacitor is used to creat initial torque. The capacitor create a phase differences of 90 degree to the main winding. The two fields which are almost 90 degrees to each other, creates a rotating magnetic field which starts the motor
10. The pressure at the outlet of a refrigerant compressor is called-
ব্যাখ্যা: Discharge pressure (also called high side pressure or head pressure) is the pressure generated on the output side of a gas compressor in a refrigeration or air conditioning system.
ব্যাখ্যা : Air conditioning system or process for controlling the temperature, humidity and sometimes the purity of the air in an interior, as of an office, theater, laboratory or house, especially one capable of cooling.
ব্যাখ্যা: The SI Unit of work is Joule. It is equal to the energy transferred to an object when a force of one newion acts on that object in the direction of the force's motion through a distance of one metre.
ব্যাখ্যা: The freon group of refrigerants are halocarbon refrigerants. In the actual refrigerator, vapors of freon (CCI,F) acts as a refrigerant. They are non inflammable and non-toxic.
19. Electrical appliances are connected in parallel because it-
ব্যাখ্যা: All the appliance get their rated voltage so that they function efficiently. All the components can have their independent switch to control them. If one applience gets faulty, it doesn't affect the other appliances
draws less current
results in reduced power loss
makes the operation of appliances independent of each other