ব্যাখ্যা: ব্যাখ্যা: (i) Cost of electrical energy per kWh is to be minimum (il) Rated voltage and frequency has to be supplied to the consumers. (iii) Reliable power has to be available. (iv) Effective protection system has to be used for isolating the faulty section and keeping other sections healthy. (v) More stable generators are to be used, so that it should not lose synchronism under faulty condition. (iv) Flexible power has to be available.

ব্যাখ্যা: ব্যাখ্যা: In slip-ring induction motor brushes are present due to this frequent maintenance is required. Their design is complicated due to winding, slip-rings and brushes and also expensive. Slip ring induction motor is comparatively having more weight than squirrel case induction motor. The construction of squirrel case induction motor is simple and robust and it is cheap as compared to slip ring induction motor. Therefore squirrel cage induction motor is widely used.

ব্যাখ্যা: ব্যাখ্যা: Condition for maximum efficiency is, copper loss iron loss or variable losses is equal to fixed losses.

ব্যাখ্যা: ব্যাখ্যা: The phenomenon of ionisation of surrounding air around the conductor due to which luminous glow with hissing noise is rise is known as the corona effect. Corona occurs between two transmission lines when they have high potential difference.

ব্যাখ্যা: ব্যাখ্যা: At higher voltage, volume of conductor is reduced. Area of conductor AI/V Where V. Supply voltage. So that material requirement is reduced and hence cost of the material and transmission reduced.

ব্যাখ্যা: ব্যাখ্যা: As the rotor of induction motor is under short circuit, a large voltage induced in it during starting produces a high rotor current which comes through the stator. Therefore the motor draws large current at starting To control the rotor current in squirrel cage motor only option is to go for reduced voltage starting. By using all the above methods we can get the reduced voltage ar starting. These above methods are used as there is no rotor conductor but rotor bars only

ব্যাখ্যা: ব্যাখ্যা: The Sl unit of energy/work is the joule (J), named for English physicist James Prescott Joule.

ব্যাখ্যা: ব্যাখ্যা: Absolute zero is the lowest limit of the thermodynamic temperature scale, a state at which the enthalpy and entropy of a cooled ideal gas reach their minimum value, taken as zero kelvins. The fundamental particles or nature have minimum vibrational motion, retaining only quantum mechanical, zero-point energy-induced particle motion. The theoretical temperature is determined by extrapolating the ideal gas law; by international agreement, absolute zero is taken as-273.15° on the Celsius scale (International System of Units), which equals-459.67° on the Fahrenheit scale (United States customary units or Imperial units). The corresponding Kelvin and Rankine temperature scales set their zero points at absolute zero by definition.

ব্যাখ্যা: ব্যাখ্যা: By contrast, an extensive property of a systent does depend on the system size or the amount of material in the system According to the definitions, density, pressure and temperature are intensive porperties and volume, internal energy are extensive properties.