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Consider the following properties regarding insulation for cables: 1. A low specific resistance 2. High temperature withstand 3. High dielectric strength Which of the above properties of insulation are correct while using cables?
A hot fluid is being conveyed through a long pipe of 4 cm outer diameter and covered with 2 cm thick insulation. It is proposed to reduce the conduction heat loss to the surroundings to one-third of the present rate by further covering with same insulation. Calculate the additional thickness of insulation
A 10 cm dia steam pipe, carrying steam at 180°C, is covered with an insulation (conductivity = 0.6 W/m.°C). It losses heat to the surroundings at 30°C. Assume a heat transfer co-efficient of 0.8 W/m2.°C for heat transfer from surface to the surroundings. Neglect wall resistance of the pipe and film resistance of steam. If the insulation thickness is 2 cms, the rate of heat loss from this insulated pipe will be
Consider a three-phase. 50 Hz, 11 kV distribution system, Each of the conductors is suspended by an insulator string having two identical porcelain insulators. The self-capacitance of the insulator is 5 times the shunt capacitance between the link and the ground, as shown in the figure. The voltage across the two insulators are
Which of the following has to be considered for overhead/underground electrical power transmission / distribution system? a) The voltage at the consumer’s premises must be maintained within ± 4 or ± 6% of the declared voltage. b) The transmission cost should be unduly excessive. c) The insulation resistance of the whole system should be very high d) The loss of power in the system itself should be a small percentage (about 10%) of the power transmitted.
Which device is used to measure the Insulation resistance without damaging the insulation?
Given below are the statements about the difference between passive resistance and satyagraha. Which ones are true?  (A) Passive resistance is weapon of the weaker sections, satyagraha never desires to terrorise the opponent (B) Passive Resistance is negative in practice, whereas satyagraha is positive morality (C) Passive Resistance is equivalent to satyagraha (D) Passive Resistance is not afraid of the physical strength while satyagraha is afraid of physical strength Choose the correct answer from the options given below:
An amplifier is measured to have an internal resistance of 10 kΩ, voltage gain of 100V/V and output resistance of 100 Ω. Also, when a load resistance of 1 kΩ is connected between the output resistance if found to decrease to 8 kΩ. If the amplifier is fed with the signal source having an internal resistance of 2 kΩ. Find Gm.
An amplifier is measured to have an internal resistance of 10 kΩ, voltage gain of 100V/V and output resistance of 100 Ω. Also, when a load resistance of 1 kΩ is connected between the output resistance if found to decrease to 8 kΩ. If the amplifier is fed with the signal source having an internal resistance of 2 kΩ. Find Av.
An amplifier is measured to have an internal resistance of 10 kΩ, voltage gain of 100V/V and output resistance of 100 Ω. Also, when a load resistance of 1 kΩ is connected between the output resistance if found to decrease to 8 kΩ. If the amplifier is fed with the signal source having an internal resistance of 2 kΩ. Find Gvo.