Two automobile headlights are connected in series to a 25 Volts battery each having a resistance of 1.0 Ohm and 2 Ohms respectively. What is the current flowing in the circuit? (in ampere)

Problem 1: A solid steel shaft 5 m long is stressed at 80 MPa when twisted through 4º. Using G = 83 GPa, compute the shaft diameter. What power can be transmitted by the shaft at 20 Hz? (in Kilowatts)

A 150-mm-diameter jet of water is discharging from a nozzle into the air at a velocity of 45 m/s. Find the power in the jet with respect to a datum at the jet.

A Francis turbine of diameter 3.0 m develops 6750 kW at 300 rpm under a net head of 45 m. A geometrically similar model of scale ratio 1: 8 is to be tested at a head of 9 m. Estimate the size, speed discharge and power developed by the model. What is the specific speed of the model? (Assume overall efficiency of 0.82 for both the prototype and model)

A friend returns to the United States from Europe with a 960-W coffeemaker, designed to operate from a 240-V line. She wants to operate it at the USA-standard 120 V by using a transformer. If the secondary coil has 60 turns, what the number of turns in the primary coil? What current will the coffeemaker craw from the 120V line?

1. An unknown lamp placed 6m from a photometer screen provides the same illuminance as a 90 cd lamp placed 4 m from the screen.  What is the candlepower of the unknown lamp? 2. The illuminance of a room 20 ft x 15 ft is being designed.  The illuminance required is 50 footcandles.  What is the total required lumens output of the lamp assuming room and luminaire efficiency of 42%?

Q6 A turbine develops 500 kW power under a head of 100 metres at 200 rpm .What would be its normal speed and output under a head of 81 m ?

↑ 95 m V₁ Türbin 500 The water taken from a stream at an average speed of 5 m/s is transferred to the turbine with a pressure pipe system in order to generate electrical energy. The flow rate of 10 m3/s passing through the pressure pipe is poured into the lake on the downstream side after passing through the turbine. The total irreversible energy loss between points 1 and 2 is determined as 8 m. Calculate the theoretical and actual power of the turbine by taking the efficiency of the turbine- generator group, n = 0.85

One single phase energy meter operating on 230 V and 5 A for 5 hours makes 1940 revolutions. Meter constant in revolution is 400. The power factor of the load will be: