Q3. Write if the shown statements are TRUE or FALSE. 1- In DC machine the induced e.m.f is proportional with flux only. 2- The Ta/l a graph of a d.c. series motor is a straight line throughout. 3- In a DC motor the direction of the shaft rotation can be change by changing the polarity of the power supply.

The armature of a 4 -polelap wound shunt generator has 400 conductors.The flux per pole is 0.05 Wb.The armature and field resistance are 0.05Qand 500. Find the speed of the machine when supplying 450 A at a terminal voltage of 250 V.

An 8- pole dc generator has 500 armature conducters and a useful flux of 0.05 Wb. A. What will be the emf generated, if it is lap- connected and runs at 1200 rpm? B. What must be the speed at which it is to be driven to produce the same emf if it is wave wound.

The torque in AC machines depends on Select one: a. The strength of the rotor magnetic field b.The strength of the external magnetic field c.The sin of the angle between the rotor magnetic field and the external magnetic field d.A constant representing the construction of the machine e.All of above Clear my choice

A six-pole dc machine has an armature connected as a lap winding. The armature has 32 slots with six conductors per slot. The armature is rotated at 600 rpm, and the flux per pole is 30 mWb. Calculate the induced voltage. 1

6. Calculate the flux in a 4-pole dynamo with 722 armature conductors generating 500 V when running at 1000 r.p.m. when the armature is (a) lap connected (b) wave connected. Subject: Electrical Machine 1

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