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Electrical Machines

Electrical Machines
Belt conveyors offer _______________ starting torque.

  zero.
  medium.
  high.
  low.

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Electrical Machines
Series field consists of--------number of turns and ---------- conductors respectively

 large and thin
 large and thick
 less and thin
 less and thick

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Electrical Machines
For a DC machine having P no of pole pairs, Z no of conductors having length L of resistivity ρ and cross section S are arranged. what is the armature resistance for simple wave-winding ?

 PZL/4Sa²
 PZL/4S
 PZL/ 4Sa
 PZL/4Sp²

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Electrical Machines
The armature shaft must be able to with stand

 Bending moment due to weight of the armature.
 Any unbalanced magnetic pull on the armature core.
All of these
 Twisting stains due to transmission of torque.

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Electrical Machines
The volt-ampere euation for a long-shunt compound motor is given by

 Vt = Ea + Ia(ra + rs)
 Vt= Ea + Iara
 Vt= Ea– Iara
 Vt = Ea + Iara+ ILrs

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Electrical Machines
Maximum power will be developed when back emf is

 equal to supply voltage.
 double the supply voltage.
All of these
 half of the supply voltage.

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