Q1:- To develop the electromagnetic force and/or torque in electro mechanical energy conversion system act in a direction that tends
Q2:- What is the effect produced by the electric current in an electric motor?
Q3:- The rotating part of d.c. motors is known as
Q4:-If the current carrying coil is placed in a uniform magnetic field direction of magnetic induction then
Q5:-Why is the air gape b/w the yoke and armature of an electric motor kept smalle?
- to increase the stored energy at constant flux
- to decrease the stored energy at constant flux
- to decrease the coenergy at constant mmf
- to decrease the stored energy at constant mmf
Q2:- What is the effect produced by the electric current in an electric motor?
- magnetic effect only
- magnetic as well as heating effect
- heating efeect only
- heating as wel as chemical effect.
Q3:- The rotating part of d.c. motors is known as
- pole
- stator
- armature
- carbon brush
Q4:-If the current carrying coil is placed in a uniform magnetic field direction of magnetic induction then
- the net force and torque on the coil are both zero
- the net force is zero but torque is finite
- the net force is finite but torque is zero
- the net force and torque are both finite
Q5:-Why is the air gape b/w the yoke and armature of an electric motor kept smalle?
- to achieve a stronger magnetic field
- to avoid overheating of the machine
- to make sataion easier
- none
Q6:-The function of the commutator in a d.c. machine is ?
Q7:- Carbon brushes are used in electrical motors to
Q8:-D.C. shunt generator has
Q9:- which of the following generator is used for charging batteries?
Q10:- Conditions for maximum power output for a d.c. motor is
- to change alternating current to direct current
- to improve commutation
- for easy speed control
- to change alternating voltage to direct voltage
Q7:- Carbon brushes are used in electrical motors to
- brush off carbon deposits on the commutator
- provide a path for flow of current
- prevent overheating of armature winding
- prevent sparking during commutation
Q8:-D.C. shunt generator has
- slightly drooping characteristics
- appreciable rising characteristics
- constant voltage charactersitics
- appreciable falling characteristics
Q9:- which of the following generator is used for charging batteries?
- compound generators
- shunt generators
- series generators
- tacho generators
Q10:- Conditions for maximum power output for a d.c. motor is
- back emf =applied voltage
- back emf= half of applied voltage
- back emf= armature current*armature resistance
- back emf =0.5 *armature current
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