Electrical Machines How can the synchronous speed of a 3 - Φ IM be varied? By varying supply voltage. Both (A) and (B). By varying number of poles. By varying the supply frequency. By varying supply voltage. Both (A) and (B). By varying number of poles. By varying the supply frequency. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A three phase induction motor has a synchronous speed of 1500 rpm the machine runs at 1460 rpm at a particular load. The slip at this load is ___________. 30 %. 5 %. 2.67 %. 1.5 %. 30 %. 5 %. 2.67 %. 1.5 %. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A commutator in DC machines can 1. provide half-wave rectification 2. Provide full-wave rectification 3. convert ac to dc 4. Convert dc to ac 5. provide controlled full-wave rectification From these, the correct answer is 1, 2, 3 2, 3 ,5 2, 3, 4 2, 3, 4, 5 1, 2, 3 2, 3 ,5 2, 3, 4 2, 3, 4, 5 ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of the following machine will have maximum efficiency? Electrical power transformer. DC motor. Electrical power generator. Induction motor. Electrical power transformer. DC motor. Electrical power generator. Induction motor. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of the following methods are used to control the speed of DC motors is supply voltage control All of these armature circuit resistance control field current control supply voltage control All of these armature circuit resistance control field current control ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The armature shaft must be able to with stand Twisting stains due to transmission of torque. Bending moment due to weight of the armature. All of these Any unbalanced magnetic pull on the armature core. Twisting stains due to transmission of torque. Bending moment due to weight of the armature. All of these Any unbalanced magnetic pull on the armature core. ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS