a) Induction motor b) Dc series motor c) Dc shunt motor d) Synchronous motor Ans: (b)
a) Low R and low X b) Low R and high X c) High R and high X d) High R and low X Ans: (b)
a) 0° b) 60° c) 90° d) 120° Ans: (c)
a) Speed of the rotor b) Input to prime mover c) Rotor excitation d) Coupling angle Ans: (c)
a) Number of pole alone b) Frequency of the supply alone c) Input voltage d) Number of poles and frequency of supply Ans: (d)
a) Rotary compressors b) Cranes c) Lathe machines d) None of these Ans: (a)
a) Magnetizing current to ideal short circuit current b) Magnetizing current to supply voltage c) Open circuit voltage to short circuit current for the same excitation d) None of these Ans: (a)
a) Large number of open slots in stator b) Large number of narrow slots in stator c) small number of open slots in stator d) Small number of narrow slots in stator Ans: (b)
a) Rotor Cu loss/rotor input b) Rotor Cu loss/rotor output c) stator Cu loss/stator input d) Rotor Cu loss/stator Cu loss Ans: (a)
a) Varies with power factor b) Varies with load c) Is constant at all loads d) None of these Ans: (c)