SSC JE Electrical 2019 with solution SET-1 The below symbol which is used in single line diagrams represents Power transformer Current transformer Circuit breaker Potential transformer Power transformer Current transformer Circuit breaker Potential transformer ANSWER DOWNLOAD EXAMIANS APP
SSC JE Electrical 2019 with solution SET-1 An electric motor in which both the rotor and stator fields rotate with the same speed is called DC motor Induction motor Universal motor Synchronous motor DC motor Induction motor Universal motor Synchronous motor ANSWER EXPLANATION DOWNLOAD EXAMIANS APP In the synchronous motor, the stator and rotor rotate at the same speed.
SSC JE Electrical 2019 with solution SET-1 Two coupled coils with L1 = L2 = 0.5H have a coupling coefficient of K = 0.75. The turn ratio N1 ⁄ N2 = ? 1 4 0.5 2 1 4 0.5 2 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP The self-inductance is given asL = μN2A/IL ∝ N2whereN is the number of turns of the solenoidA is the area of each turn of the coill is the length of the solenoidand μ is the permeability constantL1/L2 = N21/N220.5/0.5 = N21/N22N1/N2 = 1
SSC JE Electrical 2019 with solution SET-1 Identify the important feature of a DC series motor Medium starting torque High starting torque Zero starting torque Low starting torque Medium starting torque High starting torque Zero starting torque Low starting torque ANSWER EXPLANATION DOWNLOAD EXAMIANS APP In DC series motor Torque (Ta) increase as the Square of armature current (Ia) Ta ∝ Ia2. So DC motor provides high starting torque.
SSC JE Electrical 2019 with solution SET-1 When the supply to the excitation fails, the synchronous generator acts like a/an Synchronous generator Synchronous motor Induction motor Induction generator Synchronous generator Synchronous motor Induction motor Induction generator ANSWER DOWNLOAD EXAMIANS APP
SSC JE Electrical 2019 with solution SET-1 A synchronous motor runs at 600rpm, which of the following case is true? P = 8, f = 50 Hz P = 10, f = 60 Hz P= 12, f = 50 Hz P = 12, f = 60 Hz P = 8, f = 50 Hz P = 10, f = 60 Hz P= 12, f = 50 Hz P = 12, f = 60 Hz ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Synchronous speed NS = 120f/PWhenP = 12 & F = 60 then Ns = ?NS = 120f/P = (120 × 60)/12 = 600 RPM
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