1. sinx + sin2x
2. 1 -cos2x
3. sin2x + cos2x
4. 0.5-0.5cos2x
0.5-0.5cos2x
1. (-1)k δ(k)
2. δ(k)-(-1)k
3. (-1)k u(k)
4. u(k)-(-1)k
δ(k)-(-1)k
1. o in c1, no emf in c2
2. ® in c1, no emf in c2
3. o in c2, no emf in c1
4. ® in c2, no emf in c1
® in c1, no emf in c2
1. 25 kW in (i) and 75 kW in (ii)
2. 25 kW in (i) and 50 kW in (ii)
3. 50 kW in (i) and 75 kW in (ii)
4. 50 kW in (i) and 50 kW in (ii)
25 kW in (i) and 50 kW in (ii)
1. In salient pole machines,the direct-axis synchronous reactance is greater than the quadrature-axis synchronous reactance
2. The damper bars help the synchronous motor self-start
3. Short circuit ratio is the ratio of the field current required to produce the rated voltage on open circuit to the rated armature current
4. The V-curve of a synchronous motor represents the variation in the armature current with field excitation,at a given output power
Short circuit ratio is the ratio of the field current required to produce the rated voltage on open circuit to the rated armature current
1. the speed decreases and the stator current increases
2. both the speed and the stator current decrease
3. the speed and the stator current remain practically constant
4. there is negligible change in the speed but the stator current decreases
both the speed and the stator current decrease
1. 0.24
2. 1.44
3. 2.40
4. 6.00
1.44
1. low starting torque
2. quick acceleration
3. high efficiency
4. reduced size
quick acceleration
1. Both [a] and [r] are true and [r] is the correct reason for [a]
2. Both [a] and [r] are true but [r] is not the correct reason for [a]
3. Both [a] and [r] are false
4. [a] is true but [r] is false
Both [a] and [r] are true and [r] is the correct reason for [a]
1. 0.3,0.2
2. 0.5,0.2
3. 0.5,0.6
4. 0.3, 0.6
0.3, 0.6