TANCET2008(Q11toQ20)

TANCET (Questions from Question Paper for Year 2008)


11. Q factor of a Series RLC circuit with R = 10 Ω, L=25mH, C=100 µF
A) 0.0395                    
B) 100.71
C) 1.58                       
D) 1.58 x10^-3

12. Reactive power of a balanced delta connected load fed from 3-phase 400 V system, the phase current is 20A. and power factor angle 40^o lagging is
A) 13.856x10³ VARs
B) 15.43 x10^-3 VARs
C) 18.385X 10^-3 VARs
D) 24x10^-3 VARs

13. A transformer operates most efficiently a 3/4th full load. Its Iron loss (P_i) and full-load copper loss (P_c) are related as
A) (P_i/P_c)=(16/9)
B) (P_i/P_c)=(3/4)
C) (P_i/P_c)=(4/3)
D) (P_i/P_c)=(9/16)

14. A synchronous generator is feeding power to infinite bus-bars at unity power factor. Its
excitation is now Increased, It will deliver
A) The same power, but at a leading power factor
B) The same power, but at a lagging power factor
C) More power at unify power factor
D) Lesser power at unity power factor

15. In star-delta starting of a Squirrel-cage inductor motor, compared to direct on-line starting, the starting current and torque are reduced by the factors
A) 1/3,1/3
B) 1/√3, 1/3
C) 1/√3,1/√3
D) 1/3, 1/√3 respectively

16. The voltages of a generator and an Infinite bus are given as 0.92 10° and 1.0 0° respectively. The active power will flow from
A) No power flow
B) Generator to infinite bus
C) Infinite bus to generator
D) None of the above

17. The p.u. impedance value of an alternator corresponding to base values of 13.2 kV and
30 MVA is 0.2 per unit. The per unit value of Impedance with respect to the new base values
of 13.8 kV and 50 MVA will be
A) 0.328 p.u.               
B) 0.330 p.u.
C) 0.318 p.u.               
D) 0.305 p.u.

18. Steady State error of type-l system for unit step Input is
A) 1/kv
B) ∞
C) 0
D) 1/(1+kp)

19. The following system

A) Completely observable
B) Not completely observable
C) Not completely controllable
D) None of the above

20. I separately excited dc motor when fed single phase full converter runs at a speed of 1200 rpm. Load current remains continuous. If one of the SCRs gets open circuited, the motor speed wilt reduce to
A) 900 rpm
B) 800 rpm
C) 600 rpm
D) 400 rpm

Answer: 11-C; 12-A; 13-D; 14-C; 15-B; 16-B; 17-C; 18-A; 19-C; 20-A.