11) In the above question, if the coils are connected in series – opposition, then total inductance is
a) 1 H
b) zero
c) 2 H
d) 4 H
12) If L and R denote inductance and resistance respectively, then dimensions of L/R are
a) M L2 T0
b) M2 L0 T
c) M0 L0 T
d) none of the above
13) Choke coil works on the principle of
a) mutual inductance
b) self-inductance
c) dynamically induced e.m.f.
d) none of the above
14) If time constant of RL series circuit is 40ms, how long does it take to discharge?
a) 80 ms
b) 120 ms
c) 200 ms
d) 160 ms
15) A current through a coil of inductance 5 H is decreasing at the rate of 2 A/sec. The e.m.f. induced in the coil is
a) 2.5 V
b) – 2V
c) -10 V
d) 10 V
16) A coil of radius R has 400 turns and a self-inductance of 32 mH. What will be the inductance of a similar coil of 300 turns?
a) 18 mH
b) 64 mH
C) 8 mH
d) 16 mH
17) If N is the number of turns of the coil, the inductance varies as
a) N0
b) N
c) N-2
d) N2
18) When magnetic flux linking a conductor changes,
a) an e.m.f. is always induced
b) a current is always induced]
c) both e.m.f. and current are always induced
d) neither e.m.f. nor current is inducted
19) The cores in electrical machines are generally made of laminations to reduce
a) hysteresis loss
b) eddy current loss
c) copper loss
d) all above
हम परीक्षा की तैयारी के लिए पिछले वर्ष के प्रश्न पत्र अध्ययन सामग्री पुस्तक बुक करने के लिए यहां हैं।