1
COMEDK 2020
MCQ (Single Correct Answer)
+1
-0

A coil of wire of a certain radius has 100 turns and a self inductance of 15 mH. The self inductance of a second similar coil of 500 turns will be

A
75 mH
B
375 mH
C
15 mH
D
None of the above
2
COMEDK 2020
MCQ (Single Correct Answer)
+1
-0

A coil of 100 turns carries a current of 5 mA and creates a magnetic flux of 10$$^{-5}$$ Wb. The inductance is

A
0.2 mH
B
2.0 mH
C
0.02 mH
D
None of these
3
COMEDK 2020
MCQ (Single Correct Answer)
+1
-0

In step-up transformer, relation between number of turns in primary (N$$_P$$) and number of turns in secondary (N$$_S$$) coils is

A
N$$_S$$ is greater than N$$_P$$
B
N$$_P$$ is greater than N$$_S$$
C
N$$_S$$ is equal to N$$_P$$
D
N$$_P$$ = 2N$$_S$$
4
COMEDK 2020
MCQ (Single Correct Answer)
+1
-0

For a series L-C-R circuit at resonance, which statement is not true?

A
Wattless current is zero.
B
Power factor is zero.
C
Peak energy stored by a capacitor = peak energy stored by an inductor.
D
Average power = apparent power.
EXAM MAP