83)Applying Kirchhoff current law to Junction ‘C’ the value of Y -X = ………. Ampere.
A) 20
B) 10
C) 8
D) 0
View Answer
C) 8
Explanation:8A + 6A + XA = 4A + 2A + YA
14 + X = 6 + Y
Y-X=14-6 = 8A
84)Within the solenoid magnetic lines of forces ……………………..
A) Pass from South pole to North pole
B) Pass from North pole to South pole
C) North to South and South to North
D) Does not pass
View Answer
A) Pass from South pole to North pole
85)When a current passes through a straight conductor, magnetic field surrounding conductor will be…………….
A) straight lines
B) parabola
C) closed circles
D) hyperbola
View Answer
C) closed circles
86)If a charge ‘q’ having mass ”m” moves Perpendicular to magnetic induction field ‘B’ with velocity ‘v’ then, the radius of circular path of moving charge……………………
A) mv/ Bq
B) Bq / mv
C) mvBq
D) 0
View Answer
A) mv/ Bq
87)In electric motor, current direction in coil is changed by ………………….
A) Two magnets
B) Two slip rings
C) One Brush one slip ring
D) None
View Answer
B) Two slip rings
88)When a current carrying straight conductor of length 2 m, moves perpendicular to magnetic induction field strength of 2 Tesla with velocity 10 m/ s, find e.m.f., induced in volts.
A) 4000
B) 1000
C) 400
D) 40
View Answer
D) 40
Explanation:EMF = B/V
EMF = 2×2 X 10 = 40V
89)Security Checking Alarm works on which principle?
A) Newton
B) Lenz
C) Electromagnetic induction
D) Ohm
View Answer
C) Electromagnetic induction
90)An A.C. generator is provided with …………… slip rings.
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