⚡Electrical Engineering MCQs
Electrical Engineering MCQs
499 MCQs461
If a charged rod is brought closer to a gas filled balloon then______________?
ARadius decreases
BBalloon bursts
CRadius increase
DBalloon squeezes
462
If metallic conductor is charged negatively then its weight______________?
ARemains same
BFirst increases then decreases
CDecreases then increases
DIncreases for a while
463
If two charges are increased by two times then force_____________?
ADecreases 9 times
BIncreases 9 times
CIncreases 4 times
DDecreases 4 times
464
When we rub a glass rod with a silk cloth then________________?
Aglass rod acquires negative charge while silk acquires positive charge
Bglass rod acquires positive charge while silk acquires negative charges
Cboth glass rod and silk acquire negative charge
Dboth glass rod and silk acquire positive charge
465
A coil of wire is arranged with its plane perpendicular to a uniform magnetic field o flux density B. when the radius of the coil increases from r1 to r2 in time Δt then what is the emf induced in the coil ?
AωB/r22-r12/Δt
BωB(r2-r1)2/Δt
CωB(r22-r12)/Δt
DωB(r22+r12)/Δt
466
Self-inductance of a long solenoid is______________?
AμoN2A
BμoN2/A
CμoN2
DBA
467
The alternating current has frequency of 106 Hz in such a way that time period for completion of cycle is_______________?
A1Hzs
B1.5Hzs
C106sec
D1sec
468
Self inductance of a coil depends upon________________?
Acurrent flowing
Bnumber of turns per unit length
Cvoltage produce
Dall
469
Energy stored in a magnetic field is given by______________?
ALI2
BL2I/2
CLI2/2
DIL2
470
For electroplating we use_________________?
AC source
Ban
Cany source
Dall of the above