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Electrical Engineering
Electromagnetic Fields
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Q.1
The unit of capacitance is
henry
ohm
farad
farad/m
Q.2
In a cable capacitor, voltage gradient is maximum at the surface of the
earth
conduction
sheath
insulator
Q.3
Laplacian of a vector is ___________ of gradient of its divergence and its curl of curl.
addition
difference
multiplication
division
Q.4
The dielectric constant (relative permittivity) of glass is given by
0.1 to 0.4
0.5 to 1.0
2.0 to 4.0
5 to 100
Q.5
The sparking between two electrical contacts can be reduced byinserting a
Capacitor in parallel with contacts
Capacitor in series with each contact
Resistance in line
None of the above
Q.6
A capacitance off if is connected in series with a resistance of£The time constant of the circuit is
0.2 s
0.4
0.6 s
0.8 s
Q.7
Is that property of a capacitor which delays any change of voltageacross it.
Inductance
Capacitance
Potential gradient
None of the above
Q.8
The property of a capacitor to store electricity is called its
capacitance
charge
energy
none of the above
Q.9
Dielectric stregth______with increasing thickness
increases
decreases
remains unaltered
none of the above
Q.10
The unit of dielectric strength is given by
V/m
V2/m
m/V
m/V2
Q.11
Electric intensity at any point in an electric field is equal to the at thatpoint.
electric flux
magnetic flux density
potential gradient
none of the above
Q.12
The value of E within the field due to a point charge can be found withthe help of
Faraday's laws
Kirchhoff s laws
Coulomb's laws
none of the above
Q.13
The unit of electric instensity is
N/C2
Wb/m2
N/C
N2/C
Q.14
The number of Faraday tubes of flux passing through a surface in anelectric field is called
electric flux
electric flux density
magnetic flux density
electric charge density
Q.15
A unit tube of flux is known as tube
Newton
Faraday
Michale
None of the above
Q.16
The total deficiency or excess of electrons in a body is known as
current
voltage
potential gradient
charge
Q.17
A single core cable used onV has conductor diametermm and the in¬ternal diameter of sheathmm. The maximum electrostatic stress in the cable is
62 x 105 V/m
72 x 105 V/m
82 x 105 V/m
92 x 105 V/m
Q.18
When the dielectric is homogeneous,the potential gradient is
uniform
non-uniform
zero
any of the above
Q.19
Capacitors are used for audio frequency and radio frequency couplingand tuning.
Air
Mica
Plastic film
Ceramic
Q.20
Capacitors are used in transistor circuits.
Ceramic
Paper
Air
Electrolytic
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