Electricity and Magnetic Fundamentals

141. The conduction of electricity across the surface of a dielectric is called

1. creepage
2. skin effect
3. surface effect
4. crosstalk

View answer

142. The contribution to the ionization in an ionization chamber by electrons liberated from the walls.

1. Skin effect
2. Walt effect
3. Hall effect
4. Edison effect

View answer

143. The core of a magnetic equipment uses a magnetic material with

1. Least permeability
2. Low permeability
3. Moderate permeability
4. High permeability

View answer

144. The core of a transformer heats up when its primary is fed from an ac source because of

1. permeability
2. ferromagnetism
3. reluctance of core
4. hysteresis loss

View answer

145. The current of electric circuit is analogous to which quantity of a magnetic circuit

1. Mmf
2. Flux
3. Flux density
4. Reluctivity

View answer

146. The customary energy unit in atomic and nuclear physics is

1. Joule
2. Volt- coulomb
3. electron-volt
4. Walt- second

View answer

147. The diameter of a hydrogen atom is approximately _________ cm.

1. 1.1 x 10∧-6
2. 1.1 x 10∧-7
3. 1.1 x 1O∧-8
4. 1.1 x 10∧-9

View answer

148. The dielectric constant of most materials lies between

1. 1 and 1O
2. 10 and 20
3. 20 and 50
4. 50 and 100

View answer

149. The direction of force o a current carrying conductor placed in a magnetic field can be found by

1. Cork screw rule
2. Fleming's left hand rule
3. Fleming's right hand rule
4. using a compass

View answer

150. The electric field intensity between the parallel plate air capacitor is 20 N/C. If an insulating slab of relative permittivity 5 is placed between the plates, then electric field intensity will be

1. 20 N/C
2. 100 N/C
3. 4 N/C
4. 40 N/C

View answer