17- The electromechanical breakdown depend on the type of the dielectric between two electrodes a Right. b- Wrong
17- The electromechanical breakdown depend on the type of the dielectric between two electrodes a Right. b- Wrong
Delmar's Standard Textbook Of Electricity
7th Edition
ISBN:9781337900348
Author:Stephen L. Herman
Publisher:Stephen L. Herman
Chapter7: Parallel Circuits
Section: Chapter Questions
Problem 4PP: Using the rules for parallel circuits and Ohmslaw, solve for the missing values....
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![17- The electromechanical breakdown depend on the type of the dielectric between
two electrodes
a- Right.
b- Wrong
18- Basic Insulation Level (BIL) is related to the design consideration of the electric
device, while Basic protection (BPL) level is related to protection level of the that
device.
a Right.
Wrong.
b-
19- As the voltage regulation increased, receiving end voltage will be reduced.
Right.
b- Wrong
20- We can be using Solar power generation field as a power factor and voltage profile
enhancement in Distribution system.
(aRight.
b- Wrong.
21- From the general electrostatic theories, the field strength at breakdown is given by:
a Eb = V/ do =0.6 [Y/ (€ o Er) ] 0.5.
b- Eb V/ do = 0.6 [Y / (€ 0/Er )] 0.5.
C- Eb V/ do = 0.6 [ Y/(Eo Er) 20.05.
d- Eb V/ do = 0.6 [ Y/ (Eo Er) 10.5.
22- Consider plane electrodes with a solid insulator between them. Find the electric
field strength at breakdown, if Young's modulus = 10000 (V.F/m2). and the relative
permittivity is (36000 TT). If the distance between these electrodes is (1 Cm ), find
the breakdown voltage at that field
a- Eb = 600kv / m, V = 60kv.
b- ) all these answers are wrong.
) Eb = 6000kv / m, V= 60kv.
d- Eb = 60kv/m, V = 600V.
23- 1- The greater power transmission with d.c. over a.c. is given by the ratio of powers
a Pd/Pa 2/cos 1.414 at p. = unity and 1.768 at pf 0.8.
b- Pd/ Pa = 12/cos 1.141 at pf unity and 1.786 at pf = 0.9.
C- Pd/Pa V3/cos 1.414 at pf unity and 1.768 at pf 0.9.
d- Pd/Pa =V2/cos = 1.114 at pf = unity and 1.768 at pf = 0.8.
24- The expression for fair weather corona loss per phase is.
a- 380 /8 (f+ 25) Vr/d (V- VO) 2 10-5 kw / km / ph b.
b- 390/8(f+25 ) Vr/d (V+V0) 2 10-5 kw/ mile / ph.
390/8(f+ 25 ) Vr /d (V-VO)2 10-5 kw/mile/ph.
d- 390/8(f+25) Vr/VO) -2 10-5 kw/mile/ph
25- Short HVTL with a sending end voltage of 1.05 p.u, and receiving end voltage of 1
p.u, and line impedance of 0.5 p.u, what are the Maximum and ? allowable power
transfer on this line
a- 2.05 p.u, 1.5 p.u.
b2.1 p.u, 1.05 p.u.
C- 2.15 p.u, 1.55 p.u.
d- 2.05 p.u, 1.55 p.u.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fe0db74f7-0e9a-46b6-826b-8a51f9ef5bcd%2Feda37b81-32bc-42e8-9624-343028fe1e9b%2Fk4zn71_processed.jpeg&w=3840&q=75)
Transcribed Image Text:17- The electromechanical breakdown depend on the type of the dielectric between
two electrodes
a- Right.
b- Wrong
18- Basic Insulation Level (BIL) is related to the design consideration of the electric
device, while Basic protection (BPL) level is related to protection level of the that
device.
a Right.
Wrong.
b-
19- As the voltage regulation increased, receiving end voltage will be reduced.
Right.
b- Wrong
20- We can be using Solar power generation field as a power factor and voltage profile
enhancement in Distribution system.
(aRight.
b- Wrong.
21- From the general electrostatic theories, the field strength at breakdown is given by:
a Eb = V/ do =0.6 [Y/ (€ o Er) ] 0.5.
b- Eb V/ do = 0.6 [Y / (€ 0/Er )] 0.5.
C- Eb V/ do = 0.6 [ Y/(Eo Er) 20.05.
d- Eb V/ do = 0.6 [ Y/ (Eo Er) 10.5.
22- Consider plane electrodes with a solid insulator between them. Find the electric
field strength at breakdown, if Young's modulus = 10000 (V.F/m2). and the relative
permittivity is (36000 TT). If the distance between these electrodes is (1 Cm ), find
the breakdown voltage at that field
a- Eb = 600kv / m, V = 60kv.
b- ) all these answers are wrong.
) Eb = 6000kv / m, V= 60kv.
d- Eb = 60kv/m, V = 600V.
23- 1- The greater power transmission with d.c. over a.c. is given by the ratio of powers
a Pd/Pa 2/cos 1.414 at p. = unity and 1.768 at pf 0.8.
b- Pd/ Pa = 12/cos 1.141 at pf unity and 1.786 at pf = 0.9.
C- Pd/Pa V3/cos 1.414 at pf unity and 1.768 at pf 0.9.
d- Pd/Pa =V2/cos = 1.114 at pf = unity and 1.768 at pf = 0.8.
24- The expression for fair weather corona loss per phase is.
a- 380 /8 (f+ 25) Vr/d (V- VO) 2 10-5 kw / km / ph b.
b- 390/8(f+25 ) Vr/d (V+V0) 2 10-5 kw/ mile / ph.
390/8(f+ 25 ) Vr /d (V-VO)2 10-5 kw/mile/ph.
d- 390/8(f+25) Vr/VO) -2 10-5 kw/mile/ph
25- Short HVTL with a sending end voltage of 1.05 p.u, and receiving end voltage of 1
p.u, and line impedance of 0.5 p.u, what are the Maximum and ? allowable power
transfer on this line
a- 2.05 p.u, 1.5 p.u.
b2.1 p.u, 1.05 p.u.
C- 2.15 p.u, 1.55 p.u.
d- 2.05 p.u, 1.55 p.u.
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