Quiz
BSNL TTA ONLINE TEST - 2 Network, Filters and Transmission Lines
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Questions in this quiz (30)
1Proximity effect depends on
- Afrequency
- Bdistance between the conductors
- Crelative permeability
- Dall of the above
2Skin effective is more in case of
- Acommunication lines
- Bpower lines
- Csame in both cases
- Dnone of the above
3Apart from the skin effect the non uniformity of the current distribution is also caused by
- Abundled conductors
- Bferranti effect
- Cproximity effect
- Dall of the above
4Transmission lines are transposed to reduce
- Ainterference with neighbouring communication lines
- Bferranti effect
- Cproximity effect
- Dskin effect
5In transmission lines distribution constants are
- Ainductance and capacitance
- Bresistance
- Cinductance and resistance
- Dboth 1 and 2
6Aluminium is now most commonly employed conductor material in transmission lines than copper because
- Ait is more conductive
- Bits tensile strength is more
- Ccostlier
- Dit is cheaper and lighter
7ACSR means
- AAluminium core steel reinforced
- BAluminium conductor steel reinforced
- CAluminium copper steel reinforced
- Dall conductor steel reinforced
8The inductance of single phase two wire line is given by
- A4*10-7* ln(d/r') H/m
- B4*10-7* ln(r'/d) H/m
- C0.4*10-7* ln(d/r') H/m
- D0.4*10-7* ln(r'/d) H/m
9If the diameter of the conductor is increased
- Athe inductance is increased
- Bthe inductance is decreased
- Cthe resistance is increased
- Dno change in inductance and resistance
10Which of the following statements is/are true
- AVoltage regulation for short transmission line
= (Vs - Vr) / Vr - BVoltage regulation for medium transmission line
= (Vs - Vr) / Vr - CVoltage regulation for long transmission line
= (Vs - Vr) / Vr - Dall of the above
- AVoltage regulation for short transmission line
11The ABCD constants of a 3-phase transmission line are
A = D = 0.8∠1°, B = 170∠85° Ω , C = 0.002∠90.4° ℧.
The sending end voltage is 400 kV. The receiving end voltage under no load condition is- A400 kV
- B500 kV
- C600 kV
- D350 kV
12Surge impedance loading of a 3-phase, 400 kV transmission line is 400 Ω. The surge impedance loading is
- A400 MW
- B800 MW
- C1600 MW
- D200 MW
13Surge impedance loading of a transmission line can be increased by
- Aincreasing its voltage level
- Baddition of lumped inductance in parallel
- Caddition of lumped capacitance in series
- Dboth 1 and 3
14For transmission line which one of the following relation is true?
- AAD - BC = 0
- BAD + BC = 0
- CAD - BC = 1
- DAD - BC = -1
15A 3-phase transmission line has its conductors at the corners of an equilateral triangle with side 3m. The diameter of each conductor is 1.63 cm. The inductance of the line per phase per km is
- A1.093 mH
- B1.043 mH
- C1.182 mH
- D1.232 mH
16In series RLC circuit which of the following represents the Q factor ?
- AXC/R
- BVR/V
- CXL/R
- DAll of the above
17In series RLC circuit what is the power factor just bellow the resonance frequency?
- ALagging
- BLeading
- CUnity
- DZero
18Which of the following represents the resonance frequency (ω0) with respect to lower cutoff frequency (ω1) and higher cutoff frequency (ω2)
- Aω1 + ω2
- Bω1 - ω2
- Cω1 / ω2
- D√(ω1² + ω2²)
19In a series resonance circuit if bandwidth is 1 MHz and inductance is 1 mH, then what is the resistance value?
- A1 KΩ
- B1 MΩ
- C1 Ω
- D100 Ω
20Time constant of RL series circuit is
- A2L/R
- BRC
- CL/R
- D2RC
21Time constant is the time taken for response to rise -------of maximum value?
- A63.2%
- B100%
- C90%
- D68.3%
22 In which of the following oscillations are not present?
- AUnder damping
- BOver damping
- CCritical damping
- DBoth 2 and 3
23In RLC series circuit R=2Ω, L=2mH and C=1μF and applied voltage is 10V dc. Then what is steady state current value?
- A5A
- B2A
- C1A
- D0A
24Image impedance can be written by using short circuit impedance(Zsc)and open circuit impedance(Zoc) as
- AZsc+Zoc
- BZsc-Zoc
- CZsc/Zoc
- D(Zsc . Zoc)½
25Poles and zeros are arranged alternatively on imaginary axis, then type of network is?
- ARLC network
- BLC network
- CRC network
- DRL network
26In ideal system coefficient of coupling(k) is
- A0
- B1
- C∞
- D1 & ∞ Both
27Basic cut set matrix consists of
- Aone branch
- Bno branches
- C2 branch
- Dany number of branches
28Active filter consists of
- ACapacitor
- BInductor
- Cop-amp and capacitor
- Dop-amp
29Reciprocity condition for h parameters is
- Ah12 = h21
- Bh12 = -h21
- Ch11h22 - h21h12 = 0
- Dh11 = h22
30A pole of driving point impedance is
- AZero current for a finite value of driving voltage
- BZero voltage for a finite value of driving current
- CZero voltage for a finite value of driving voltage
- DZero current for a finite value of driving current
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- Subject : Network, Filters and Transmission Lines Instruction: Time limit for the exam: 25 Minutes Total number of questions : 30 Q Each question carry 1 mark, no negative marks. DO NOT refresh the page. All the best by BSNL ACADEMY If U Like Our Test series than Share with your friends and Rate Our Tests.
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