Q .
In liquids charge carriers are electrons only.
A. True
B. False
C.
D.
E. NA
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Q .
The colour code of a carbon resistance is yellow-violet-orange silver. The value of resistance is
A. 57000 Ω ± 5%
B. 47000 Ω ± 10%
C. 47000 Ω ± 5%
D. 57000 Ω ± 5%
E. NA
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Q .
The ability of a radio receiver to discriminate between different input signals and to accept only one definite signal is called its
A. sensitivity
B. attenuation
C. selectivity
D. modulation
E. NA
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Q .
Two coils having equal resistance but different inductances are connected in series. The time constant of the series combination is
A. average of the time constants of individual coils
B. sum of the time constants of the individual coils
C. geometric mean of the time constants of individual coils
D. product of the time constants of the individual coils
E. NA
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Q . Assertion (A): A band elimination filter attenuates signals whose frequencies lie between the cutoff frequencies.
Reason (R): A band elimination circuit is very different from band pass circuit.
A. Both A and R are true and R is correct explanation of A
B. Both A and R are true and R is not the correct explanation of A
C. A is true but R is false
D. A is false but R is true
E. NA
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Q .
The unit of permeability is
A. T
B. Wb
C. H/M
D. H
E. NA
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Q .
In an ac circuit that delivers constant power at varying p.f., the current is
A. lowest when p.f. is leading
B. lowest when p.f. is lagging
C. lowest when p.f is unity
D. the same for all power factors
E. NA
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Q .
The relation AD - BC = 1 where A, B, C, D are transmission parameters of a network is valid for
A. every network
B. passive but not reciprocal network
C. passive and reciprocal network
D. both active and passive networks
E. NA
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Q .
Electric shock is
A. always fatal
B. never fatal
C. sometimes fatal
D. always disfiguring
E. NA
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Q .
The series element in band pass filter is
A. capacitive
B. inductive
C. parallel combination of inductance and capacitance
D. series combination of inductance and capacitance
E. NA
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Q .
The resistance of the aluminium conductor (r = 2.83 x 10-8 Ωm) in figure is
A. 0.001 Ω
B. less than 0.001 Ω
C. more than 0.001 Ω
D. more than 0.002 Ω
E. NA
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Q .
Kirchoff's laws are applicable to
A. steady state conditions only
B. transient conditions only
C. both steady state and transient condition
D. both steady state and transient condition but with some constraints
E. NA
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Q .
An ideal current source has
A. infinite source resistance
B. zero source resistance
C. large value of source resistance
D. finite value of source resistance
E. NA
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Q . Assertion (A): In drawing an electric circuit analogous to a mechanical circuit, spring is replaced by capacitance.
Reason (R): The behaviour of a spring and capacitor are similar.
A. Both A and R are true and R is correct explanation of A
B. Both A and R are true and R is not the correct explanation of A
C. A is true but R is false
D. A is false but R is true
E. NA
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Q .
For an RC admittance function
A. all poles and zeros are simple
B. all poles and zeros are simple and lie on negative real axis
C. all poles and zeros lie on imaginary axis
D. all poles and zeros lie on positive real axis
E. NA
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Q .
The polynomial P (s) = (s - 1) (s2 + 1) (s + 2) (s + 3) is
A. Hurwitz but not strictly Hurwitz
B. not Hurwitz
C. strictly Hurwitz
D. anti/Hurwitz
E. NA
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Q .
The flux linkage ψ, self inductance L and current i are related as
A. ψ = L/i
B. ψ = Li
C. ψ = Li2
D.
E. NA
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Q .
A network N is dual of network N if
A. both of them have same mesh equation
B. both of them have same node equation
C. mesh equation of one are the node equations of the other
D. KCL and KVL equations are the same
E. NA
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Q .
For an RC admittance function
A. the lowest critical frequency is a zero
B. the highest critical frequency is a pole
C. the lowest critical frequency is zero and the highest critical frequency is a pole
D. the lowest critical frequency is a pole
E. NA
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Q .
A coil is connected across a 200 V, 50 Hz supply and takes a current of 10 A. The loss in the coil is 1000 W. The impedance and resistance of the coil are
A. 10 Ω, 8 Ω
B. 15 Ω, 8 Ω
C. 20 Ω, 10 Ω
D. 30 Ω, 15 Ω
E. NA
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Q .
In a Hurwitz polynomial
A. all coefficients are non-negative
B. the coefficients may be positive or negative
C. all coefficients are negative
D. all coefficients are non-negative and all zeros should be either in left half plane or simple on the imaginary axis
E. NA
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Q .
In figure, the ratio V(s)/I(s) is
A. R
B. R + sL
C.
D.
E. NA
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Q .
An RLC series circuit is excited by a step voltage E. The circuit current at t = 0 is
A. E/R
B. E/LC
C. zero
D. infinity
E. NA
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Q .
The following table gives some Laplace transforms and the functionsf(t) F(s)1.δ(t) s2. u(t) 1/s3. tu(t) 2/s24. t2u(t) 2s3Of these the correctly matched pairs are
A. 2 and 4
B. 1 and 4
C. 2 and 4
D. 1 and 2
E. NA
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Q .
If resistance is 20 Ω and inductance is 2 H in a R-L series circuit, then time constant of this will be
A. 0.001 s
B. 0.1 s
C. 10 s
D. 100 s
E. NA
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Q .
For representing two sinusoidal voltages on a phasor diagram
A. Both voltages must be of the same frequency
B. Both voltages must be sinusoidal but may be of different frequencies
C. One of the voltages must be of 50 Hz
D. The frequency of one must be integral of that of other
E. NA
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Q .
Choose the correct option Transit period is the time between two steady stateTransient Response is the response due to internal energy stored in circuitTransit response is also called natural responseTransit response arises due to presence of C and L in the circuitTransit is due to R, L, C in the circuit
A. 4, 3, 2 , 1
B. 5, 4, 3, 2
C. 5, 4, 3, 1
D. 5, 1, 4
E. NA
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Q .
What are the ABCD parameters of the single elements circuit given below?
A.
B.
C.
D.
E. NA
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Q .
The graph of a network is shown in the figure. Which one of the figure shown is not a tree of the graph?
A.
B.
C.
D.
E. NA
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Q .
In a pure capacitive circuit if the supply frequency is reduced to 1/2, the current will
A. be reduced by half
B. be doubled
C. be four times as high
D. be reduced to one fourth
E. NA
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Q .
The circuit shown in figure is a
A. low pass filter
B. high pass filter
C. band pass filter
D. band stop filter
E. NA
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Q .
If Ia, Ib, Ic are line currents and Ia0 is the zero sequences component of Ia then
A. Ia0 = Ia
B. Ia0 = Ia + Ib + Ic
C.
D.
E. NA
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Q .
The first critical frequency nearest the origin of the complex frequency plane for an RL driving point impedance will be
A. a zero in left half plane
B. a zero in right half plane
C. a pole in left half plane
D. a pole or zero in left half plane
E. NA
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Q .
If current is less than 20 mA and time of contact is very small, the effect of current on human body is likely to be temporary.
A. True
B. False
C.
D.
E. NA
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Q .
Consider the following: Energy storage capability of basic passive elements is due to the fact thatresistance dissipates energycapacitance stores energyinductance dissipates energy Which of the above is/are correct?
A. 1, 2, and 3
B. 1 and 3
C. 3 only
D. 1 and 2
E. NA
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Q .
The poles and zeros of a positive real functions are real or occur in conjugate pair.
A. True
B. False
C.
D.
E. NA
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Q .
The parameter A of a two port network is equal to
A. V2/V1 with I1 = 0
B. V1/I2 with V2 = 0
C. I1/I2 with V2 = 0
D. V1/V2 with I2 = 0
E. NA
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Q .
The Laplace transform of a function f(t) u(t) is __________ where f(t) is periodic with period T, and y(S) times the L.T. of f(t) for first period. Then
A. s
B.
C. eTs
D.
E. NA
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Q .
Two coupled coils lie in parallel planes such that 50% of magnetic flux produced by one links the other. The coefficient of coupling is
A. 0.5
B. 0.25
C. 0.125
D. 0.5
E. NA
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Q .
A dielectric should have poor heat conductivity.
A. True
B. False
C.
D.
E. NA
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Q .
A sinusoidal current having peak value of 7.07 A is superimposed on dc of 5A. If a hot-wire ammeter is used to measure the combined current in the circuit, it will indicate __________ ampere.
A. 7.07
B. 10
C. 12.07
D. 2.07
E. NA
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Q .
In figure the phase plot
A. will be 90° at ω = 0 and 0° at ω = ∞
B. will be 0° at ω = 0 and 90° at ω = ∞
C. will be 45° at ω = 0 and 0° at ω = ∞
D. will be 45° at ω = 0 and 90° at ω = ∞
E. NA
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Q . Assertion (A): A graph can have many trees.
Reason (R): The number of tree branches is equal to number of nodes.
A. Both A and R are true and R is correct explanation of A
B. Both A and R are true and R is not the correct explanation of A
C. A is true but R is false
D. A is false but R is true
E. NA
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Q .
If a resistance R of 1 Ω is connected between A and B in figure, current flowing through R is
A. 1 A
B. 0.5 A
C. 0.25 A
D. 0.125 A
E. NA
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Q .
In solid dielectrics the rate of deterioration doubles for every 10-12°C rise in temperature.
A. True
B. False
C.
D.
E. NA
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Q .
While using Maxwell bridge, the Q factor of a coil is obtained as
A. 1/ωCR
B. ωCR
C. ωC/R
D. R/ωC
E. NA
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Q .
The current I flowing in the branch is
A. -12 A
B. 12 A
C. 3 A
D. -3 A
E. NA
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Q .
In series as well as parallel resonant circuits, increasing the value of resistance would lead to
A. decrease in bandwidth of both the circuits
B. increase in bandwidth of both the circuits
C. decrease in bandwidth in series circuit and increase in parallel circuit
D. increase in bandwidth in series circuit and decrease in parallel circuit
E. NA
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Q .
For a reactance function H(s)
A. Re [H(jω)] is positive for ω ≥ 0
B. Re [H(jω)] is zero for ω ≥ 0
C. Re [H(jω)] is positive or zero for ω ≥ 0
D. Re [H(jω)] is zero or negative for ω ≥ 0
E. NA