WBSEDCL free online test series paper 1
by Esha Upadhyay ·
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Question 1 of 15
1. Question
The maximum value of f(x) = x39×2+24x+5 in the interval [1, 6] is (where number after x denote power like x3 is x cube)
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Question 2 of 15
2. Question
An 8pole, 3phase, 50 Hz induction motor is operating at a speed of 700 rpm. The frequency of the rotor current of the motor in Hz is
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Question 3 of 15
3. Question
The dc current flowing in a circuit is measured by two ammeters, one PMMC and another electrodynamometer type, connected in series. The PMMC meter contains 100 turns in the coil, the flux density in the air gap is 0.2 Wb/m2, and the area of the coil is 80 mm2. The electrodynamometer ammeter has a change in mutual inductance with respect to deflection of 0.5 mH/deg. The spring constants of both the meters are equal. The value of current, at which the deflections of the two meters are same, is (where m2 and mm2 are m sqaure and mm square)
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Question 4 of 15
4. Question
The output of a continuoustime, linear timeinvariant system is denoted by T{x(t)} where x(t) is the input signal. A signal z(t) is called eigensignal of the system T , when T{z(t)} = a y(t), where a is a complex number, in general, and is called an eigenvalue of T. Suppose the impulse response of the system T is real and even. Which of the following statements is TRUE?
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Question 5 of 15
5. Question
The self inductance of the primary winding of a single phase 50Hz transformer is 800mH and that of the secondary winding is 600mH.The mutual inductance between these two winding is 480mH.The secondary winding of this transformer is short circuited and the primary winding is connected to a 50Hz single phase sinusoidal voltage source.The current flowing in both the windings is less than their respective rated current.The resistance of both windings can be neglected.What is the effective inductance (in mH) seen by the source?
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Question 6 of 15
6. Question
The angle between two adjacent asymptotes in a root locus diagram is
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Question 7 of 15
7. Question
For an RLC series circuit in resonance, the following statement is not correct
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Question 8 of 15
8. Question
The meter constant of a singlephase energy meter is 500 rev/kWh. It is found that with a load of 5 kW, it makes 40 revolutions in 50 sec. The percentage error is
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Question 9 of 15
9. Question
The impulse response of a linear system is e to the power t, t > 0.The corresponding transfer function is
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Question 10 of 15
10. Question
(a)Both Statement(I) and Statement(II) are individually true and Statement(I1) is the correct explanation of Statement (I)
(b)Both Statement(I) and Statement(II) are individually true but Statement (II) is not the correct explanation of Statement (I)
(c)Statement(I) is true but Statement (II) is false
(d)Statement(I) is false but Statement (II) is trueStatement (1):
Under steadystate conditions, a pure inductance acts as a short circuit for direct current.
Statement (II):
The potential drop across an inductance is proportional to the rate of change of current.Correct
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Question 11 of 15
11. Question
A 4pole do generator is running at 1500 rpm.The frequency of current in the armature winding is (a)50 Hz (b)150 Hz (c)25 Hz (d)100 Hz
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Question 12 of 15
12. Question
Power transmission lines are transposed to reduce
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Question 13 of 15
13. Question
Virtual ground property of operational amplifier indicates that
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Question 14 of 15
14. Question
For a memory system the cycle time is
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Question 15 of 15
15. Question
The following events will not happen when quantizing noise is decreased in PCM
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