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Question 1 of 15
1. Question
With initial condition x(1) = 0.5 , the solution of the differential equation t(dx/dt) + x = t is
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Question 2 of 15
2. Question
Given a system of equations:
x+2y+2z = b1
5x+y+3z = b2
Which of the following is true regarding its solutionsCorrect
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Question 3 of 15
3. Question
An incandescent lamp is marked 40 W, 240V. If resistance at room temperature (26°C) is 120 Ω, and temperature coefficient of resistance is .0045/°C, then its ‘ON’ state filament temperature in °C is approximately
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Question 4 of 15
4. Question
Consider a system consisting of a synchronous generator working at a lagging power factor, a synchronous motor working at an overexcited condition and a directly gridconnected induction generator. Consider capacitive VAr to be a source and inductive VAr to be a sink of reactive power. Which one of the following statements is TRUE?
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Question 5 of 15
5. Question
A dc voltage with ripple is given by v(t) = [100 + 10 sin(wt) − 5 sin (3wt)] volts. Measurements of this voltage v(t), made by movingcoil and movingiron voltmeters, show readings of V1 and V2 respectively. The value of V2 − V1, in volts, is
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Question 6 of 15
6. Question
A signal of 10 V is applied to a 50
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Question 7 of 15
7. Question
The electric field in the vicinity of two oppositely charged parallel conductors is
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Question 8 of 15
8. Question
For a series and a parallel circuit,the equivalent total value of certain parameter X is given by
Xe = X1 + X2+X3 +X4 +___+X1
where X; is the ith value of the parameter and Xe is the equivalent value, and n is the number of elements. The parameter X can be
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Question 9 of 15
9. Question
A coil having 250 turns is connected to a 50 V DC source.If the coil resistance is 10Ω, the m.m.f. (magnetomotive force) developed in AT would be
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Question 10 of 15
10. Question
The following is not essential for the working of an indicating instrument
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Question 11 of 15
11. Question
Systematic error of an instrument for measurement can be minimized by
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Question 12 of 15
12. Question
Guard circuits are used in insulation resistance measurements to
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Question 13 of 15
13. Question
The following transfer function represents a phaselead compensator
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Question 14 of 15
14. Question
Consider the following statements :The opencircuit test in a transformer can be used to obtain
1.Core losses.
2.Magnitude of exciting current.
3.Copper losses.
4.Equivalent series impedance.Correct. statements are
(a)1,2, 3 and 4
(b)1 and 3 only
(c)1 and 2 only
(d)2 and 4 onlyCorrect
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Question 15 of 15
15. Question
The rotor frequency of a 3phase,5kW,400V,50Hz,4pole slip ring induction motor is 25Hz.The speed of the motor when connected to a 400 volt,50 Hz supply will be
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Leaderboard: KPTCL 5
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