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Electronics and Communication Engineering - Exam Questions Papers

Exercise : Exam Questions Papers - Exam Paper 17
36.
Which of the following statements is not correct for thermistors?
They have negative temperature coefficient of resistance
The sensing element is made of sintered ceramics, which are oxides of metals in the form of beads
The variation of resistance with temperature is linear
The resistance value at ambient temperature may range from 100 Ω to 100 kΩ
Answer: Option
Explanation:
No answer description is available. Let's discuss.
37.
Which one of the following logic families can be operated using a supply voltage from 3 V to 15 V?
TTL
ECL
PMOS
CMOS
Answer: Option
Explanation:
No answer description is available. Let's discuss.
38.
The circuit shown in the figure is used to charge the capacitor C alternately from two current sources as indicated. The switches S1 and S2 are mechanically coupled and connected as follow
For 2nT ≤ t < (2n + 1)T, (n = 0, 1, 2, ...) S1 to P1 and S2 to P2
For (2n + 1) T ≤ t < (2n + 2)T, (n = 0, 1, 2, ...) S1 to Q1 and S2 to Q2
Assume that the capacitor has zero initial charge. Given that u(t) is a unit step function, the voltage Vc(t) across the capacitor is given be
(- 1)n tu(t - nT)
u(t) + 2 (-1)n u(t - nT)
tu(t) + 2 (-1)n (t - nT) u(t - nT)
[0.5 - e-(t - 2nT) + 0.5e-(t - 2nT - T) ]
Answer: Option
Explanation:
No answer description is available. Let's discuss.
39.
Which one of the following is a regulated power supply?
IC 555
IC 844
IC 3080
IC 723
Answer: Option
Explanation:
No answer description is available. Let's discuss.
40.
The input impedance of figure given below is
Rg(1 + Av)
Rg(1 - Av)
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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