Industrial Electronics

41. The step response of a first order systems is given by

1. y(t) = A₀
2. y(t) = A₀ + A₁e^s1t + A₂e^s2t +A₃e^s3t
3. y(t) = A₀ + A₁e^s1t + A₂e^s2t
4. y(t) = A₀ + A₁e^s1t

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42. The supply voltage is generally _________ that of breakover voltage in an SCR.

1. equal to
2. less than
3. greater than
4. twice

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43. The three terminals of a triac are

1. drain, source, gate
2. two main terminals and a gate terminal
3. cathode, anode and gate
4. anode, source, gate

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44. The three terminals of an SCR are the

1. anode, cathode, and grid
2. cathode, anode, gate
3. anode, cathode, drain
4. drain, source, gate

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45. The triac is fundamentally a/an _________ with a gate terminal for controlling the turn-on conditions of the bilateral device in either direction.

1. SCR
2. Quadric
3. Shockley diode
4. Diac

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46. The typical turn-off time of an SCR is about

1. 20 to 40 μs
2. 5 to 40 μs
3. 1 to 5 μs
4. 15 to 25 μs

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47. The UJT has

1. two pn junctions
2. three pn junctions
3. one pn junction
4. four on junction

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48. The UJT may be used as

1. an amplifier
2. a rectifier
3. a sawtooth generator
4. a multivibrator

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49. The UJT operates in what region after peak point?

1. Cut off
2. Negative resistance
3. Saturation
4. Positive resistance

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50. The V-I characteristics for a triac in the first and third quadrants are essentially identical to those of _________ in the quotation.

1. SCR
2. UJT
3. Transistor
4. SCS

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