A temperature in the range of −40˚ C to 55˚ C is to be measured with a resolution of 0.1˚ C. The
minimum number of ADC bits required to get a matching dynamic range of the temperature sensor

**A. ** 8

**B. ** 10

**C. ** 12

**D. ** 14

**Answer : ****Option B**

**Explaination / Solution: **

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A 2-bit flash Analog to Digital Converter (ADC) is given below. The input is 0 ≤ V_{IN} ≤ 3 Volts.
The expression for the LSB of the output B_{0} as a Boolean function of X_{2}, X_{1}, and X_{0} is

**A. **

**B. **

**C. **

**D. **

**Answer : ****Option A**

**Explaination / Solution: **

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A single-phase thyristor-bridge rectifier is fed from a 230 V, 50 Hz, single-phase AC mains. If it is delivering a constant DC current of 10 A, at firing angle of 30º, then value of the power factor at AC mains is

**A. ** 0.87

**B. ** 0.9

**C. ** 0.78

**D. ** 0.45

**Answer : ****Option C**

**Explaination / Solution: **

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A single-phase full-bridge voltage source inverter (VSI) is fed from a 300 V battery. A pulse of 120º duration is used to trigger the appropriate devices in each half-cycle. The rms value of the fundamental component of the output voltage, in volts, is

**A. ** 234

**B. ** 245

**C. ** 300

**D. ** 331

**Answer : ****Option A**

**Explaination / Solution: **

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A single-phase, 22 kVA, 2200 V/ 220 V, 50 Hz, distribution transformer is to be connected as an auto-transformer to get an output voltage of 2420 V. Its maximum kVA rating as an autotransformer is

**A. ** 22

**B. ** 24.2

**C. ** 242

**D. ** 2420

**Answer : ****Option C**

**Explaination / Solution: **

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The transfer function of a system is The steady state output y(t) is A cos(2t + φ) for
the input cos(2t). The values of A and φ, respectively are

**A. **

**B. **

**C. **

**D. **

**Answer : ****Option B**

**Explaination / Solution: **

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The phase cross-over frequency of the transfer function is

**A. ** √3

**B. ** 1/√3

**C. ** 3

**D. ** 3√3

**Answer : ****Option A**

**Explaination / Solution: **

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Consider the following asymptotic Bode magnitude plot (ω is in rad/s).

**A. **

**B. **

**C. **

**D. **

**Answer : ****Option A**

**Explaination / Solution: **

Which one of the following transfer functions is best represented by the above Bode magnitude plot?

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Loop transfer function of a feedback system is Take the Nyquist contour in
the clockwise direction. Then, the Nyquist plot of G(s)H(s) encircles -1 + j0.

**A. ** once in clockwise direction

**B. ** twice in clockwise direction

**C. ** once in anticlockwise direction

**D. ** twice in anticlockwise direction

**Answer : ****Option A**

**Explaination / Solution: **

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In a 100 bus power system, there are 10 generators. In a particular iteration of Newton Raphson load flow technique (in polar coordinates), two of the PV buses are converted to PQ type. In this iteration,

**A. ** the number of unknown voltage angles increases by two and the number of unknown voltage magnitudes increases by two.

**B. ** the number of unknown voltage angles remains unchanged and the number of unknown voltage magnitudes increases by two.

**C. ** the number of unknown voltage angles increases by two and the number of unknown voltage magnitudes decreases by two.

**D. ** the number of unknown voltage angles remains unchanged and the number of unknown voltage magnitudes decreases by two.

**Answer : ****Option A**

**Explaination / Solution: **

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