Q1.A single-phase load is supplied by a single-phase voltage source. If the current flowing from the load to the source is 10<− 150°A and if the voltage at the load terminals is 100<60°V , then the
Answer : Option BExplaination / Solution: No Explaination.
Q2.The Voltage Source Inverter (VSI) shown in the figure below is switched to provide a 50 Hz, square-wave
ac output voltage (v0) across an R-L load. Reference polarity of v0 and reference direction of the output
current i0 are indicated in the figure. It is given that R = 3 Ω, L = 9.55 mH.
In the interval when v0 < 0 and i0 > 0 the pair of devices which conducts the load current is
Answer : Option DExplaination / Solution: No Explaination.
Q3.What is the chance that a leap year, selected at random, will contain 53 Sundays?
Answer : Option AExplaination / Solution:
There are 52 complete weeks in a calendar year = 852 × 7 =364 days
Number of days in a leap year = 366
Probability of 53 Saturdays =2/7
Q6.A source vs(t) = V cos 100πt has an internal impedance of (4 + j3)Ω. If a purely
resistive load connected to this source has to extract the maximum power out of
the source, its value in Ω should be
Answer : Option CExplaination / Solution: No Explaination.
Q8.A 4-pole induction motor, supplied by a slightly unbalanced three-phase 50Hz source, is rotating at 1440 rpm. The electrical frequency in Hz of the induced negative sequence current in the rotor is
Answer : Option BExplaination / Solution: No Explaination.
Q9.The Voltage Source Inverter (VSI) shown in the figure below is switched to provide a 50 Hz, square-wave ac output voltage (v0) across an R-L load. Reference polarity of v0 and reference direction of the output current i0 are indicated in the figure. It is given that R = 3 Ω, L = 9.55 mH.
Appropriate transition i.e., Zero Voltage Switching (ZVS) / Zero Current Switching (ZCS) of the IGBTs during turn-on / turn-off is
Answer : Option DExplaination / Solution: No Explaination.