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MAHATRANSCO AE Recruitment 2017- Electrical Quiz 28

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Question 1

A 12-pole, 440 V, 50 Hz, 3-phase synchronous motor takes a line current of 100 A at 0.8 pf leading. Neglecting losses, the torque developed will be

Question 2

Power factor of an alternator driven by constant prime mover input can be changed by changing its

Question 3

A step down chopper having source voltage 250V with inductor 350mH and resistor 10Ω is having a duty ratio of 0.8 switched at frequency of 1.5KHz. Find the peak to peak ripple in load current.

Question 4

Consider the following statements:
1. Both voltage source inverter and current source inverter require feedback diodes.
2. Only current source inverter requires feedback diodes.
3. GTOs can not be used in a current source inverter.
4. Only voltage source inverter requires feedback diodes.
Which of these statements is/are correct?

Question 5

In a single-phase to 1-phase cyclo-converter, the magnitudes of harmonic components are quite large. How can they be reduced?

Question 6

Statement (I): A switched-mode dc power supply has high efficiency and light weight.
Statement (II): A switched-mode dc power supply uses a dc to dc switching converter switched at high frequency.

Question 7

Current source inverters are suitable for supplying power to
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Jul 3ESE & GATE EE