TasDia Network
TasDia Network

MCQs 1: In a 3 phase VSI SPWM to use a single carrier signal and preserve the features of PWM technique, the normalized carrier frequency should be____________?

Multiple of two Odd multiple of three Odd multiple of five Odd multiple of seven
Answer Explanation

MCQs 2: For commutation in three phase PAC, normally balanced three phase voltages VR, VY and VB are connected to the three legs of the converter via______________?

Three inductances Three capacitances Three resistance Three transistors
Answer Explanation

MCQs 3: If all the SCR’s of 3 phase PAC is replaced by diodes, they would be triggered_____________?

120 degree after the zero crossing of the corresponding line voltages 60 degree after the zero crossing of the corresponding line voltages 120 degree before the zero crossing of the corresponding line voltages 60 degree before the zero crossing of the corresponding line voltages
Answer Explanation

MCQs 4: The ability of an electronic system to function properly in its intended electromagnetic environment and should not be a source of pollution to that electromagnetic environment is known as____________?

Susceptibility Emission Interference Electromagnetic compatibility
Answer Explanation

MCQs 5: The opposite of susceptibility is___________?

Immunity Emission Interference Electromagnetic compatibility
Answer Explanation

MCQs 6: The output current in PWM DC – DC converters is equal to___________?

Average value of the output inductor current Product of an average inductor current and a function of duty ratio Either A. or B. None of these
Answer Explanation

MCQs 7: A step – down choppers can be used in___________?

Electric traction Electric vehicles Machine tools All of these
Answer Explanation

MCQs 8: In a lossless inverter, the average power absorbed in one period by the load must be__________?

Equal to the average power supplied by the dc source Greater than the average power supplied by the dc source Lesser than the average power supplied by the dc source Equal to the average power supplied by the ac source
Answer Explanation

MCQs 9: The ac voltage controller can be used for ___________?

Lighting and heating control On – line transformer tap changing Soft starting All of these
Answer Explanation

MCQs 10: In a full bridge VSI, in order to avoid the short circuit across the DC bus and the undefined AC output voltage condition, the modulating technique should ensure that___________?

Top switch of each leg is on at any instant Bottom switch of each leg is on at any instant Either A. or B. None of these
Answer Explanation

MCQs 11: The phase angle of gate signal in TRIAC can be shifted by using_____________?

A capacitor A variable resistor An inductor Only (a) and (b)
Answer Explanation

MCQs 12: In the SPWM, the modulating signal is___________?

Square Sinusoidal Triangular Saw – tooth
Answer Explanation

MCQs 13: A TRIAC can be turned on with______________?

Positive voltage at the gate terminal Negative voltage at the gate terminal Either (a) or (b) None of these
Answer Explanation

MCQs 14: The transfer function of PWM is generally developed in______________?

Time domain Frequency domain Either A. or B. None of these
Answer Explanation

MCQs 15: DIAC and TRIAC both are semiconductors devices and conduct in____________________?

DIAC conducts in forward direction and TRIAC conducts in reverse direction Both conducts in forward direction Both conducts in reverse direction Both conducts in either direction
Answer Explanation

MCQs 16: The Graetz bridge makes excellent use of ______________?

Current transformer Potential transformer Power transformer SCR
Answer Explanation

MCQs 17: In constant frequency PWM, at perturbation the amplitude of the sinusoidal component is a___________?

Linear function Non linear function Constant function None of these
Answer Explanation

MCQs 18: If the firing angle becomes negative, then the rectifier begins to work as_______________?

A rectifier An inverter A chopper A regulator
Answer Explanation

MCQs 19: In a 3 phase half wave rectifier, when firing angle is less than 90 degree, then the average dc output voltage becomes__________________?

Positive Negative Zero None of these
Answer Explanation

MCQs 20: Transformer utilization factor is a measure of the merit of a rectifier circuit. It is the ratio of_______________?

AC input power to the transformer volt – amp rating required by secondary AC input power to the transformer volt – amp rating required by primary DC output power to the transformer volt – amp rating required by secondary DC output power to the transformer volt – amp rating required by primary
Answer Explanation

Related Topics

About Us | Contact Us | Privacy Policy
ABOUT US
Category
Who We Are

TasDia Network, this platform not only provides you the best educational stuff but besides this, we are creating thousands of new ideas to making your signature and planning much more on a single platform.

© 2020-2023, TasDia Network

All rights of the publication are reserved by tasdia.com.