A. Breakdown of junction
B. Local hot spot
C. Insulation failure
D. None of these
Correct Answer: Local hot spot ✔
Last Updated: October 20, 2018
Related MCQs
- For similar carrier and modulating signals, the line current used in CSI is__________?
- During the commutation period in 3 phase converter, overlap time is__________?
- The effects of EMI can be reduced by__________?
- An SCR is made up of silicon because__________?
- AC power in a load can be controlled by using__________?
- The switching function of semiconductor devices can be characterized with__________?
- Electrical power output in a D.C. generator is equal to__________?
- If a shunt motor is started with its field winding open then__________?
- The power demand can be estimated approximately by__________?
- Power electronics essentially deals with control of a.c. power at__________?
- In a push – pull converter, the filter capacitor can be obtained as__________?
- MOSFET stands for__________?
- In a flyback converter, the inductor of the buck-boost converter has been replaced by a__________?
- Advantages of Cuk converter is / are__________?
- A MOSFET, for its conduction uses__________?
- An RC snubber network used in BJT__________?
- The ac output voltage waveform of VSI and AC output current waveform of CSI respectively is composed of__________?
- If energy is taken from the AC side of the inverter and sends it back into the DC side, then it is known as__________?
- A combination of synchronized leading edge and trailing edge modulation has also been used to control a__________?
- Regulator sampling PWM is usually used in__________?
- 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__________?
- In square wave operation mode of 3 phase VSI, the VSI
- 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__________?
- If all the SCR’s of 3 phase PAC is replaced by diodes, they would be triggered__________?
- 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__________?
- The opposite of susceptibility is__________?
- The output current in PWM DC – DC converters is equal to__________?
- A step – down choppers can be used in__________?
- In a lossless inverter, the average power absorbed in one period by the load must be__________?
- The ac voltage controller can be used for __________?
- 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__________?
- The phase angle of gate signal in TRIAC can be shifted by using__________?
- In the SPWM, the modulating signal is__________?
- A TRIAC can be turned on with__________?
- The transfer function of PWM is generally developed in__________?
- DIAC and TRIAC both are semiconductors devices and conduct in__________?
- The Graetz bridge makes excellent use of __________?
- In constant frequency PWM, at perturbation the amplitude of the sinusoidal component is a__________?
- If the firing angle becomes negative, then the rectifier begins to work as__________?
- In variable frequency, PWM gain
- In a 3 phase half wave rectifier, when firing angle is less than 90 degree, then the average dc output voltage becomes__________?
- Transformer utilization factor is a measure of the merit of a rectifier circuit. It is the ratio of__________?
- A carrier based PWM technique in CSI is composed of__________?
- In a square – wave operation of 3 phase CSIs, the power values are on for__________?
- Ripple factor is the ratio of__________?
- Form factor of a rectifier is the ratio of __________?
- Silicon controlled rectifier can be turned on__________?
- TRIAC is a semiconductor power electronic device which contains__________?
- The curve between V and I of SCR when anode is positive w.r.t cathode and when anode is negative w.r.t cathode are known as__________?
- An SCR can be used__________?
- With gate open, the maximum anode current at which SCR is turned off from ON condition is called__________?