Fundamental of Electrical Engineering MCQs with answers for all electrical related test preparation online.
Fundamental of Electrical Engineering MCQs
TRIAC is a semiconductor power electronic device which contains:
A. Two SCR’s connected in reverse parallel
B. Two SCR’s connected in parallel
C. Two SCR’s connected in series
D. Two BJT’s connected in series
An SCR can be used:
A. as static conductor
B. for power control
C. for speed control of dc shunt motor
D. All of these
Bidirectional semiconductor device is:
A. Diode
B. BJT
C. SCR
D. TRIAC
A full wave rectifier with resistive load produces:
A. Second harmonic
B. Third harmonic
C. Fifth harmonic
D. Do not produce harmonics
An ideal diode is:
A. Unidirectional
B. Bidirectional
C. Fixed voltage polarity
D. Only (a) and (c)
The IGBT resulted in higher switching speed and lower energy losses. It can be used for:
A. Uninterruptible power supplies
B. Induction heating system
C. Constant voltage and frequency power supplies
D. All of these
Harmonics in 3 phase inverters can be reduced by using:
A. Passive filter
B. Active filter
C. Both passive and active filters
D. None of these
The on – state voltage drop of IGBT consists of:
A. Drop across the collector junction
B. Drop across the drift region
C. Drop across MOSFET portion
D. All of these
The maximum firing angle in the half wave controlled regulator is:
A. 180 degree
B. 190 degree
C. 200 degree
D. 210 degree
The power MOSFET device is a:
A. Current controlled unipolar device
B. Voltage controlled unipolar device
C. Current controlled bipolar device
D. Voltage controlled bipolar device
To detect an over – current fault condition, the most reliable method is to connect a:
A. Current sensor across IGBT
B. Voltage sensor across IGBT
C. Current sensor in series with IGBT
D. Voltage sensor in series with IGBT
