GURU MCQs provides Electrical Engineering MCQs for Job Test and Interview Preparation, suitable for fresh graduates, students, and competitive exams. Most repeated Electrical Engineering MCQs section is frequently encountered in CSS, PMS, Inspector, ASI, Sub-inspector, Constable, FPSC, PPSC, ETEA, FIA, Police, Army, Navy, Airforce, IB, MOFA, ASF, LHC, Educators, and various other competitive exams, as well as government and private job assessments. Electrical Engineering most repeated MCQs include Analog and Digital Communications, Control Systems, Power Electronics, Electric Circuits, Electric machines, Electrical measurement & units, Utilization of Electrical Energy, Basic Electrical Engineering, Electrical Installation, Power Systems, Testing & maintenance of electrical equipment’s – and much more.
21. The Graetz bridge makes excellent use of ______________?
A. Current transformer
B. Potential transformer
C. Power transformer
D. SCR
22. DIAC and TRIAC both are semiconductors devices and conduct in____________________?
A. DIAC conducts in forward direction and TRIAC conducts in reverse direction
B. Both conducts in forward direction
C. Both conducts in reverse direction
D. Both conducts in either direction
23. The transfer function of PWM is generally developed in______________?
A. Time domain
B. Frequency domain
C. Either A. or B.
D. None of these
24. A TRIAC can be turned on with______________?
A. Positive voltage at the gate terminal
B. Negative voltage at the gate terminal
C. Either (a) or (b)
D. None of these
25. In the SPWM, the modulating signal is___________?
A. Square
B. Sinusoidal
C. Triangular
D. Saw – tooth
26. The phase angle of gate signal in TRIAC can be shifted by using_____________?
A. A capacitor
B. A variable resistor
C. An inductor
D. Only (a) and (b)
27. 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___________?
A. Top switch of each leg is on at any instant
B. Bottom switch of each leg is on at any instant
C. Either A. or B.
D. None of these
28. The ac voltage controller can be used for ___________?
A. Lighting and heating control
B. On – line transformer tap changing
C. Soft starting
D. All of these
29. In a lossless inverter, the average power absorbed in one period by the load must be__________?
A. Equal to the average power supplied by the dc source
B. Greater than the average power supplied by the dc source
C. Lesser than the average power supplied by the dc source
D. Equal to the average power supplied by the ac source
30. A step – down choppers can be used in___________?
A. Electric traction
B. Electric vehicles
C. Machine tools
D. All of these