Basic Electrical Engineering MCQ Questions
1- The alternative magnetic flux in a conductor caused by the flowing neighboring conductor gives rise to a circulating current. This causes an apparent increase in resistance of a conductor. This phenomenon is called.
(A) Corona
(B) Proximity effect
(C) Ferranti effect
(D) Skin effect
2- A line integral can be converted to surface integral by:
(A) Biot-Savart law
(B) Stoke theorem
(C) Lenz law
(D) Ampere’s circuital law
3- A flow meter that measures flow rates which are independent of density is:
(A) Orifice meter
(B) Venturi-meter
(C) Electromagnetic flow meter
(D) Rotameter
4- The starter in DC motor
(A) Limit the armature current to its rated current
(B) Control the voltage regulation
(C) Enhance the efficiency of DC motor
(D) Reduce the armature reaction
5- The voltage magnification, ‘Q’ at resonance is given by:
(A) Average power at resonance / Reactive power at resonance
(B) Reactive power at resonance frequency / Average power at resonance
(C) Band width / Average power at resonance
(D) Resonance frequency / Average power at resonance
6- The voltage and frequency of electric railway transmission line is:
(A) 25 kV, 50 Hz
(B) 25 kV, 1 kHz
(C) 25 kV, 10 kHz
(D) 440 V, 50 Hz
7- For a pulse transformer, the material used for its core and possible turn ratio from primary to secondary are, respectively:
(A) Power iron; 1:1
(B) Ferrite; 1:1
(C) Laminated iron; 1:1
(D) Ferrite; 20:1
8- The function of chimney in coal based plant is to:
(A) Dispose of hazardous smoke and gases high up in the atmosphere
(B) Enable the boiler to maintain high pressure and temperature
(C) Economize the heat recovery from fuel gases
(D) Create positive pressure forced draught
9- Induction heating of non-metallic materials such as wood, glass etc. are due to:
(A) Copper loss
(B) Thermal conduction
(C) Dielectric loss
(D) Hysteresis loss
10- Irradiation energy of sun can be directly used to produce electrical energy by:
(A) MHD generators
(B) Photo-voltaic cell
(C) Plasma at high temperature
(D) Fuel cell
11- In Brushless DC motor (BLDC):
(A) Magnetic field strength increases with increase of speed
(B) Torque will reduce as the speed increases
(C) Torque is independent to speed
(D) Torque is directly proportional to speed
ANSWERS:
1-(B), 2-(B), 3-(C), 4-(A), 5-(B), 6-(D), 7-(B), 8-(A), 9-(C), 10-(B), 11-(B)