Electrical Engineering is part of Engineering and holds 3,646 questions with answers, free to read and with no account needed.
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Answer: B. has higher wattage rating
A rheostat is typically designed with a higher wattage rating than a potentiometer because it controls current directly. Handling large electrical currents requires thicker resistive elements capable of dissipating subst...
Answer: A. Printing machine
Printing machines experience continuous and heavy load fluctuations during high speed paper feeding and printing. Variable torque demands require printing presses to utilize robust mechanical drives and motor controls. S...
Answer: B. V/A
Electric intensity, or electric field strength, measures potential difference distributed across a specific distance interval. Potential measured in volts divided by distance represented dimensionally matches the intensi...
Answer: D. Braking
Flour mills require constant running and high starting torque for heavy milling machinery. Electric braking is generally unnecessary for their standard continuous grinding operation. Motors operate steadily without needi...
Answer: B. 400 mA
Calculating the parallel resistance of thirty-five and fourteen ohms yields exactly ten ohms of equivalent resistance. Adding the series resistor of five ohms gives a total circuit resistance of fifteen ohms altogether....
Answer: D. all of the above
Galvanometers, ammeters, and voltmeters all operate based on magnetic torque exerted on current-carrying conductors inside a magnetic field. When electric current flows through a movable coil positioned within a permanen...
Answer: D. Transformer
A transformer operates on electromagnetic induction between stationary coils of wire. It transfers energy without creating mechanical rotation or kinetic movement. This distinguishes transformers from electromechanical d...
Answer: A. Induction motor
Induction motors deliver dependable starting torque and maintain stable rotational speeds under fluctuating mechanical loads. Their robust squirrel-cage construction eliminates brushes and commutators, ensuring minimal m...
Answer: C. Jaipur
Jaipur historically developed on a meter-gauge rail network established during the nineteenth century princely era. Upgrading narrow and meter-gauge tracks to broad gauge required massive engineering projects across Indi...
Answer: D. BGA
Ball Grid Array packaging utilizes the entire bottom surface for connection pins, accommodating the highest pin count in a compact footprint. Replacing peripheral leads with an array of solder balls underneath the chip c...
Answer: A. Decreases
Forward bias voltage supplies an external electric field that directly counteracts the internal barrier potential. Reducing the internal barrier potential allows majority charge carriers to cross the junction much more e...
Answer: C. both A. and B.
Longer axle wheelbases make it mechanically difficult for rigid wheelsets to navigate sharp railway curves smoothly. Sharper track curvature increases the geometric mismatch between parallel wheels, leading to severe sli...
Answer: C. Vacuum system
Traditional steam locomotives rely on a vacuum braking system driven by ejectors. These ejectors create negative pressure to actuate brake shoes against train wheels. Vacuum braking provided reliable stopping power for e...
Answer: B. Rearing
Bearings support the high-speed rotating shaft and experience constant mechanical friction during every operating cycle. Inadequate lubrication leads directly to excessive heat generation, mechanical wear, and eventual c...
Answer: B. 275
To convert binary 10111101 to octal, group bits in threes from the right: 10 (2), 111 (7), 101 (5), resulting in 275. Grouping binary digits into triads starting from the least significant bit allows direct translation i...
