A.chrome steel
B.cast iron
C.copper
D.aluminium
Explanation: The correct answer is chrome steel.
Submitted by: Academy of Pakistan
Electrical Engineering MCQs: 3,658 practice questions with answer choices and available explanations. Page 220 of 244.
Electrical Engineering MCQs by topic
Basic Electrical MCQs121Power Electronics217Transformers132Transmission and Distribution90D.C. Motors130D.C. Generators120Polyphase Induction Motors99Single Phase Induction Motors110Synchronous Motors122Network Theorems47Economics of Power Generation98A.C. Fundamentals, Circuits and Circuit Theory109Cables57Electrolysis and Storage of Batteries119Electrostatics180Magnetic Circuit28Rectifiers and Converters58Magnetism and Electromagnetism85Electromagnetic Induction85Switchgear and Protection102OP-AMP Circuits24Heating and Welding50Earthing or Grounding11Parallel Circuits25Oscillators28Amplifiers with Negative Feedback18Transistors42Semiconductor Diode44Analog Electronics46Hybrid Parameters12Modulation and Demodulation40Control Systems100Digital Electronics36Electric Traction74Electrical Engineering Materials100Electrical Machine Design103Electronic Instruments30Field Effect Transistors - FET47Industrial Drives70Integrated Circuits15Measurement and Instrumentation109Multi-Stage Transistor Amplifiers40Power Generation121Regulated D.C. Power Supply39SCR (Silicon Controlled Rectifiers)25Semiconductor Theory35Single Stage Transistor Amplifiers38Solid-State Switching Circuits29Transistor Audio Power Amplifiers39Transistor Biasing40Transistor Tuned Amplifiers40Series-Parallel Circuits29Passive Filters20Operational Amplifier30
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Electrical Engineering MCQs
Showing page 220 of 244 · 3,658 total solved questions available.
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A.reluctance
B.thermal conductivity
C.conductance
D.resistance
Explanation: The correct answer is conductance.
Submitted by: Academy of Pakistan
A.Hysteresis motor
B.Schrage motor
C.Reluctance motor
D.Universal motor
Explanation: The correct answer is Schrage motor.
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A.P
B.None of the above
C.P/3
D.3P
Explanation: Assume 3 numbers of pure resistive loads each of value R.
When these loads are connected in delta the power in each resistor is V^2/R and the total power is 3×V^2/R.
When these loads are connected in star the voltage applied across each = V/(sqrt of 3). Power in each load becomes = V^2/(3×R) . and the total load is =(3×V^2)/(3×R)=V^2/R. You can see this is 3 times less than the total power when the loads are connected in delta.
One important point is that the loads should withstand higher voltage (line voltage) and higher current when connected in delta than when they are connected in star
so power in delta is 3 time power correct answer is 3P
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A.Gas-filled triode
B.Tetrode
C.Triode
D.Pentode
Explanation: The correct answer is Gas-filled triode.
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A.Magnetic effect
B.Heating effect
C.Photoelectric effect
D.Electrostatic effect
Explanation: The correct answer is Heating effect.
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A.Carbon
B.Germanium
C.None of the above
D.Silicon
Explanation: The correct answer is Silicon.
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A.None of the above
B.Less than
C.Greater than
D.Equal to
Explanation: The correct answer is Greater than.
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A.overloading of running winding
B.none of the above
C.damage to the centrifugal switch
D.damage to the starting winding
Explanation: The correct answer is damage to the starting winding.
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A.none of the above
B.the rotor excitation, supply voltage and maximum value of coupling angle (90°)
C.the rotor excitation and supply volt-age both
D.the supply voltage only
E.the rotor excitation only
Explanation: The correct answer is the rotor excitation, supply voltage and maximum value of coupling angle (90°).
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A.unity power factor
B.0.707 power factor lagging
C.0.707 power factor leading
D.zero power factor leading
Explanation: The correct answer is unity power factor.
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A.iron loss in core
B.increase in temperature
C.capacitive effect between adjacent coil turns
D.skin effect
Explanation: The correct answer is iron loss in core.
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A.all resistors
B.all inductors
C.all transistors
D.all capacitors
Explanation: The correct answer is all capacitors.
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A.Resistance
B.Current
C.Voltage
D.Power
Explanation: The correct answer is Current.
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A.Electrolytic capacitor must be connected in the correct polarity
B.Ceramic capacitors must be connected in the correct polarity
C.Mica capacitors are available in capacitance value of 1 to 10 pF
D.Air capacitors have a black band to indicate the outside foil
Explanation: The correct answer is Electrolytic capacitor must be connected in the correct polarity.
Submitted by: Academy of Pakistan