Electrical MCQ Questions
Choose the correct answer:
- The forbidden energy gap for germanium is:
- (A) 0.3 eV
- (B) 3.5 eV
- (C) 0.72 eV
- (D) 1.1 eV
- The band gap of silicon at room temperature is:
- (A) 1.3 eV
- (B) 0.7 eV
- (C) 1.1 eV
- (D) 1.4 eV
- The earth wires are made of:
- (A) Copper
- (B) Aluminium
- (C) Iron
- (D) Galvanized stranded steel
- The rating of a fuse is expressed in:
- (A) Volts
- (B) Amperes
- (C) Ampere-volts
- (D) Ampere-hours
- A fuse is:
- (A) Always connected in series with the circuit
- (B) Always connected in parallel with the circuit
- (C) Normally connected in series with the circuit
- (D) Normally connected in parallel with the circuit
- The size of conductor used in power cables depends on:
- (A) Operating voltage
- (B) Power factor
- (C) Current to be carried
- (D) Type of insulation used
- Ohm’s law is applied to:
- (A) Semiconductors
- (B) Electrolytes
- (C) Carbon resistors
- (D) All of these
- Ideal voltage sources have:
- (A) Zero internal resistance
- (B) Infinite internal resistance
- (C) Low current
- (D) Large emf
- Kirchhoff's laws are valid for:
- (A) Linear circuits only
- (B) Passive time invariant circuits
- (C) Nonlinear circuits only
- (D) Both linear and nonlinear circuits
- The unit of impedance is:
- (A) Ohm
- (B) Siemens
- (C) Mho
- (D) Henry
- The peak factor of a sinusoidal waveform is:
- (A) 0
- (B) 1
- (C) 1.11
- (D) 1.41
- The algebraic sum of incoming current equals the outgoing current according to:
- (A) Kirchhoff's Current Law
- (B) Kirchhoff's Voltage Law
- (C) Ohm's Law
- (D) Joule's Law
- The insulation resistance is measured by:
- (A) Ohmmeter
- (B) Insulation meter
- (C) Megger
- (D) Wien bridge
- The filament of an electric bulb is made of:
- (A) Carbon
- (B) Nickel
- (C) Aluminium
- (D) Tungsten
- The power dissipated in a pure capacitor is:
- (A) Zero
- (B) Proportional to voltage
- (C) Proportional to capacitance
- (D) Both B and C
- The material with highest electrical conductivity is:
- (A) Steel
- (B) Aluminium
- (C) Copper
- (D) Silver
- PVC stands for:
- (A) Poly variable conductor
- (B) Poly vinyl chloride
- (C) Pre verified conductor
- (D) Poly voltage chloride
- The direction of induced EMF is determined by:
- (A) Laplace law
- (B) Kirchhoff's law
- (C) Lenz’s law
- (D) Fleming’s right hand rule
- A closed switch has resistance of:
- (A) Zero
- (B) 50 Ω
- (C) 500 Ω
- (D) Infinite
- The energy stored in an inductor of inductance L is:
- (A) i²L
- (B) iL²
- (C) (1/2)Li²
- (D) L²/i