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MCQs

Total Questions : 219 | Page 4 of 22 pages
Question 31. An open resistor, when checked with an ohmmeter reads
  1.    Zero
  2.    Infinite
  3.    High but within tolerance
  4.    Low but not zero
 Discuss Question
Answer: Option B. -> Infinite
Question 32. Sparking occurs when a load is switched off because the circuit has high
  1.    Resistance
  2.    Inductance
  3.    Capacitance
  4.    Impedance
 Discuss Question
Answer: Option B. -> Inductance
Question 33. One Newton meter is same as
  1.    One watt
  2.    One joule
  3.    Five joules
  4.    One joule second
 Discuss Question
Answer: Option B. -> One joule
Question 34. Electric current passing through the circuit produces
  1.    Magnetic effect
  2.    Luminous effect
  3.    Thermal effect
  4.    Chemical effect
 Discuss Question
Answer: Option C. -> Thermal effect
Question 35. The filament of an electric bulb is made of
  1.    Carbon
  2.    Aluminium
  3.    Tungsten
  4.    Nickel
 Discuss Question
Answer: Option C. -> Tungsten
Question 36. Whether circuit may be AC. or D.C. one, following is most effective in reducing the magnitude of the current.
  1.    Reactor
  2.    Capacitor
  3.    Inductor
  4.    Resistor
 Discuss Question
Answer: Option D. -> Resistor
Question 37. Varistors are
  1.    Insulators
  2.    Nonlinear resistors
  3.    Carbon resistors
  4.    Resistors with zero temperature coefficients
 Discuss Question
Answer: Option B. -> Nonlinear resistors
Question 38. Temperature coefficient of resistance is expressed in terms of
  1.    ohms/°C
  2.    mhos/ohm°C
  3.    ohms/ohm°C
  4.    mhos/°C
 Discuss Question
Answer: Option C. -> ohms/ohm°C
Question 39. Resistance of a material always decreases if
  1.    Temperature of material is decreased
  2.    Temperature of material is increased
  3.    Number of free electrons available becomes more
  4.    None of the above is correct
 Discuss Question
Answer: Option C. -> Number of free electrons available becomes more
Question 40. The rating of a fuse wire is always expressed in
  1.    Ampere-hours
  2.    Ampere-volts
  3.    kWh
  4.    Amperes
 Discuss Question
Answer: Option D. -> Amperes

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