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MCQs

Total Questions : 162 | Page 5 of 17 pages
Question 41. What value of direct current must flow through a resistor to produce the same heating power as an alternating current with a peak value of 3.5 A?
  1.    1.5 A
  2.    2.5 A
  3.    3.5 A
  4.    4.5 A
 Discuss Question
Answer: Option B. -> 2.5 A
Answer: (b).2.5 A
Question 42. In an AC circuit, resistance 50 Ω, inductance 0.3 H and capacitance 15 μF is connected to an AC voltage source 25 V, 50 Hz. Determine the phase difference between current and voltage.
  1.    670
  2.    540
  3.    470
  4.    770
 Discuss Question
Answer: Option A. -> 670
Answer: (a).670
Question 43. Inductor does not allow sudden changes in?
  1.    Voltage
  2.    Current
  3.    Resistance
  4.    Inductance
 Discuss Question
Answer: Option B. -> Current
Answer: (b).Current
Question 44. What is the current in an inductive circuit when the applied voltage is maximum?
  1.    Infinity
  2.    Maximum
  3.    Zero
  4.    Cannot be determined
 Discuss Question
Answer: Option C. -> Zero
Answer: (c).Zero
Question 45. What is the value of current in an inductive circuit when there is no applied voltage?
  1.    Minimum
  2.    Maximum
  3.    Zero
  4.    Cannot be determined
 Discuss Question
Answer: Option B. -> Maximum
Answer: (b).Maximum
Question 46. Inductance is _____________________ to number of turns in the coil.
  1.    directly proportional
  2.    inversely proportional
  3.    equal
  4.    not related
 Discuss Question
Answer: Option A. -> directly proportional
Answer: (a).directly proportional
Question 47. Choke involve use of _____________
  1.    Resistor
  2.    Capacitor
  3.    Inductor
  4.    Transistor
 Discuss Question
Answer: Option C. -> Inductor
Answer: (c).Inductor
Question 48. A resistance of 7 ohm is connected in series with an inductance of 31.8mH. The circuit is connected to a 100V 50Hz sinusoidal supply. Calculate the voltage across the resistor.
  1.    31.8V
  2.    57.4V
  3.    67.3V
  4.    78.2V
 Discuss Question
Answer: Option B. -> 57.4V
Answer: (b).57.4V
Question 49. Which, among the following, is the correct expression for φ.
  1.    φ=tan¯¹ (XL/R)
  2.    φ=tan¯¹ (R/XL)
  3.    φ=tan¯¹ (XL*R)
  4.    φ=cos¯¹ (XL/R)
 Discuss Question
Answer: Option A. -> φ=tan¯¹ (XL/R)
Answer: (a).φ=tan¯¹ (XL/R)
Question 50. A resistance of 7 ohm is connected in series with an inductance of 31.8mH. The circuit is connected to a x V 50Hz sinusoidal supply. The current in the circuit is 8.2A. Calculate the value of x.
  1.    10V
  2.    50V
  3.    100V
  4.    120V
 Discuss Question
Answer: Option C. -> 100V
Answer: (c).100V

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