Questions and answers for exam Preparation

MCQs

Total Questions : 227 | Page 5 of 23 pages

Question 41. Doubling the number of turns of wire in an inductor:

reduces the value of inductance by one-half
multiplies the value of inductance by two
reduces the value of inductance by one-fourth
multiplies the value of inductance by four
None of these

Discuss Question

Answer: Option D. -> multiplies the value of inductance by four

Question 42. What is the capacitive reactance of a 0.1 micro F capacitor that is operating at 1000 Hz?

less than 1 Ohm
None of these
312 Ohm
690 Ohm
1590 Ohm

Discuss Question

Answer: Option E. -> 1590 Ohm

Question 43. A farad is defined as the amount of capacitance necessary for:

dissipating 1 W of power
storing 1 V for 1 second
None of these
changing the voltage on the plates at the rate of 1 V per second when 1 A of current is flowing
causing an ac phase shift greater than 90 degree

Discuss Question

Answer: Option D. -> changing the voltage on the plates at the rate of 1 V per second when 1 A of current is flowing

Question 44. Which one of the following statements is true for current flowing in a parallel circuit?

The amount of current flow through each branch of a parallel circuit can be different, depending on the resistance of each branch part and the amount of voltage applied to it
None of these
The total current in a parallel circuit is equal to the total voltage multiplied by the total resistance
The same current always flows through every part of a parallel circuit
The total current in a parallel circuit is always less than the smallest amount of current

Discuss Question

Answer: Option A. -> The amount of current flow through each branch of a parallel circuit can be different, depending on the resistance of each branch part and the amount of voltage applied to it

Question 45. Holes are the minority carriers in which type of semiconductor?

None of these
Intrinsic
n-type
Extrinsic
p-type

Discuss Question

Answer: Option C. -> n-type

Question 46. Which one of the following statements is true for current flowing in a series circuit?

The total current in a series circuit is equal to the total voltage multiplied by the total resistance
The total current in a series circuit is equal to the sum of the currents flowing through the individual components in the circuit
The amount of current flow through each part of a series circuit can be different, depending on the resistance of each part and the amount of voltage applied to it
None of these
The same current flows through every part of a series circuit

Discuss Question

Answer: Option E. -> The same current flows through every part of a series circuit

Question 47. The total inductance of a series inductor circuit is:

equal to the source voltage divided by total current
None of these
equal to the sum of the individual inductive-reactance values
less than the value of the smallest inductor
equal to the sum of the individual inductance values

Discuss Question

Answer: Option E. -> equal to the sum of the individual inductance values

Question 48. Which one of the following statements is true for the currents in a parallel RC circuit?

The total current is equal to the sum of the currents for the resistance and capacitance
None of these
The current always has the same amplitude and phase for every part of the circuit
The total current is less than the sum of the currents for the resistance and capacitance
The total current. is greater than the sum of the currents for the resistance and capacitance

Discuss Question

Answer: Option A. -> The total current is equal to the sum of the currents for the resistance and capacitance

Question 49. A certain power transformer has a turns ratio of 5. What voltage can you expect at the secondary winding when you apply 120 V to the primary winding?