Questions and answers for exam Preparation

MCQs

Total Questions : 227 | Page 19 of 23 pages

Question 181. The voltage across a 1N4001 is 0.93V when the current is 1A. What is the power dissipation of the diode for these values?

9.3 W
0.93 W
None of these
0.93 V
0.041666666666667

Discuss Question

Answer: Option B. -> 0.93 W

Question 182. Which one of the following phrases most accurately describes a purely capacitive circuit?

The ac voltage leads the current by 90 degree
Capacitive reactance provides the only opposition to current flow
None of these
Combinations of resistance and capacitive reactance provide any opposition to current flow
Resistances provide the only opposition to current flow

Discuss Question

Answer: Option B. -> Capacitive reactance provides the only opposition to current flow

Question 183. A loadstone is:

a natural magnet
None of these
an artificial magnet
a paramagnetic alloy
a temporary magnet

Discuss Question

Answer: Option A. -> a natural magnet

Question 184. Which one of the following statements is true for the currents in a series RC circuit?

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

Discuss Question

Answer: Option A. -> The current always has the same amplitude and phase for every part of the circuit

Question 185. The saturation point is approximately the same as

infinity
upper end of the load line
None of these
lower end of the load line
cutoff point

Discuss Question

Answer: Option B. -> upper end of the load line

Question 186. Determine the resistance value and tolerance of a resistor that has the following color bands; first band is red, second band is red, third band is orange, and the fourth band is gold

220 Ohm, 10%
22,000 Ohm, 5%
220 Ohm, 5%
22, 000 Ohm, 10%
None of these

Discuss Question

Answer: Option B. -> 22,000 Ohm, 5%

Question 187. Suppose a voltage source has an ideal voltage of 15V and a source resistance of 0.2W. For what values of load resistance will the voltage source appear stiff?

30 Ohm
20 Ohm
10 Ohm
None of these
100 Ohm

Discuss Question

Answer: Option B. -> 20 Ohm

Question 188. Which one of the following is most likely used for measuring the rate of electron flow?

Ohmmeter
None of these
Voltmeter
Wattmeter
Ammeter

Discuss Question

Answer: Option E. -> Ammeter

Question 189. Which one of the following statements regarding ac circuits is correct?

Current lags the voltage through a resistor
None of these
All of these
Current and voltages are in phase through a resistor
Current leads the voltage through a resistor

Discuss Question

Answer: Option D. -> Current and voltages are in phase through a resistor

Question 190. Which one of the following statements most accurately describes the nature of inductive reactance?

Inductive reactance is an opposition to current flow in dc circuits
Inductive reactance is an opposition to current flow in ac circuits
Inductive reactance is a force that tends to overcome the effects of counter emf
Inductive reactance is another term for counter emf
None of these

Discuss Question

Answer: Option B. -> Inductive reactance is an opposition to current flow in ac circuits