Practice Test: Question Set - 12
1. If N1/N2 = 2, and the primary voltage is 120 V, what is the secondary voltage?
- (A) 0 V
- (B) 36 V
- (C) 40 V
- (D) 60 V
2. When the collector current increases, what does the current gain do?
- (A) Decreases
- (B) Stays the
same
- (C) Increases
- (D) None of the
above
3. An ideal voltage source has
- (A) Zero
internal resistance
- (B) Infinite
internal resistance
- (C) A load
dependent voltage
- (D) A
load-dependent current
4. Which one of the following statements best applies to a parallel RLC circuit?
- (A) The voltage
waveform for each component always has the same amplitude and phase as the
applied voltage
- (B) The sum of
the current is always less than the applied current
- (C) The current
waveform for each component always has the same amplitude and phase as the
applied current
- (D) All of the
above
5. Which one of the following statements is true for the currents in a series RC circuit?
- (A) The
current always has the same amplitude and phase for every part of the circuit
- (B) The
total current is equal to the sum of the currents for the resistance and
capacitance
- (C) The
total current is greater than the sum of the currents for the resistance and
capacitance
- (D) The
total current is less than the sum of the currents for the resistance and
capacitance
6. The knee voltage of a diode is approximately equal to the
- (A) Applied
voltage
- (B) Barrier
potential
- (C) Breakdown
voltage
- (D) Forward
voltage
7. Which one of the following statements most accurately describes the nature of inductive reactance?
- (A) Inductive
reactance is an opposition to current flow in dc circuits
- (B) Inductive
reactance is an opposition to current flow in ac circuits
- (C) Inductive
reactance is another term for counter emf
- (D) Inductive
reactance is a force that tends to overcome the effects of counter emf
8. The transistor has a collector current of 10 mA and a base current of 40 mA. What is the current gain of the transistor?
- (A) 250 μA
- (B) 350 μA
- (C) 0.25 μA
- (D) 300 μA
9. The direction of conventional current flow is:
- (A) From
negative to positive
- (B) From
positive to negative
- (C) From left to
right
- (D) From neutral
to positive
10. Which one of the following statements is true for current flowing in a parallel circuit?
- (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
- (B) The same
current always flows through every part of a parallel circuit
- (C) The
total current in a parallel circuit is equal to the total voltage multiplied by
the total resistance
- (D) The
total current in a parallel circuit is always less than the smallest amount of
current
11. What is the phase shift between total current and voltage, if 100 ohm resistor connected in parallel with an inductor that has a reactance of 200W?
- (A) 0 degree
- (B) 26.6 degree
- (C) 90 degree
- (D) 180 degree
12. Which one of the following kinds of materials has the lowest permeability?
- (A) A
diamagnetic material
- (B) A
paramagnetic material
- (C) A ferromagnetic
material
- (D) All
of the above
13. What is the inductive reactance of a 2-H coil operating at 60 Hz?
- (A) 754 Ohm
- (B) 30 Ohm
- (C) 60 Ohm
- (D) 120 Ohm
14. Which one of the following devices is most often used for measuring opposition to current flow in a circuit?
- (A) Ammeter
- (B) Voltmeter
- (C) Ohmmeter
- (D) Wattmeter
15. Inductive reactance is measured in units of:
- (A) Volts
per second
- (B) Amperes per
second
- (C) Ohm
- (D) Henrys
Next Tests: