1. The working voltage of a capacitor to which AC of pulsating DC is applied should be
a) the same as or greater than the applied voltage
b) at least 50% greater than the applied voltage
c) 1.41 times the applied voltage
d) 0.707 times applied voltage
ans. b
2. A circuit contains 10 ohms of resistance, 20 ohms of inductive reactance, and 30 ohms of capacitive reactance. The circuit is
a) inductive
b) in resonance
c) resistive
d) capacitive
ans. d
3. The opposition offered by a coil to the flow of alternating current is known as
a) conductivity
b) impedance
c) reluctance
d) inductive reactance
ans. d
4. An increase in the inductive reactance of a circuit will be due to increase in
a) inductance and frequency
b) capacitance and voltage
c) resistance and voltage
d) resistance and capacitive reactance
ans. a
5. The resistive force in a DC electrical circuit is measured in ohms and referred to as
a) resistance
b) capacitance
c) reactance
d) inductance
ans. a
6. When the capacitive reactance in an AC electrical circuit is equal to the inductive reactance, the circuit is
a) in correct voltage phase angle
b) in correct current phase angle
c) out of phase
d) resonant
ans. d
7. In an alternating current circuit, the effective voltage
a) is equal to the maximum instantaneous voltage
b) is greater than the maximum instantaneous voltage
c) may be greater than or less than the maximum instantaneous voltage
d) is less than the maximum instantaneous voltage
ans. d
8. The amount of electricity a capacitor can store is directly proportional to
a) the distance between the plates and inversely proportional to the plate area.
b) the plate area and is not affected by the distance between the plates
c) the plate area and inversely proportional to the distance between the plates
d) the distance between the plates and is not affected by the plate area
ans. c
9. A transformer step-up ratio of 5 to 1 has a primary voltage of 24 V and a secondary amperage of 0.20 A. The primary amperage will be
a) 1 A
b) 4.8 A
c) 0.40 A
d) cannot be determined from the information given
ans. a
10. The phase relationship between the current and voltage in an inductive circuit is
a) The current lags the voltage by 0 degrees
a) The current lags the voltage by 90 degrees
a) The current leads the voltage by 90 degrees
a) The current leads the voltage by 0 degrees
ans. a
