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- Question
You are measuring the current in a circuit that is operated on an 18 V battery. The ammeter reads 40 mA. Later you notice the current has dropped to 20 mA. How much has the voltage changed?
Options- A. 9 V
- B. 900 mV
- C. 0 V
- D. 18 V
- Correct Answer
- 9 V
- 1. An ammeter is an electrical instrument used to measure
Options- A. current
- B. voltage
- C. resistance
- D. none of the above Discuss
- 2. A series circuit consists of three resistors. Two resistors are 1.2 kΩ each. The total resistance is 12 kΩ. The value of the third resistor
Options- A. is 9,600 Ω
- B. is 960 Ω
- C. is 1.2 kΩ
- D. cannot be determined Discuss
- 3. In a certain low-pass filter, fc = 3.5 kHz. Its passband is
Options- A. 0 Hz to 3.5 kHz
- B. 0 Hz
- C. 3.5 kHz
- D. 7 kHz Discuss
- 4. A 90 Ω resistor, a coil with 30 Ω of reactance, and a capacitor with 50 Ω of reactance are in series across a 12 V ac source. The current through the resistor is
Options- A. 9 mA
- B. 90 mA
- C. 13 mA
- D. 130 mA Discuss
- 5. When the speed at which a conductor is moved through a magnetic field is increased, the induced voltage
Options- A. increases
- B. decreases
- C. remains constant
- D. reaches zero Discuss
- 6. A red, red, orange, gold resistor has a nominal value of
Options- A. 22,000 Ω
- B. 2,200 Ω
- C. 22 Ω
- D. 2.2 Ω Discuss
- 7. Second-order determinants are evaluated by subtracting the signed cross-products.
Options- A. True
- B. False Discuss
- 8. In a parallel RLC circuit, the smaller reactance determines the net reactance of the circuit.
Options- A. True
- B. False Discuss
- 9. Four equal-value resistors are in series with a 12 V battery and 13.63 mA are measured. The value of each resistor is
Options- A. 22 Ω
- B. 220 Ω
- C. 880 Ω
- D. 88 Ω Discuss
- 10. A resonant circuit has a lower critical frequency of 7 kHz and an upper critical frequency of 13 kHz. The bandwidth of the circuit is
Options- A. 7 kHz
- B. 13 kHz
- C. 20 kHz
- D. 6 kHz Discuss
More questions
Correct Answer: current
Correct Answer: is 9,600 Ω
Correct Answer: 0 Hz to 3.5 kHz
Correct Answer: 130 mA
Correct Answer: increases
Correct Answer: 22,000 Ω
Correct Answer: False
Correct Answer: True
Correct Answer: 220 Ω
Explanation:
Total Resistance, r = 12 / 13.63
= 0.880 in ohms
Total Resistance, r= 880
Each resistance value = r/4
= 880/4
Each resistance value = 220 ohms.
Correct Answer: 6 kHz
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