Resistance and Power Questions and Answers

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Q31
How many connections does a rheostat have?
  • A 1
  • B 2
  • C 3
  • D 4
Answer: Option B
Q32
What are the parts of a rheostat?
  • A wiper and resistor track
  • B solenoid and armature
  • C contact and wire wound
  • D center tape and wiper
Answer: Option A
Q33
The load resistance increases. How will the load current change?
  • A vary
  • B remain constant
  • C increase
  • D decrease
Answer: Option D
Q34
What is the power dissipated by a 1.2 komega.gif resistor with 12 volts across it?
  • A 12 A
  • B 1.2 A
  • C 12 A
  • D 12 mA
Answer: Option C
Q35
How many joules of energy will a 10 W lamp dissipate in one minute?
  • A 10 joules
  • B 60 joules
  • C 600 joules
  • D 3600 joules
Answer: Option C
Q36
Which type of test equipment is used to measure resistors?
  • A ohmmeter
  • B ammeter
  • C voltmeter
  • D watt meter
Answer: Option A
Q37
Resistance is:
  • A the opposition to current flow accompanied by the dissipation of heat
  • B symbolized by R, measured in ohms, and directly proportional to conductance
  • C directly proportional to current and voltage
  • D represented by the flow of fluid in the fluid circuit
Answer: Option A
Q38
Electrical equipment is protected against excessive current by a(n):
  • A fusible wire link
  • B insulated glass container
  • C metal ended coil
  • D circuit opener
Answer: Option A
Q39
If resistance decreases, then current will:
  • A decrease
  • B increase
  • C remain the same
  • D double
Answer: Option B
Q40
A wire with a smaller cross-sectional area will produce:
  • A less heat
  • B more conductance
  • C less resistance
  • D more heat
Answer: Option D

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