# 250+ TOP MCQs on Shunts and Multipliers and Answers

Electrical Measurements & Measuring Instruments Multiple Choice Questions on “Shunts and Multipliers”.

1. Range of an electrical instrument depends on __________
a) current
b) voltage
c) power
d) resistance
Clarification: The amount of current safely passing through the coil of the instrument and the spiral springs. This acts as the leads of the current to the instrument. As a result, the range of an electrical instrument depends on the current.

2. Moving coil instruments have a current and voltage rating of __________
a) 100 A and 25 V
b) 50 mA and 50 mV
c) 75 nA and 100 μV
d) 25 μA and 75 V
Clarification: Moving coil instruments are designed to function as Ammeters and Voltmeters. They have a maximum current carrying capacity of 50 mA with a voltage rating of 50 mV.

3. A shunt is a __________
a) very high resistance
b) medium resistance
c) very low resistance
d) high resistance
Clarification: Usually shunt is a very low value of resistance. It is connected in parallel with the ammeter coil. Through this we can extend the range of an ammeter.

4. A shunt can be used to measure large currents.
a) True
b) False
Clarification: A shunt is normally a very low value of resistance, connected in parallel with the ammeter coil. By making use of a low range ammeter, large current values can be measured through a shunt.

5. Current terminals have a small current capacity.
a) True
b) False
Clarification: A shunt is normally a very low value of resistance, connected in parallel with the ammeter coil. In a shunt, the current terminals have a large current capacity and are connected in series.

6. Potential terminals have a __________
a) high current capacity
b) low voltage capacity
c) low current capacity
d) high voltage capacity
Clarification: A shunt is normally a very low value of resistance, connected in parallel with the ammeter coil. In a shunt, the potential terminals have a low current carrying capacity. As a result, a low range ammeter is used to measure the large current.

7. In case of AC ammeters, shunts consist of __________
a) impedance
b) capacitance
c) resistance
d) inductance
Clarification: AC ammeter shunts comprise of the inductances of the ammeter as well as the shunt. In order to extend the range of an AC ammeter, inductances of the ammeter and the shunt are taken into account.

8. What is the effect of the ammeter range on the shunt resistance?
a) no effect
b) varies by a factor of multiplying factor
c) varies by a factor of the resistance
d) varies by a factor of unity
Clarification: We know that
N = 1 + RaRs
where, N is the multiplying factor
Ra is the ammeter resistance
Rs is the shunt resistance
It is clear from the above equation that in order to increase the ammeter range by N times, the shunt resistance is equivalent to 1N-1.

9. A multiplier is __________
a) non-inductive
b) resistive
c) capacitive
d) non-capacitive