Explore topic-wise MCQs in Electrical Engineering.

This section includes 28 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering knowledge and support exam preparation. Choose a topic below to get started.

1.

An accurate ammeter must have a resistance of:

A. High value
B. Low value
C. Very low value
D. Very high value
Answer» D. Very high value
Discussion
2.

An MC ammeter has a shunt of 0.2 Ω and a coil circuit resistance of R = 100 Ω. The instrument can take maximum of 5 V. Determine the maximum current the instrument can handle.

A. 25.005 A
B. 2.505 A
C. 25.05 A
D. 25.5 A
Answer» D. 25.5 A
Discussion
3.

A galvanometer with a full-scale current of 10 mA has a resistance of 1000 Ω. The multiplying power (the ratio of measured current to galvanometer current) of a 100 Ω shunt with this galvanometer is:

A. 100
B. 11
C. 10
D. 110
Answer» C. 10
Discussion
4.

In order to increase the range of measuring voltage, ______ is connected in ______ with voltmeter.

A. low resistance, parallel
B. high resistance, series
C. high resistance, parallel
D. low resistance, series
Answer» C. high resistance, parallel
Discussion
5.

How will you extend the range of measurement in case of an ammeter and voltmeter?

A. Shunt a resistance across voltmeter and inductance in series with the ammeter
B. Shunt a resistance across the ammeter and capacitance with zero resistance in series with the voltmeter
C. Shunt a resistance across the ammeter and inductance in series with the voltmeter
D. Shunt a resistance across the ammeter and high non-inductive resistance in series with the voltmeter
Answer» E.
Discussion
6.

A moving coil instrument has resistance of 5 Ω and gives a full-scale reading of 100 mA. It is desired to use this meter as a voltmeter for a range of 0 to 500 V. The resistance required is:

A. 4995 Ω in parallel
B. 5 Ω in parallel
C. 5 Ω in series
D. 4995 Ω in series
Answer» E.
Discussion
7.

A moving coil instrument of resistance 5Ω requires a potential difference of 75 mV to give a full scale deflection. The value of shunt resistance needed to give a full scale deflection at 30 A is

A. 2.5 mΩ
B. 9.99 mΩ
C. 5 Ω
D. 9.95 Ω
Answer» B. 9.99 mΩ
Discussion
8.

How to convert a (0 to 1) mA meter to measure the current in the range of 1 to 100 mA ? The internal resistance of the meter is 100 Ω.

A. Connect a 1.01 Ω resistance in series with the meter
B. Connect a 1.01 Ω resistance in parallel with the meter
C. Connect a 10.01 Ω resistance in series with the meter
D. Connect a 10.01 Ω resistance in parallel with the meter
Answer» C. Connect a 10.01 Ω resistance in series with the meter
Discussion
9.

A moving coil meter has a resistance of 3 Ω and gives full scale deflection with 30 mA. To measure voltage up to 300 V, the external resistance to be connected in connected in series with the instrument is

A. 997 Ω
B. 10000 Ω
C. 9997 Ω
D. 1003 Ω
Answer» D. 1003 Ω
Discussion
10.

For ammeter shunts. which one of the following is not a possible requirement?

A. It should have high thermal automotive force
B. It should carry current without excessive temperature rise
C. Its resistance should not vary with time
D. Its temperature coefficient must be low
Answer» B. It should carry current without excessive temperature rise
Discussion
11.

A 100 micro Amp, 3000-ohm meter movement, the shunt resistance for double the current range is ____

A. 100 ohm
B. 1,500 ohm
C. 3,000 ohm
D. 60k ohm
Answer» D. 60k ohm
Discussion
12.

A moving-coil galvanometer can be used as a DC ammeter by connecting

A. a high resistance in series with the meter
B. a high resistance across the meter
C. a low resistance across the meter
D. a low resistance in series with the meter
Answer» D. a low resistance in series with the meter
Discussion
13.

Determine the value of a shunt resistance (in Ohms) required to convert a galvanometer into an ammeter of reading up to 15 A. The internal resistance of the galvanometer is 30 Ohms and the value of current for full scale deflection is 0.3 A

A. 0.84
B. 0.74
C. 0.61
D. 0.52
Answer» D. 0.52
Discussion
14.

A galvanometer may be converted into ammeter or voltmeter. In which of the following cases the resistance of the device will be the largest?

A. an ammeter of range 10 A
B. a voltmeter of range 5 volt
C. an ammeter of range 5 A
D. a voltmeter of range 10 V
Answer» E.
Discussion
15.

A DC ammeter has a resistance of 0.1 Ω and its currents range is 0-100 A. If the range is to be extended to 0-500 A, then the shunt resistance should be:

A. 0.5 Ω
B. 0.25 Ω
C. 0.025 Ω
D. 0.05 Ω
Answer» D. 0.05 Ω
Discussion
16.

A moving coil instrument has a coil resistance of 10 ohms and it can take maximum current of 100 mA. What modification is required in the instrument to measure the voltage in the range (0 to 500) V?

A. 49.9 Ω in series with the instrument
B. 4.99 kΩ in series with the instrument
C. 4.99 Ω in series with the instrument
D. 4.99 kΩ in parallel with the instrument
Answer» C. 4.99 Ω in series with the instrument
Discussion
17.

A d’Arsonval meter of 100 Ω DC coil and 0-1 mA sensitivity gives full-scale reading of 10 A on using an external resistance of

A. 100 Ω
B. 10 Ω
C. 0.01 Ω
D. 0.001 Ω
Answer» D. 0.001 Ω
Discussion
18.

A voltmeter must have very high internal resistance so that

A. Accuracy is high
B. Resolution is high
C. Draws small amount of current
D. Creates high loading effect of the circuit
Answer» D. Creates high loading effect of the circuit
Discussion
19.

An MC instrument with internal equivalent resistance of 10 Ω, takes 40 mA to produce full-scale deflection. How do you convert that instrument to measure the current from 0 A to 2 A?

A. By connecting 0.2041 Ω resistance in series with the instrument
B. By connecting 0.4082 Ω resistance in parallel with the instrument
C. By connecting 0.4082 Ω resistance in series with the instrument
D. By connecting 0.2041 Ω resistance in parallel with the instrument
Answer» E.
Discussion
20.

A 10 mA ammeter having 100 ohm resistance, is used to measure up to 1 A. The required shunt resistance is approximately

A. 1 Ω
B. 12 Ω
C. 50 Ω
D. 100 Ω
Answer» B. 12 Ω
Discussion
21.

A moving coil instrument having meter resistance of 5 Ω is to be used as a voltmeter of range 0 – 100 V. If the full scale deflection current is 10 mA, then find the required series resistance.

A. 1999
B. 10000
C. 995
D. 9995
Answer» E.
Discussion
22.

A 10 mA meter having an internal resistance of 100 Ohms is to be converted to (0 – 200) mA ammeter. What value of shunt resistance (in ohms) is required?

A. 5.26
B. 5
C. 10.52
D. 10
Answer» B. 5
Discussion
23.

A (0 a to 50 A) moving coil ammeter has voltage drop of 0.1 V across its terminals at full scale deflection. The external shunt resistance (in milliohms) needed to extend its range to 0 A to 500 A is.

A. 22.2 mΩ
B. 2.2 mΩ
C. 0.22 mΩ
D. 222.2 mΩ
Answer» D. 222.2 mΩ
Discussion
24.

A 100 μA ammeter has an internal resistance of 100 Ω. For extending its range to measure 500 μA, the shunt required is of resistance (in Ω)

A. 20.0
B. 22.22
C. 25.0
D. 50.0
Answer» D. 50.0
Discussion
25.

A moving-coil instrument has a resistance of 10 Ω and gives a full-scale deflection when carrying a current of 50 mA. What external resistance should be connected so that the instrument can be used to measure current up to 50 A?

A. 20 Ω in parallel
B. 100 Ω in series
C. 0.010 Ω in parallel
D. 18.7 Ω in series
Answer» D. 18.7 Ω in series
Discussion
26.

A basic D’ Arsonval movement showing full-scale deflection for a current of 50 μA and having an internal resistance of 500 Ω is used as a voltmeter. What is the value of multiplier resistance needed to measure a voltage range of 0 – 20 V?

A. 398.5 kΩ
B. 399 kΩ
C. 399.5 kΩ
D. 400 kΩ
Answer» D. 400 kΩ
Discussion
27.

A moving coil gives the full scale deflection with 15 mA and has a resistance of 5 Ω. The value of the resistance in parallel to enable the instrument to read up to 1 A.

A. 0.00076 Ω
B. 0.076 Ω
C. 1.76 Ω
D. 0.0076 Ω
Answer» C. 1.76 Ω
Discussion
28.

Extension of moving iron ammeter range can be done by using

A. Inductor
B. Shunt
C. Multiplier
D. Capacitor
Answer» C. Multiplier
Discussion