
Problem 
Answer 
1 
A millivoltmeter with a range of 0 to 50 is to be used with a 400amp, 50millivolt shunt. What will be the constant for this combination? 

2 
What is the resistance of a 50millivolt shunt rated at 10 amp? 

3 
A directreading 5amp, 100volt wattmeter is used with a potential transformer of 20:1 ratio and a current transformer of ,50:5 ratio. By what constant must the reading be multiplied? 

4 
Give complete instructions for proving the correctness of connections of a polyphase wattmeter, using both current and potential transformers, when measuring a balanced threephase threewire load. 

5 
A 50millivolt meter draws 1 milliampere for every 5 millivolts impressed on it. How many ohms in series must be added to cause the meter to read full scale on 150 volts? 

6 
A voltmeter with a resistance of 15,000 ohms draws 10 milliamperes with full scale deflection. How could this meter be converted to a satisfactory milliammeter with 10 milliamperes full scale? 

7 
It is required to measure a dc voltage of about 700 volts. A 600volt meter and a 150volt meter are available. Is it permissible to use these meters in series and to add their readings? Explain. 

8 
In using an ammeter and a wattmeter in the secondary circuit of a current transformer, why must the current coils be connected in series? 

9 
In using a voltmeter and a wattmeter in the secondary circuit of a potential transformer, why must the potential coils be connected in parallel? 
