Measurements and Instrumentation

26

Assertion (A): A photovoltaic cell is greatly affected by temperature.

Reason (R): Both germanium and silicon can be used for photovoltaic cells.

A. Both A and R are true and R is correct explanation of A
B. Both A and R are true but R is not correct explanation of A
C. A is true R is false
D. A is false R is true

27

The method of frequency compensation in moving iron voltmeter is

A. to use a capacitor in series with coil
B. to connect a capacitor in parallel with coil
C. to connect a capacitor in parallel with series resistance
D. none of the above

28

A dynamometer wattmeter is suitable for both dc and ac.

A. True
B. False

29

In measurements using CRO, Lissajous patterns are used to

A. measure magnitude of peak voltage
B. measure frequency
C. measure impedance
D. measure current

30

If the load current is high, the pressure coil of wattmeter should be connected directly across the load.

A. True
B. False