Q. Potentiometer method of dc voltage measurement is more accurate than direct measurement using a voltmeter because

View solution

Q. Assertion (A): A hot wire ammeter has a cramped scale.

Reason (R): The heat is proportional to square of current.

View solution

Q. Which of the following is true about an impulse voltage?

View solution

Q. Which of the following are needed both for protection and metering?

View solution

Q. A digital frequency counter can be converted to DVM by addition of a suitable

View solution

Q. A dynamometer wattmeter is connected in ac circuit. The reading will be

View solution

Q. The speed transducer using a drag cup rotor has the main advantage of

View solution

Q. A voltmeter using thermocouples measures

View solution

Q. Which of the following measurements using a dc potentiometer do not require standardisation of potentiometer?

View solution

Q. Which of the following statement is correct for two wattmeters method of power measurement in 3 phase circuit?

View solution

Q. In a thermocouple temperature transducer, the output voltage is usually measured by

View solution

Q. A moving iron instrument gives correct reading when used at

View solution

Q. Induction wattmeter can be used in

View solution

Q. A meter has a square law scale. For 2 A current the deflection in 90°. For a deflection of 45°, the current is

View solution

Q. Consider the following Statements regarding resistance strain gauge

1. The gauge factor is in the range of 2 to 5.
2. The resistance changes due to change in specific resistance with strain.
3. The resistance increases with increase in temperature.

Of the above statements, which are correct?

View solution

Q. PCM employing 4 bit code is used to send data having frequency range from 0 to 2 kHz. The minimum required bandwidth of carrier channel is

View solution

Q. A sinusoidal ac voltage of amplitude 100 V is applied to a rectifying device which offers 10 Ω resistance in forward direction and infinite resistance in reverse direction. The reading on hot wire ammeter will be

View solution

Q. When a capacitor is connected to the terminals of an ohmmeter, the pointer indicated a low resistance initially and finally come to infinity position. This shows that capacitor is

View solution

Q. Consider the following operation in respect of Wheatstone bridge (Kb, denotes battery key, Kg denotes galvanometer key)

1. open Kb
2. close Kg
3. close Kb
4. open Kg

The correct sequence of operations is

View solution

Q. Two voltmeters 0-250 V each having resistances of 5 kΩ and 10 kΩ respectively and are connected in series. To ensure that neither of them goes beyond scale the total voltage which can be applied should be less than

View solution