(a) 5MHz sweep

(b) 10MHz vertical oscillator

(c) 10MHz horizontal oscillator

(d) 10MHz supply frequency

Answer

[2] Which of the following instruments can be used to measure AC current only?

(a) Permanent Magnet Type ammeter

(b) Induction type ammeter

(c) Moving iron voltmeter

(d) Moving iron ammeter

Answers:

1. D only

2. B only

3. A, B, D

4. B and D only

Answer

[3] An oscilloscope indicates

(a) Peak to peak value of voltage

(b) DC value of voltage

(c) RMS value

(d) Average value

Answer

[4] In a ballistic galvanometer, the deflecting torque is proportional to

(a) the current through coil

(b) square of current through coil

(c) square-root of current through coil

(d) sine of measured

Answer

[5] The error of an instrument is normally given as a percentage of

(a) measured value

(b) full-scale value

(c) mean value

(d) rms value

Answer

[6] If the instrument is to have a wide range, the instrument should have

(a) Linear scale

(b) Square-law scale

(c) Exponential scale

(d) Logarithmic scale

Answer

[7] The resistance can be measured most accurately by

(a) Voltmeter-ammeter method

(b) bridge method

(c) multimeter

(d) Megger

Answer

[8] The repeat accuracy of an instrument can be judged from its

(a) static error

(b) linearity error

(c) dynamic error

(d) standard deviation of error

Answer

[9] Which of the following meters has a linear scale?

(a) Thermocouple meter

(b) Moving iron meter

(c) Hot wore meter

(d) Moving coil meter

Answer

[10] No eddy current and hysteresis losses occur in

(a) Electrostatic instruments

(b) PMMC instruments

(c) Moving iron instruments

(d) Electrodynamo meter instruments

Answer

[11] Two voltmeters have the same range 0-400V. The internal impedance

are 30,000 Ohms and 20,000 Ohms. If they are connected in series and

600V be applied across them, the readings are

(a) 360V and 240V

(b) 300V each

(c) 400V and 200V

(d) one of the meters out of the range and other 100V

Answer

[12] The full-scale deflection current of an ammeter is 1 mA and its

internal resistance is 100Ohm. If this meter is to have full deflection

at 5A, what is the value of the shunt resistance to be used?

(a) 49.99 Ohms

(b) 1/49.99 ohms

(c) 1 Ohm

(d) 2 Ohms

Answer

[13] The full-scale deflection current of an ammeter is 1 mA and

its internal resistance is 100Ohm. This is to have full deflection when

100V is measured. What is the value of series resistor to be used?

(a) 99.99 K ohms

(b) 100 K ohms

(c) 99.99 ohms

(d) 100 ohms

Answer

[14] Why is a MISC meter not recommended for DC measurement?

(a) The meter is calibrated for AC and it’s error for DC would be high

(b) The meter does not respond to DC signals

(c) The error is high due to hysteresis effect

(d) The error is high due to eddy current effect

Answer

[15] The EMF of Weston standard cell is measured using

(a) Moving- iron meter

(b) Moving-coil meter

(c) Digital Volt meter

(d) Potentiometer

Answer