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Measurements And Instrumentation Online Exam Quiz

Important questions about Measurements And Instrumentation. Measurements And Instrumentation MCQ questions with answers. Measurements And Instrumentation exam questions and answers for students and interviews.

2. A moving coil instrument has a resistance of 0.5 ? and a full scale deflection of 0.1 A. To convert it into an ammeter of 0-10 A the shunt resistance should be

Options

A : 0.004 ?

B : 0.005 ?

C : 0.05 ?

D : 0.1 ?

3. As per BIS there are 6 accuracy classes of instruments.

Options

A : True

B : False

C :

D :

4. A piezoelectric force transducer has a charge sensitivity of 20 pC/N. It is connected to a charge amplifier and overall gain of transducer and amplifier is 50 mV/N. The gain of amplifier is

Options

A : 1 mV/pC

B : 1.5 mV/pC

C : 2.5 mV/pC

D : 4 mV/pC

5. An ammeter of 0-25 A range has a guaranteed accuracy of 1% of full scale reading. The current measured is 5 A. The limiting error is

Options

A : 2%

B : 2.5%

C : 4%

D : 5%

6. An LVDT is used to measure displacement. The LVDT feeds a Voltmeter of 0-5 V range through a 250 gain amplifier. For a displacement 0.5 mm the output of LVDT is 2 mV. The sensitivity of instrument is

Options

A : 0.1 V/mm

B : 0.5 V/mm

C : 1 V/mm

D : 5 V/mm

7. In two wattmeter method of 3 phase power measurement, when does one wattmeter read negative

Options

A : when power factor is less than 0.5 lagging

B : when power factor is greater than 0.5 lagging

C : when power factor is less than 0.5

D : when power factor is unity

8. The household energy meter is

Options

A : indicating instrument

B : recording instrument

C : integrating instrument

D : none of the above

9. Induction wattmeter can be used in

Options

A : ac circuit only

B : dc circuit only

C : both ac and dc circuit

D : ac 3 phase only

10. A standard cell of 1.0185 V is used with a slide wire potentiometer. The balance was obtained at 60 cm. When an unknown emf was connected, the balance was obtained at 82 cm. The magnitude of unknown emf is

Options

A : 1.39 V

B : 0.75 V

C : 13.9 V

D : 7.45 V

1. To increase Q factor of a coil, the wire should be

Options

A : long

B : thin

C : thick

D : long and thin

2. The Lissajous pattern observed on screen of CRO is a straight line inclined at 45° to x axis. If X -plate input is 2 sin ? t , the Y -plate input is

Options

A : 2 sin ? t

B : 2 sin (? t + 45°)

C : 2 sin (? t - 45°)

D : 2 2 sin ? t + 45°)

3. The angle ? for a mica capacitor is about

Options

A : 25°

B : 15°

C : 5°

D : 1°

4. A voltmeter using thermocouples measures

Options

A : rms value

B : peak value

C : average value

D : peak to peak value

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

Options

A : Power can be measured by this method only for star connected loads

B : When two wattmeters have equal readings power factor is 0.5.

C : When power factor is 1, one of the wattmeters readings is zero

D : When the two wattmeter read equal and opposite, p.f. is zero.

6. In a CRO which of the following is not a part of electron gun

Options

A : cathode

B : grid

C : accelerating anode

D : X - Y plates

7. The coil of a moving iron instrument has a resistance of 500 ? and an inductance of 1 H. It reads 250 V when a 250 V dc is applied. If series resistance is 2000 ?, its reading when fed by 250 V, 50 Hz ac will be

Options

A : 260 V

B : 252 V

C : 250 V

D : 248 V

8. In a ballistic galvanometer, a charge of 100 ?C gives a first swing of 25°. The charge required to cause first swing of 50° is

Options

A : 200 ?C

B : 400 ?C

C : 50 ?C

D : 25 ?C

9. In a strain measuring device using a strain gauge, the output quantity is

Options

A : voltage

B : resistance

C : impedance

D : either (a) or (b)

10. Magnetic flux density has the dimensions

Options

A : MI -1 T -2

B : M -1 I -2 T -2

C : ML -3 T -2

D : MI -1 T -3

1. A dynamometer wattmeter is connected in ac circuit. The measured power is

Options

A : rms power

B : average power

C : peak power

D : instantaneous power

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