Janardan Rai Nagar Rajasthan Vidyapeeth 2006 B.Tech Electrical and Electronics Engineering ELECTRICAL MEASUREMENT – I - Question Paper
JRN Rajasthan Vidyapeeth University
ELECTRICAL ENGINEERING
SEMESTER 4
ELECTRICAL MEASUREMENT – I
Model Question Paper
BSE10/BSET10- ELECTRICAL MEASUREMENT I
Duration : 3 hrs Maximum Marks: 75
Instruction:
- Question paper is divided into Group A, Group B, and Group C
- Each Group is of 25 marks
- Figure to the right in bracket indicate marks.
- Good Handwriting is expected.
Group A (25 Marks)
Answer any three questions (Question 1 is compulsory)
Q.1 Explain the units of measurement Briefly describe the CGS and and MKS system of Unit
(5)
Q.2 (a) Describe the Ammeter Voltmeter method of Resistance measurement (10)
(b) How do you measure the electrical quantity by using a potentiometer.
Q.3 (a) Explain with circuit diagram maxwells inductance capacitance bridge (10)
(b) what do you understand by Pmmc type instruments. Give the construction of Pmmc type instrument
Q.4 Draw current transformer circuit diagram and . Drive the relationship in a current transformer. (10)
Q.5 What do mean by Resistance strain gauge Transducer. Drive the expression for strain gauge Transducer. (10)
Group B (25 Marks)
Answer any three questions (Question 6 is compulsory)
Q.6 Drive the relation between electrostatic and Electromagnetic units. (5)
Q.7 Describe the basic principle of a d.c. potentiometer. Explain the term standardization of a potentiometer. Describe the procedure of standardization of a d.c. potentiometer. Draw the circuit diagram of a Comptons potentiometer and explain its working
Q.8 A Wheat stone bridge has ratio arms of 1000 Ω and 100 Ω and is being used to measure an unknown resistance of 25 Ω. Two galvanometers are available. Galvanometer A has a resistance of 50 Ω and a sensitivity of 200mm/ A and galvanometer B has values of 600 Ω and 500mm/A . Which of the two galvanometer more is sensitive to a small unbalance on the above bridge and what is the ration of sensitivities. The galvanometers is connected form the junction of the ration arms to the opposite corner comment upon the results. (10)
Q.9 A basic slide potentiometer has a working battery voltage of 3V with negligible internal resistance. The resistance of slide wire is 400Ω and its length in 200Cm. A 200Cm scale in placed along the slide wives. The slide wire has 1mm scale divisions and it is possible to read up to 1/5 of a division. The instrument is standardized with 1.018V standard cell with sliding. Contact a the 101.8 Cm mark on scale. Calculate (a) working current (b) the resistance of series rheostate. (C) the measurement range and (D) resolution of instrument. (10)
Q.10 A shee of bakelite 4.5mm thick is tested at 50HZ between electrodes 0.12m in diameter. The schering bridge employs a standard aiv capacitor C2 of 106f capacitance, a non-reactive resistance R4 of 1000/pohm is parallel with a variable capacitor C4, and a non-reactive resistance R3.Balance is obtained with C4=0.5f and R2 = 260Ω.Calculate the capacitance power factor and relative permitivity of sheet. (10)
Group C (25 Marks)
All questions are compulsory.
Q. 11. Fill in the blanks (Each question carries 2 marks, Total = 10 marks)
1. The base units in SI system are , metro kilograms, second, ampere, Kelvin, candela _____________
2. The ______________ dimensions of resistance CGS emu System.
3. ____________ used as a electrostatic types instruments.
4. A wheat stone bridge cannot be used for precision measurements because errors are introduced into on account of._______________
5. Standardization of potentiometers is done in order that, they become
Q. 12. Multiple choice questions (Each question carries 2 marks, Total = 10 marks)
Select the correct answer.
(1) Frequency can be measured by using
(a)Max wells bridge (b) Scheming bridge (c) Heavyset comp bell bridge (d) Wein bridge .
(2) A linear displacement transducer (digital) normally used
(a) Straight binary code(b) BCD (c) Gray code (d) Hexadecimal code .
(3) A Potentiometer is basically a
(a) Depletion type instrument (b) null type instrument (c) Depletion as well as null type instrument (d) A digital instrument.
(4) The unit of surface tension is
(a) V/t (b)W/t (c)m/t (D) f/t.
(5) The dimensions of power.
(a)ML2T-3 (b) ML2T3 (c) ML2T-2 (d) ML2T2.
Q. 13. Indicate whether following statements are True or False (Each question carries 1 marks, Total = 5 marks)
1. The unit of energy is joule.
2. The relation between esu and emu is Σ =1/√V , =Relative permeability ∑ =Permitivity.
3. 1 farad = 91011 e. s units of capacitance.
4. The frequency for wien bridge. F=1/2RL
5. From the point up view of Safety, the resistance of eathing electrode should be low.
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| Earning: Approval pending. |
