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Marks scored Examiners

Signature

BIRLA INSTITUTE OF TECHNOLOGY & SCIENCE-PILANI, HYDERABAD CAMPUS

II SEM. 2011 – 2012

TA C222 (MEASUREMENT TECH-2) March-01, 2012 (Thurs day) 6 to 6:50 PM

Max. Marks: 40 EEE - Quiz Test (Closed Book) Duration: 50 minutes

Note: (i) Q1 to Q20 are multiple choice questions, Cross the box of your choice to the question in the answer

sheet given on the back page.

(ii) Q 21 to Q37 Write one word answer in the answer sheet given on the back page.

(iii) Q 38 to 40 writes proper description or show with sketch.

(iv) Overwritten answers in the boxes shall be treated as invalid answer. No negative marks.

1. For a balanced 3-phase, 3- wire WYE network,

line voltage is given as 208V. What will be the

phase voltage for the given configuration?

A) 360V B) 208V C) 120V D) 440V

2. Relationship between line and phase voltages in

DELTA network is

A) √3

B) √3

C) √2

D)

3. What are total losses that occur in transformer?

A) Hysteresis losses & eddy current losses

B) Core losses & copper losses

C) Stray load losses & copper losses

D) Eddy current losses & copper losses

4. Power factor for purely reactive circuits is

A) Unity B) 0 C) Infinite

D) Data Insufficient

5. For a series RC circuit, equivalent voltage Phasor

will be in which quadrant? (Taking voltage across

resistor as X-axis).

A) Ist B) II

nd C) III

rd D) IV

th.

6. The principle of operation of LVDT is based on

the variation of

A) Mutual inductance B) Reluctance

C) Self-inductance D) Permanence

7. While measuring power in three phase circuits in

two wattmeter method, what will be multiplication

factor of the wattmeters?

A) 2 B) 4 C) 6 D) 8

8. Linear voltage differential transformer converts

A) Linear Displacement to electrical signal

B) Angular Displacement to electrical signal

C) Electrical Signal to linear displacement

D) Electrical signal to angular displacement

9. What is the purpose of voltage regulation in a

transformer?

A) Maintain voltage with in prescribed limits

B) Control the power consumption

C) Control power theft

D) All of these

10. The phase difference between secondary coils of

LVDT transformer is

A) 00 B) 45

0 C) 90

0 D) 180

0

11. Single phase induction motors are not self-starting

because

A) The magnitude of the flux produced in the

stator is low

B) No voltage is induced in the rotor circuit

C) There is no relative motion between stator

and rotor magnetic fields

D) None of these

Name: ID No.: PS No

Set -A

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12. A single phase induction motor will be started if

A) It is suddenly switched on

B) A starter is used

C) There is no mechanical load

D) Starting winding is disconnected

13. Removing bypass capacitor across the emitter-leg

resistor in a CE amplifier causes

A) Increase in current gain.

B) Decrease in current gain.

C) Increase in voltage gain.

D) Decrease in voltage gain.

14. The region of operation for the transistor shown in

the circuit below.

A) Saturation.

B) Reverse Active.

C) Forward Active.

D) Cutoff.

15. The diode in the circuit shown below is ideal. The

input waveform is seen adjacent to the circuit. The

output waveform would look like

A) B)

C) D)

16. The breakdown mechanism in a lightly doped p-n

junction under reverse biased condition is called

A) Avalanche breakdown.

B) Zener breakdown.

C) Breakdown by tunneling.

D) High voltage breakdown.

17. If Input to digital circuit shown below is X then

the Output Y is given by

A) 0 B) C) 1 D)

18. Consider the digital circuit shown below with P,

Q and R as inputs and Y as output.

When R=1, this circuit behaves as 2 input

(i)______ Gate (with P,Q as inputs and Y as

Output) and When R=0, this circuit behaves as 2

input (ii) ______Gate (with P,Q as inputs and Y

as Output)

A) (i) NAND (ii) NOR

B) (i) AND (ii) NOR

C) (i) AND (ii) OR

D) (i)NAND (ii) OR

19. Match the Logic gates in column A with their

equivalents in Column B

A) P-2, Q-3, R-1 B) P-3, Q-2, R-1

C) P-1, Q-3, R-2 D) P-1, Q-2, R-3

20. For the circuit shown below. Which of the

following Boolean expression correctly represents

the relation between P, Q, R and M?

A) M = (P OR Q) XOR R

B) M = (P AND Q) XOR R

C) M = (P NOR Q) XOR R

D) M = (P XOR Q) XOR R

[P T O

+ _ 6V

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21. In 2-wattmeter unbalanced load experiment,

voltmeter measures voltage.

22. Ratio of ________ power and _________ power

gives power factor.

23. In open circuit test transformer winding

is open circuited.

24. In short circuit test auto transformer is varied till

_________ is achieved.

25. For speed control below rated speed in DC Motor

______ control method is suitable.

26. Initially DC shunt motor is rotating in clock wise

direction, if supply terminals are interchanged DC

shunt motor will rotate in _____________

direction.

27. In DC shunt motor Commutator acts as ________

28. Among transformer and induction motor which

one is efficient?

29. The biasing technique used in the lab to bias the

NPN transistor in CE amplifier is _____________

30. For the circuit shown in below Fig: P30, VBE = 0.7V and β = 49. Find the value of ICQ

Fig : P30 Fig: P31

31. The RMS value of the sinusoidal signal shown in

the Fig: P31 with a amplitude scale of 1 V/ Div is

equal to ___________

32. The voltage across the diode, below which current

is very small (less than1% of rated current) in the

forward biased condition is called________

33. An ideal operational amplifier has _________

input impedance and output impedance.

34. The channel 1 (X) of CRO is connected to a

signal source A which has a frequency of 12 kHz.

When channel 2(Y) of CRO is connected to a

signal source B and the display mode is changed

to X-Y, the Lissajous pattern appears as shown in

Fig: P33. The frequency of signal source B is

_____________

Fig: P33 Fig: P34

35. The channel 1(X) and channel 2(Y) of CRO are

connected to input and output of a simple RC

circuit. When the display mode is changed to X-

Y, the Lissajous pattern appears as shown in Fig :

P34. The phase difference between input and

output is ___________

36. An operational amplifier working in inverting

mode has value of feedback resistance (RF) =

2.2K Ώ and input resistance (Rin) =220 Ώ the

voltage gain is .

37. If the color coding of resistor is as follows:

First color = yellow, Second color = violet

Third color = Red;

The value of resistance offered is _____

38. What is the role of transformer in the

measurement of unregulated D.C power supply?

39. Sketch the output waveform for circuit shown in

figure below.

40. What is the use of Commutator in Induction

motor?

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ANSWER SHEET Note: The correct way to answer question 1 to 20 is to put

the cross mark in the right choice box as shown below.

Q. A B C D

Q1. A B C D

Q2. A B C D

Q3. A B C D

Q4. A B C D

Q5. A B C D

Q6. A B C D

Q7. A B C D

Q8. A B C D

Q9. A B C D

Q10. A B C D

Q11. A B C D

Q12. A B C D

Q13. A B C D

Q14. A B C D

Q15. A B C D

Q16. A B C D

Q17. A B C D

Q18. A B C D

Q19. A B C D

Q20. A B C D

Q21. Line Voltage

Q22. Active , Apparent

Q23. High Voltage (HV)

Q24. Rated Current

Q25. Below

Q26. Clockwise

Q27. Rectifier

Q28. Transformer

Q29. Self/ Voltage divider bias

Q30. 7.595mA

Q31. √2 = 1.414

Q32. Cut in / Threshold Voltage

Q33. Infinite, Zero

Q34. 18 KHZ

Q35. 45.06°

Q36. -10

Q37. 4.7 KΩ

Q38. Stepping down Input AC Voltage

/ Step down

Q39.

Q40. No Use of commutator