TANCET2006(Q11toQ20)

11. Match the following instruments with the corresponding quantities that can be measured
(P) Manometer      (i)   Pressure
(Q) Rotameter       (ii)  Viscosity
(R) Membrane       (iii) Flow rate
(S) Capillary tube   (iv) Level

A) (P)-(i), (Q)-(ii), (R)-(iii), (S)-(iv)
B) (P)-(iv), (Q)-(iii), (R)-(i), (S)-(ii)
C) (P)-(iii), (Q)-(i), (R)-(iv), (S)-(ii)
D) (P)-(ii), (Q)-(iv), (R)-(i), (S)-(iii)

12. A thermometer at room temperature of 28⁰C is suddenly immersed in a steaming waterbath. The time constant of the thermometer, if it takes 30 seconds to show a reading of 96.4⁰C
A) 2.5 s
B) 5 s
C) 6 s
D) 10 s

13.3-input logic gate has inputs : X=0, Y=1 and Z=1. If its output W=1, the gate would be
(i)  NOR
(ii) OR
(iii) AND

A) (i) alone
B) (ii) alone
C) (iii) alone
D) (i) and (iii) alone

14. In an experiment, three observations of pressure are 10.02 kPa, 10.20 kPa and 10.26 kPa. The standard deviation of the reading is
A) 0.3083
B) 0.883
C) 0.0883
D) 0.0383

15. A pitot static tube is used to measure the air flow rate in a square tube. If P_d is the differential pressure, the flow rate is proportional to
A) P_d²
B) 1/√P_d
C) P_d
D) √P_d

16. A thyristor is turned off when the anode current is less than
A) Holding current
B) Latching Current
C) Gate current
D) Peak Current

17. The transfer function of a measuring instrument is given by (e^-1.5s)/(1+0.5s).
The output of the instrument after 2 seconds for a unit step input is
A) 0.632
B) 0.623
C) 0.362
D) 0.236

18. Surge current rating of an SCR specifies the maximum non-repetitive current with
A) impulse wave
B) rectangular wave
C) sine wave
D) triangular wave

19. A 2.5 volts 500 Hz voltage frequency modulates the carrier to cause frequency deviation of 5 kHz. The modulation index is
A) 10
B) 25
C) 5
D) 50

20. Over current protection of SCR may be done by
A) Semi-conductor fuse
B) HRC fuse
C) snubber circuit
D) crow bar protection

Answer:-    11)A    12)A    13)B    14)B    15)C    16)A    17)B    18)A    19)A    20)C