11) A variable reluctance type tachometer has 60 rotor teeth, the records 3600 counts/minutes. The device speed is
a) 60 r.p.s
b) 1800 r.p.s
c) 3600 r.p.s
d) 7200 r.p.s
12) The gauge factor of the material of strain gauge is such that the resistance changes from 1000 ohms to 1009 ohms when subjected to a strain of 0.0015. The poisson’s ratio for the material of the gauge wire is
a) 1.75
b) 2
c) 2.5
d) 6
13) Which of the following phenomena is most important when foodstuff is cooked in a microwave oven ?
a) Resistive Joule heating
b) Induction heating
c) Dielectric heating
d) Radiation heating
14) According to Gaussian statistical analysis, if the confidence level is 0.80, then the values lying outside the confidence interval are
a) 1 in 5
b) 1 in 10
c) 1 in 20
d) 8 in 10
15) Very small displacements are effectively measured using
a) LVDT
b) Strain gauge
c) Thermistor
d) Tachogenerator
16) Damping torque in the disc of an a.c. energy meter is provided by which one of the following ?
a) Electrostatic effect
b) Magnetostatic effect
c) Eddy current effect
d) Chemical effect
17) Which one of the following types of landline telemetry method has the advantage of simplicity and is free from noise, leakage and supply voltage variations ?
a) Current type
b) Voltage type
c) Position type
d) Impulse type
18) Creep error is associated with which one of the following meters ?
a) Moving iron meter
b) Energy meter
c) Electrodynamic meter
d) Wattmeter
19) Which one of the following in simple elemental forms is not a pressure sensor ?
a) Cantilever beam
b) Bourden tube
c) Diaphragm
d) Bellows
20) Which of the following meters does not exhibit square law response ?
a) Moving coil
b)Moving iron
c) Electrodynamometer
d) Hot wire instrument