Q.1.The main scale of a vernier calliper is ruled in 1 mm units.The vernier scale is 49 mm long and divided in 50 units. The resolution of the vernier calliper is
0.002 mm
0.005 mm
0.01 mm
0.02 mm
Q.2.A frequency counter with a gating time of 50 ms counts 1254 cycles of an input square wave. The frequency of the input wave is
39.87 Hz
62.70 Hz
1.254 kHz
25.08 kHz
Q.3.A data acquisition system with the input range of ± 5.0 V has a 12-bit ADC in it.The resolution of the system is approximately
0.24 mV
0.48 mV
1.22 mV
2.44 mV
Q.4.Watt meters are based on the principle of
permanent magnet moving coil meter
electrodynamic meter
electrostatic meter
moving iron meter
Q.5.The resolution of a Gray-coded optical shaft encoder with 10-bit output is approximately
0.098°
0.176°
0.225°
0.352°
Q.6.The unit of the permittivity of free space (E0) is
C2 N–1 m–2
C2 N m2
C–2 N m2
C–2 N m–1
Q.7.A positively charged object is placed in the center of a room with a uniform magnetic field. If the magnetic field is pointing east, the object will
move east
move north
move south
remain stationary
Q.8.The input impedance of a quarter-wave long short-circuited lossless transmission line is
purely reactive
purely resistive
infinite
dependent on the characteristic impedance of the line
Q.9.For a plane wave propagating in the free space,
the electric and magnetic fields are in parallel to the direction of propagation there is no field in the direction of propagation
the electric and magnetic fields are out of phase
the magnetic field amplitude is inversely proportional to the electric field amplitude
None of these
Q.10.Which of the following materials has the largest energy gap between the conduction band and the valence band?
Gold
Silicon
Doped germanium
Porcelain
Q.11.The area of hysteresis loop in a ferromagnetic material is a measure of
loss of energy
loss of magnetic domain
loss of magnetic dipole
loss of eddy currents
Q.12.If a tetra- valent impurity is added to a pure silicon crystal at room temperature, it becomes
a p-type semiconductor
an n-type semiconductor
an npn-type semiconductor.
an insulator
Q.13.Unregulated dc power supply is not in need of
Diode
Transformer,
Zener diode
filter
Q.14.The eigen values of a skew-symmetric matrix are
always zero
always pure imaginary
either zero or pure imaginary
always real
Q.15.At room temperature, a possible value for the mobility of electrons in the inversion layer of a silicon n-channel MOSFET is
450 cm2/V-s
1350 cm2/V-s
1800 cm2/V-s
3600 cm2/V-s
Q.16.For parallel RLC circuit, which one of the following statements is NOT correct?
The bandwidth of the circuit deceases if R is increased
The bandwidth of the circuit remains same if L is increased
At resonance, input impedance is a real quantity
At resonance, the magnitude of input impedance attains its minimum value.
Q.17.Q-meter works on the principle of
series resonance
parallel resonance
mutual inductance
self inductance
Q.18.Which one of the following is a ceramicinsulator?
Mica
Porcelain
Liquid crystal
Synthetic fiber
Q.19.Which one of the following represents a directband-gap material?
Si
Ge
GaP
GaAs
Q.20.Which one of the following statements is NOTtrue?
Rochelle salt exhibits ferroelectricproperty.
Spontaneous polarization is acharacteristic property of ferroelectricmaterial.
Spontaneous polarization of ferroelectricmaterials usually vanishes belowferroelectric Curie temperature.
Ferroelectric materials exhibit hysteresiseffect.
Q.21.Which one of the following diodes contains ametal-semiconductor junction?
Tunnel diode
Zener diode
Schottky diode
Gunn diode
Q.22.The most appropriate value (in Ohm) of theradiation resistance of a quarter wavemonopole antenna is
36.5
50
73
120
Q.23.Which one of the following is an activetransducer?
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