Rajasthan Junior Instructor Wireman 2019 Paper

RSMSSB Junior Instructor Wireman 2019 Paper
Exam Date – 24th Dec 2019 Duration – 3 hours

In which region a transistor acts as an open switch?
(a) Inverted region
(b) Active region
(c) Cut off region
(d) Saturated region

If firing angle is increased, then the average output of an SCR –
(a) Remains unchanged
(b) Is increased
(c) Is decreased
(d) Changes in polarity

A Silicon Controlled Rectifier (SCR) has
(a) Four layers and three junctions
(b) Three layers and two junctions
(c) Five layers and four junctions
(d) Two layers and one junction

Ripple factor is define as
(a) r.m.s of a.c. component/ d.c. component
(b) d.c. component/ r.m.s. of a.c. component
(c) peak value of a.c/r.m.s. of a.c. component
(d) peak value of a.c./d.c. component

Zener diode uses as
(a) Rectifier
(b) Voltage divider
(c) Regulator
(d) Filter

The forward voltage drop across a diode is about
(a) 2.5 V
(b) 3.0 V
(c) 10.0 V
(d) 0.7 V

A power factor meter has
(a) One current coil and two potential coils
(b) One current coil and one potential coil
(c) Two current coils and one potential coil
(d) Two current coils and two potential coils

If a voltmeter is connected in series with the load then
(a) The measurement reading will be too high
(b) Almost no current will flow in the circuit
(c) The meter will burn out
(d) High current will flow

Moving parts of measuring instruments are supported in
(a) Bush bearings
(b) Ball bearings
(c) Roller bearings
(d) Jewelled bearings

In which types of instruments, air friction damping is used?
(a) Moving iron
(b) Moving coil
(c) Induction
(d) Hot wire

Unit for electric field strength is
(a) Volt/meter
(b) Farad/meter
(c) Weber
(d) Hertz

The PMMC meter can measure
(a) Only AC quantities
(b) Only DC quantities
(c) Both AC and DC quantities
(d) Only very high frequency quantities

The internal resistance of the ammeter should ideally be
(a) Very large
(b) Zero
(c) Infinite
(d) Very small

Meggar is used for
(a) Testing EMF
(b) Testing temperature
(c) Testing insulation resistance
(d) Bridge balancing

Argon gas is filled in filament lamp to
(a) Reduce the glare of light
(b) Improve the efficiency
(c) Change the colour of light
(d) Retard the evaporation of tungsten filament