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21st November 2017, 12:14 PM
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Join Date: Aug 2012
Re: Model Question Papers For RRB Junior Engineer Signal

As you Asking for the Question Paper of the Junior Engineer Electrical Signal Processing Recruitment Exam of the RRB the Question paper is given below

Resistance of the diode is decreased when
a. Forward biased
b. Reverse biased
c. Both forward and reverse biased
d. Either

. In earlier time is used for voltage regulation.
a. Diode
b. Transistors
c. Vacuum tubes and glow bulbs

is the equipment used during power failure.
a. Rectifier
b. Voltage regulators
c. UPS

. Peak factor of the sine wave is equal to
(a) 0.901
(b) 1.414
(c) 1.1
(d) 1.11

. The frequency of DC current
(a) Equal to voltage magnitude
(b) 0
(c) Double of AC frequency
(d) 50 HZ

The current flowing in a purely inductive circuit of 30 mH on application of 230 V, 50 Hz single phase supply is 24.4 A. If the frequency of the applied voltage is increased to 100 Hz the current flowing in the same circuit will be
(a) 24.4 A
(b) 48.8 A
(c) 12.2 A
(d) 6.1 A

Find the total resistance when two 3 Ohm resistances are connected in parallel.
(a) 1.11 ohms
(b) 1.5 ohms
(c) 0.707 ohms
(d) 1.23 ohms

Voltage drop in a resistance given by
(a) mmf/reluctance
(b) IR
(c) I/R
(d) VI

Off-line converter, SMPS has
a. AC input and dc output
b .DC input and dc output
c. AC input and ac output
d. None

The amplitude of current of full wave rectified sinusoidal wave is 80 A, its average value will be
(a) 25.44A
(b) 80A
(c) 40A
(d) 56.56A

.Find the total current supplied to the lamp rated 100w .when supply voltage is 200 v.
(a) 1.75A
(b) 2A
(c) 0.5A
(d) 1A

The power factor of a inductive circuit is
(a) Lagging
(b) Leading
(c) Zero lagging
(d) Unity

. The power factor of a purely capacitive circuit is always
(a) Lagging
(b) Leading
(c) Unity
(d) Zero lagging

The overall circuit power factor of a RLC series circuit is found to be 0.898 lagging. The nature of the resultant circuit is
(a) Resistive
(b) Inductive
(c) Capacitive
(d) None of these

. is the property of electrical conductor which oppose the flow of current through it
(a) Reluctance
(b) emf
(c) mmf
(d) Resistance

. Reluctance is expressed in
(a) Ampere Weber
(b) Ohm
(c) Ampere/Weber
(d) Volt/Ampere

Reciprocal of reluctance is termed as
(a) Conductance
(b) Permenance
(c) Permeability
(d) None of these
Ohms law for electric circuit will be
(a) emf= current/resistance
(b) emf= current X resistance
(c) emf= resistance/current
(d) emf= 1/( resistance X current)

. The maximum, rms and average value of a periodic current wave form is 100 A, 64.42A and 57.5A, respectively. The peak factor of this wave is
(a) 0.644
(b) 1.552
(c) 1.12
(d) None of these

. In a parallel resistance circuit
(a) Power is same in all resistance
(b) Current is same in all resistance
(c) Voltage is same in all resistance
(d) Resistances are same

Find the total resistance when 2 Ohm and 4 Ohm resistances are in parallel.
(a) 1.33 Ohms
(b) 0.33 Ohms
(c) 2.33 Ohms
(d) 1 Ohm

. Expression for mmf in terms of field strength is
(a) HI
(b) H/I
(c) HL
(d) H/L

. is the property of magnetic which opposes the flow of flux through it.
(a) Resistance
(b) MMF
(c) Reluctance
(d) emf
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