RRB JE 2015-27-09-2015-3 RRB Question Paper

RRB JE 2015 Question Papers

RRB JE 2015-27-09-2015-3 RRB Questions

21.
The motor used in electrical shaving machines is
A.
Universal motor
B.
Shaded pole motor
C.
Capacitor motor
D.
Reluctance motor
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ANSWER :
A. Universal motor
22.
Economiser used in power plants is used to heat
A.
flue gases
B.
intake air
C.
steam
D.
feed water
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ANSWER :
D. feed water
23.
Which of the following is a high head turbine
A.
Propeller turbine
B.
Francis turbine
C.
Kaplan turbine
D.
Pelton wheel turbine
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ANSWER :
D. Pelton wheel turbine
24.
A 4 ohm resistor is connected in a circuit containing 4 V supply. The current drawn is
A.
8 A
B.
4 A
C.
1 A
D.
16 A
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ANSWER :
C. 1 A
25.
Which of the following rectifiers can withstand maximum voltage on DC side
A.
Mercury bulb rectifier
B.
Glass bulb rectifier
C.
Steel tank rectifier
D.
Varactor diode
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ANSWER :
C. Steel tank rectifier
26.
In an arc rectifier, the drop in voltage at the cathode is approximately
A.
1 volt
B.
6 to 7 volts
C.
60 to 70 volts
D.
1.2 to 7 volts
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ANSWER :
B. 6 to 7 volts
27.
Which one of the following converts sound waves into AF signals
A.
loudspeaker
B.
antenna
C.
rectifier
D.
microphone
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ANSWER :
D. microphone
28.
Which one of the following gives noiseless reception
A.
amplitude modulation
B.
phase modulation
C.
frequency modulation
D.
amplitude or phase modulation
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ANSWER :
C. frequency modulation
29.
The basic logic gate whose output is the complement of the input is
A.
OR gate
B.
AND gate
C.
INVERTER gate
D.
XOR gate
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ANSWER :
C. INVERTER gate
30.
The most commonly used semiconductor material is
A.
silicon
B.
carbon
C.
germanium
D.
phosphorus
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ANSWER :
A. silicon