Technical helper mains most question answer 2022
1. At a high value of slip, the torque of a three phase induction motor is _____.
A. Inversely proportional to slip
B. Zero
C. Unity
D. Directly proportional to slip
उच्च स्लिप के साथ 3 फेज प्रेरण मोटर का टॉर्क….
A. स्लिप के व्युत्क्रमानुपाती होता है
B. शून्य
C. इकाई
D. स्लिप के सीधे समानुपातिक
Ans A
2. Form factor for a sinusoidal wave is given by _____.
सिनुसोइडल वेव का आकृति गुणक कैसे दिया जाता है
A. 1.110
B. 1.414
C. 1.732
D. 1.5
A
3. Time constant of an RL circuit with R=2 Ω and L=10 H are given by ____.
10 हेनरी तथा 2 ओम प्रतिरोध के साथ RL सर्किट का समय स्थिरांक…
A. 2 sec
B. 5 sec
C. 10 sec
D. 3 sec
B
4. A single phase induction motor with single winding has ______.
Ans A. Zero starting torque
B. Unity stating torque
C. Very high starting torque
D. Very low starting torque
A
5. Full load regulation of four transformers with same power rating are 40%, 20%, 10% and
80% respectively. Which one should be recommended for obtaining better performance?
Ans A. 20%
B. 80%
C. 10%
D. 40%
A
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6. The maximum rate at which the amplifier output can change in an operational amplifier is
referred to as _____.
Ans A. Frequency rate
B. Signal rate
C. Slew rate
D. baud rate
C
7.Which of the following is used to prevent hunting in a synchronous machine?
Ans A. Field windings
B. Armature windings
C. Equalizer rings
D. Damper windings
D
8. In d.c. generators, armature reaction is produced by ____.
Ans A. Damper winding current
B. Field current
C. Interpole winding current
D. Armature current
D
9. The eddy current loss in an electrical machine is ____.
Ans A. Proportional to the square root of the frequency
B. Proportional to the square of the frequency
C. Independent of the frequency
D. Proportional to the frequency
B
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10.Average emf per turn in a transformer with standard notations is ______.
4¢f volt
11. Which is a active component? | एक सकिय घटक कौन सा है?
A Inductor | प्रारंभ करने वाला
B Resistor | रोकनेवािा
C Capacitor | संधाररत्र
D Transistor | ट्ांक्जस्टर
D
Rajasthan gk technical helper mains 2022 पुरूष स्त्रियों के वस्त्र एवं आभूषण
12. Which letter indicates the compound material
cadmium sulphide?
A A
B B
C C
D R
13. The second orbit of an atom contains 6 electrons. If it’s atomic mass is 17, then the number
of protons in it’s nucleus will be:
Ans A. 6
B. 8
C. 9
D. 17
B
14. A piece of gold has a resistance of 0.8 ohm. Find the resistance of a wire of the same size
and resistivity 25 times that of gold.
Ans A. 0.8 ohm
B. 20 ohm
C. 31.25 ohm
D. 0.032 ohm
B
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15. Two parallel conductors carrying current in the same direction:
Ans A. experiences no force
B. attract each other
C. repel each other
D. sometimes attract and sometime repel
B
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16. The direction of magnetic lines of force is:
Ans A. from N to S pole
B. not fixed
C. have no direction
D. from S to N pole
A
17. Which among the following has highest permeability?
Ans A. air
B. diamagnetic materials
C. ferromagnetic materials
D. paramagnetic materials
C
18. Curie temperature is the temperature at which the magnetic material:
Ans A. starts magnetizing
B. behaves like insulators
C. looses their magnetism
D. fully magnetized
C
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19. Germanium atom contains _____ valance electrons.
Ans A. 4
B. 6
C. 2
D. 8
A
20. The phenomenon of lagging of flux density behind the magnetizing force is called as:
Ans A. Mmf
B. relative permeability
C. magnetic leakage
D. magnetic hysteresis
D
21. Time constant of a capacitive circuit is defined as the time taken by the voltage to rise to
______ times final value of the voltage.
Ans A. 0.5
B. 2.0
C. 0.632
D. 0.368
C
22. The power consumed by a pure inductance connected to an AC circuit is:
Ans A. very high
B. very low
C. Zero
D. Infinite
C
23. A cable having 3 strands each of gauge 20 SWG may be represented as:
Ans A. 3-20
B. 20/3
C. 3/20
D. 3/20 mm
C
24. The arrow head in a transistor symbol points in the direction of:
Ans A. electron flow in the emitter region
B. majority carrier flow in emitter region
C. minority carrier flow in emitter region
D. holes flow in the emitter region
D
25. Pendant holders are used in domestic installation, when the lamp is to be:
Ans A. fixed at an angle
B. fixed on board
C. fixed on wall
D. suspended vertically
D