Ohm's Law Multiple choice Question (Electrical Mcqs) and Answer Part 8

                     Electrical Engineering Objective Question and Answer 



Q 141 to Q 142 refer to the data given below : 

 An electric circuit having passive element with instantaneous voltage three times the cube of instantaneous current through it.  

 141- If  I= 0.1 A , the power dissipated in passive element is  

        (A) 3 W

        (B) 0.3 W 

        (C) 3 x 12^-3 W  

        (D) 3 x 10^-4 W

       
Answer: (D)

    142- if i = 10 A, The power dissipated will be      


        (A) 3 W 

        (B) 30 W 

        (C) 3 kW  

        (D) 30 kW 

       
Answer: (D)

      143- if R = 30 Kilo ohm and i = 0.5 mA , the conductance will be    


        (A) 15 

        (B) 30000 

        (C) 3.33 x 10^-5  

        (D) 3.33^ x 10^-3

       
Answer: (C)

      144- The circuit has terminal voltage of     


        (A) 15 mV

        (B) 1.5 V

        (C) 15 V  

        (D) 150 V

       
Answer: (C)

 145- How many electrons contribute to make 1.6 x 10^-19 Columbus of charge ?    


        (A) one 

        (B) one million  

        (C) 6.2 x 10^18  

        (D) 1.6 x 10^-19

       
Answer: (C)

 146- The current at the terminal is given by 

   


For the time t = 1 sec and t = 2 sec , the charge flowing will be

        (A) 2.2 X 10^-6 C

        (B) 1.6 x10^ -6 C 

        (C) 0.6 x10^-8 C

        (D) 0.6 x 10^-10 C

       
Answer: (A)

     147- If  a electron moves from point A to point B and lose 1.6 x 10^-20 J energy. The potential at point B w.r.t A is 

        (A) -1 V

        (B) + 1 V 

        (C)  -0.1 V 

        (D)  +0.1 V

       
Answer: (C)

     148- A resistor has a resistance R as shown in the figure and if a same Resistor  of 0.2 millimeter by 0.2 millimeter has a resistance of 
    

        (A) 4 R

        (B) 2 R 

        (C) R  

        (D) R/2

       
Answer: (C)

      149- Certain substances show their resistance at very low temperature , These substances are called,    

        (A) dielectric 

        (B) super- conductors  

        (C) semi conductors   

        (D) perfect conductors 

       
Answer: (B)

    150- If the three resistances are connected in parallel /series , to obtain an equivalent resistance , how many values can be obtained by different combinations of these resistances.     

        (A) Three

        (B) Four 

        (C) Five   

        (D) Six

       
Answer: (B)

     151if R = 3 Kilo ohm and i = 0.3 mA , the conductance will be    

        (A) 30000 mho

        (B) 30 mho 

        (C) 0.33 milli mho  

        (D) 30 micro mho 

       
Answer: (C)

      152-

              



       
Answer: (C)

     153- An ohm meter reads an open resistor as 

        (A) Zero ohm 

        (B) high but with in tolerance 

        (C) low but not zero  

        (D) infinite 

       
Answer: (D)

     154if R = 1 Mega ohm , 2 W and current of 1 mA flows through it ,  the power dissipated  will be

        (A) 2 W

        (B) 1 W

        (C) 0.5 W 

        (D) 0.1 W

       
Answer: (B)

        155- The color code for a carbon resistor , if it is 10 Kilo ohm and have a tolerance of 20% 

        (A) Red , red , green and silver strips 

        (B) Yellow , violet, yellow and silver strips 

        (C) Orange , orange , black and Gold strips  

        (D) Brown , black , orange and no tolerance band 

       
Answer: (D)

        156- For a sophisticated design of an electric circuit , a resistor have to meet the following conditions 
       
         V = 5 V
         Current = 100 mA
         Safety factor for power dissipation : 2  

        (A) 5 ohm , 10 watt

        (B) 0.5 ohm , 100 watt

        (C) 5 ohm , 10 watt

        (D) 50 ohm , 1 watt

              Answer: (D)

 157- If R =  10 ohm , 10 W  , the resistor may be 

        (A) carbon resistor 

        (B) wire wound resistor 

        (C) either carbon or wire wound resistor  

        (D) neither carbon nor wire wound resistor 

       
Answer: (B)

 158- If  2 resistor having value of 10 kilo ohm and 5 W are connected in parallel , the power ratio will be 

        (A) 2.5 W

        (B) 5 W

        (C) 10 W 

        (D) 25 W

       
Answer: (C)
'
 159- Which of the following is typical resistance and power dissipation value for a wire wound resistance 

        (A) 1 Mega ohm , 1/3 W

        (B) 50 K ohm , 1/2 W

        (C) 500 ohm , 1 W

        (D) 10 ohm , 50 W

       
Answer: (D)

      160- A 100 kilo ohm resistor with a 1 watt power rating is likely to be a 

        (A) carbon resistor 

        (B) wire wound resistor 

        (C) either carbon or wire wound resistor  

        (D) neither carbon or wire wound resistor 

       
Answer: (A)









No comments: