Basic Electrical Engineering Test - Set - 4

1)   Buzzer in principle is a bell

a. with hammer
b. with gong
c. with both hammer and gong
d. without hammer and gong
Answer  Explanation  Related Ques

ANSWER: without hammer and gong

Explanation:
No explanation is available for this question!


2)   In telegraphic machine, the machine parts that sends the message and the machine parts that receives the message are

a. Morse key, Morse key
b. Morse key, Morse sounder
c. Morse sounder, Morse key
d. Morse sounder, Morse sounder
Answer  Explanation  Related Ques

ANSWER: Morse key, Morse sounder

Explanation:
No explanation is available for this question!


3)   Electric heaters is made up of

a. Chromed iron
b. Brass
c. Steel
d. Both (a) and (b)
Answer  Explanation  Related Ques

ANSWER: Both (a) and (b)

Explanation:
No explanation is available for this question!


4)   Heating element of electric iron box is an alloy of

a. Copper and nickel
b. Nickel and cobalt
c. Iron and magnesium
d. Nickel and chromium
Answer  Explanation  Related Ques

ANSWER: Nickel and chromium

Explanation:
No explanation is available for this question!


5)   The handle of iron box is made up of

a. Bakelite
b. Ebonite
c. Chromium
d. Only (a) and (b)
Answer  Explanation  Related Ques

ANSWER: Only (a) and (b)

Explanation:
No explanation is available for this question!


6)   In leclanche cell, anode is packed in a porous pot containing

a. manganese dioxide
b. charcoal powder
c. sulphur dioxide
d. only (a) and (b)
Answer  Explanation  Related Ques

ANSWER: only (a) and (b)

Explanation:
No explanation is available for this question!


7)   The emf of the dry cell is about

a. 0 V
b. 0.5 V
c. 1 V
d. 1.5 V
Answer  Explanation  Related Ques

ANSWER: 1.5 V

Explanation:
No explanation is available for this question!


8)   In lead acid accumulators, the container is filled with distilled water and concentrated sulphuric acid in the ratio of

a. 1 : 2
b. 2 : 1
c. 3 : 1
d. 1 : 3
Answer  Explanation  Related Ques

ANSWER: 3 : 1

Explanation:
No explanation is available for this question!


9)   The positive plates of nickel iron cell is made up of

a. Nickel hydroxide
b. Lead peroxide
c. Ferrous hydroxide
d. Potassium hydroxide
Answer  Explanation  Related Ques

ANSWER: Nickel hydroxide

Explanation:
No explanation is available for this question!


10)   Lithium cells operates ranging from

a. -25 ° C to 25 ° C
b. -50 ° C to 25 ° C
c. -50 ° C to 75 ° C
d. -75 ° C to 75 ° C
Answer  Explanation  Related Ques

ANSWER: -50 ° C to 75 ° C

Explanation:
No explanation is available for this question!


11)   3 - point starter is used to start the

a. Series motor
b. Shunt motor
c. Compound motor
d. Only (b) and (c)
Answer  Explanation  Related Ques

ANSWER: Only (b) and (c)

Explanation:
No explanation is available for this question!


12)   The overload release protects the motor against

a. Over voltage
b. Over current
c. Over load
d. All of these
Answer  Explanation  Related Ques

ANSWER: Over load

Explanation:
No explanation is available for this question!


13)   In four - point starter, the no volt release is connected across the

a. Supply line through a protective resistance
b. In series with field circuit through a protective resistance
c. Either (a) or (b)
d. None of these
Answer  Explanation  Related Ques

ANSWER: Supply line through a protective resistance

Explanation:
No explanation is available for this question!


14)   In DOL fuses are provided to protect against

a. Short circuit protection
b. Over voltage
c. Over current
d. Over load
Answer  Explanation  Related Ques

ANSWER: Short circuit protection

Explanation:
No explanation is available for this question!


15)   If induction motor is direct switched-on then it will develop

a. 1.5 times their full load torque
b. 1.5 to 2.5 times their full load torque
c. 2.5 times their full load torque
d. 1.5 to 5 times their full load torque
Answer  Explanation  Related Ques

ANSWER: 1.5 to 2.5 times their full load torque

Explanation:
No explanation is available for this question!


16)   Impurities are generally added in the pure semiconductor to

a. increase the number of electrons
b. increase the number of holes
c. increase their conductivity
d. all of these
Answer  Explanation  Related Ques

ANSWER: increase their conductivity

Explanation:
No explanation is available for this question!


17)   In N - type semiconductor, the impurities added to a semiconductor are

a. Trivalent
b. Pentavalent
c. Monovalent
d. Tetravalent
Answer  Explanation  Related Ques

ANSWER: Pentavalent

Explanation:
No explanation is available for this question!


18)   The P - type semiconductor impurities are also called as

a. Acceptor impurities
b. Donor impurities
c. Either (a) or (b)
d. None of these
Answer  Explanation  Related Ques

ANSWER: Acceptor impurities

Explanation:
No explanation is available for this question!


19)   The cut - in voltage for silicon and germanium are

a. 0.3 V, 0.3 V
b. 0.3 V, 0.7 V
c. 0.7 V, 0.7 V
d. 0.7 V, 0.3 V
Answer  Explanation  Related Ques

ANSWER: 0.7 V, 0.3 V

Explanation:
No explanation is available for this question!


20)   Filters are used to convert

a. Pulsating dc signal into a pure dc signal
b. Pure dc signal into a pulsating dc signal
c. Pulsating dc signal into a pure ac signal
d. Pulsating ac signal into a pure dc signal
Answer  Explanation  Related Ques

ANSWER: Pulsating dc signal into a pure dc signal

Explanation:
No explanation is available for this question!