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Model Questions for SSC Junior Engineer EXAM - Electrical Engg set-1

1. If induction motor is direct switched-on then it will develop

(a) 2.5 times their full load torque
(b) 1.5 to 5 times their full load torque
(c) 1.5 times their full load torque
(d) 1.5 to 2.5 times their full load torque

2. The P - type semiconductor impurities are also called as

(a) Acceptor impurities
(b) Donor impurities
(c) Either (a) or (b)
(d) None of these

3. The overload release protects the motor against

(a) Over current
(b) Over load
(c) Over voltage
(d) All of these

4. In N - type semiconductor, the impurities added to a semiconductor are

(a) Monovalent
(b) Tetravalent
(c) Pentavalent
(d) Trivalent

5. 3 - point starter is used to start the

(a) Shunt motor
(b) Compound motor
(c) Series motor
(d) Only (b) and (c)

Study Kit for SSC Junior Engineer EXAM (Paper-1) 2017-2018

6. Impurities are generally added in the pure semiconductor to

(a) increase their conductivity
(b) increase the number of holes
(c) increase the number of electrons
(d) all of these

7. Filters are used to convert

(a) Pulsating dc signal into a pure dc signal
(b) Pulsating dc signal into a pure ac signal
(c) Pulsating ac signal into a pure dc signal
(d) Pure dc signal into a pulsating dc signal

8. In four - point starter, the no volt release is connected across the

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

9. In DOL fuses are provided to protect against

(a) Over load
(b) Short circuit protection
(c) Over current
(d) Over voltage

10. The cut - in voltage for silicon and germanium are

(a) 0.7 V, 0.7 V
(b) 0.7 V, 0.3 V
(c) 0.3 V, 0.3 V
(d) 0.3 V, 0.7 V